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Penn State University
1.
Riley, Elliot Jay.
Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/16222 
► Radio direction finding systems estimate the \emph{direction-of-arrival} of electromagnetic signals. Direction finding systems have used many different processing algorithms since they were first investigated in…
(more)
▼ Radio
direction finding systems estimate the \emph{
direction-of-arrival} of electromagnetic signals.
Direction finding systems have used many different processing algorithms since they were first investigated in the beginning of the \begin{math} 20
th \end{math} century. The processing algorithm that is used to estimate the
direction-of-arrival of signals drives the choice of antenna or antenna array that must be used with the system. The antenna or antenna array then directly influences the available performance of the system. This thesis will focus on two planar antenna array designs for use with a correlation
direction finding algorithm. Correlation
direction finding algorithms require precise \emph{array manifold} data. Array manifold data are comprised of the individual complex antenna voltage response patterns of each element in the array. The voltage response patterns of each antenna element are measured over multiple azimuths, elevations, frequencies, and polarizations. The known array manifold data are then used to correlate incoming electromagnetic signals to find an estimate of the
direction-of-arrival. The array manifold must have unique response data for all azimuths of interest to produce unambiguous correlation results. This thesis investigates the use of two different mechanisms to produce uniqueness or diversity in array manifold data. One planar antenna array design utilizes equal spaced antenna elements with the elements providing different response patterns. The other design utilizes unequally spaced antenna elements with all the elements providing identical response patterns. The available performance of both antenna arrays for use with a correlation
direction finding algorithm is presented.
Advisors/Committee Members: Ram Mohan Narayanan, Thesis Advisor/Co-Advisor, Timothy Joseph Kane, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Direction Finding; Correlation Direction Finding; DF Antenna Arrays
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APA (6th Edition):
Riley, E. J. (2012). Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16222
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Riley, Elliot Jay. “Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms.” 2012. Thesis, Penn State University. Accessed February 28, 2021.
https://submit-etda.libraries.psu.edu/catalog/16222.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Riley, Elliot Jay. “Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms.” 2012. Web. 28 Feb 2021.
Vancouver:
Riley EJ. Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 28].
Available from: https://submit-etda.libraries.psu.edu/catalog/16222.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Riley EJ. Planar Antenna Arrays for Correlation Direction Finding Systems for use on Mobile Platforms. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16222
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
2.
Gerhard, William Edward III.
Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/92199
► Radio direction finding uses specialized radio equipment to determine the direction that a radio signal is coming from. Commercial systems are often expense, and existing…
(more)
▼ Radio
direction finding uses specialized radio equipment to determine the
direction that a radio signal is coming from. Commercial systems are often expense, and existing hobbyist designs require specialized skills, and both are not flexible in application or frequency. The same is true for commercially available drones, which tend to be expensive or face other limitations. In this work a low cost radio
direction finding system that uses easily found open source hardware and software was built and evaluated, along with a low cost unmanned aerial system. Then using the data collected, a computer algorithm was tested that could estimate the transmitting radio’s location. After testing it was determined that all systems did work, but still had room for improvement. Future steps and system modifications are presented that could improve the system’s performance.
Advisors/Committee Members: Tokekar, Pratap (committeechair), Wicks, Alfred L. (committee member), Baker, Joseph Benjamin (committee member).
Subjects/Keywords: Radio Direction Finding; Pseudo Doppler Direction Finding; UAS; Wildlife Tracking
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APA (6th Edition):
Gerhard, W. E. I. (2019). Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/92199
Chicago Manual of Style (16th Edition):
Gerhard, William Edward III. “Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS.” 2019. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/92199.
MLA Handbook (7th Edition):
Gerhard, William Edward III. “Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS.” 2019. Web. 28 Feb 2021.
Vancouver:
Gerhard WEI. Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/92199.
Council of Science Editors:
Gerhard WEI. Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/92199
University College London (University of London)
3.
Titze, Wolfram Albert Ulrich.
A study of symmetric-pair antenna arrays for direction finding and communications.
Degree: PhD, 1993, University College London (University of London)
URL: https://discovery.ucl.ac.uk/id/eprint/10099789/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320702
► A novel type of phased array, called a symmetric-pair array, is described. Its antenna elements are arranged in pairs around a common phase centre, which…
(more)
▼ A novel type of phased array, called a symmetric-pair array, is described. Its antenna elements are arranged in pairs around a common phase centre, which yields easy-to-process biphase output signals from each pair. Symmetric-pair arrays are attractive for applications such as direction finding and beam forming and, due to the nature of the pair output signals, it is also possible to achieve gain with isotropic coverage on reception. The properties of symmetric-pair arrays are examined, both for ideal conditions and in the presence of phase and amplitude errors. Graphical representations of the pair output signals are introduced to aid in the understanding of the properties of this type of antenna array. The necessary algorithms and techniques to perform unambiguous direction finding with symmetric-pairs are developed. A detailed outline of a symmetric-pair direction finding system is given, and different options to process its baseband signals are discussed. The performance of the direction finder in low signal-to-noise environments is analysed using the mathematics of random processes, and the probability of detection as a function of false-alarm rate and angle of arrival is evaluated. Beam forming techniques for symmetric-pair arrays are explained, and it is shown that this type of array allows savings in the control hardware due to its inherent symmetry. The problem of gain with isotropic coverage for reception is discussed, and it is demonstrated how it can be achieved with symmetric-pair arrays. Computer simulations and experimental results are used throughout the thesis to confirm and support the presented theory.
Subjects/Keywords: 629.045; Direction finding
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APA (6th Edition):
Titze, W. A. U. (1993). A study of symmetric-pair antenna arrays for direction finding and communications. (Doctoral Dissertation). University College London (University of London). Retrieved from https://discovery.ucl.ac.uk/id/eprint/10099789/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320702
Chicago Manual of Style (16th Edition):
Titze, Wolfram Albert Ulrich. “A study of symmetric-pair antenna arrays for direction finding and communications.” 1993. Doctoral Dissertation, University College London (University of London). Accessed February 28, 2021.
https://discovery.ucl.ac.uk/id/eprint/10099789/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320702.
MLA Handbook (7th Edition):
Titze, Wolfram Albert Ulrich. “A study of symmetric-pair antenna arrays for direction finding and communications.” 1993. Web. 28 Feb 2021.
Vancouver:
Titze WAU. A study of symmetric-pair antenna arrays for direction finding and communications. [Internet] [Doctoral dissertation]. University College London (University of London); 1993. [cited 2021 Feb 28].
Available from: https://discovery.ucl.ac.uk/id/eprint/10099789/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320702.
Council of Science Editors:
Titze WAU. A study of symmetric-pair antenna arrays for direction finding and communications. [Doctoral Dissertation]. University College London (University of London); 1993. Available from: https://discovery.ucl.ac.uk/id/eprint/10099789/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320702
University of Illinois – Chicago
4.
Manoochehri, Omid.
Wideband Reconfigurable Antenna Designs.
Degree: 2019, University of Illinois – Chicago
URL: http://hdl.handle.net/10027/23642
► We propose to study wideband reconfigurable lens antennas because these antennas are used in two main types of applications: (1) automotive radar systems and (2)…
(more)
▼ We propose to study wideband reconfigurable lens antennas because these antennas are used in two main types of applications: (1) automotive radar systems and (2)
direction finding radar systems. These antennas should be low profile, wideband and have capability to handle high RF power. Most the radar systems do not have enough space for their antennas therefore the main challenge for antenna designers is proposing small antenna. These antennas can be used also for satellite communications where all above requirements are not easily achieved.
Automotive radar systems typically operate in the microwave region or mm-wave region where lens structures are good candidates to be used for reconfigurable antennas. A good example is the Luneburg lens antenna. A Luneburg lens is fed by microstrip or horn antennas. The main challenge of Luneburg antennas are their size and fabrication process. Some authors proposed semi-spherical dielectric lens fed by microstrip antennas to reduce the size but microstrip antenna could not handle high power. Others used one-layer dielectric instead of multi dielectric layers to have easier fabrication process, but the total efficiency is not sufficient.
We have addressed some of these challenges in our preliminary results: low profile, wide band, capability to handle high RF power and minimum difficulty to fabricate. We designed and fabricated an ultra-wideband multibeam microwave lens antenna operating from 8 GHz to 18 GHz to cover X and Ku band for radar systems. The antenna consists of four excitation ports connected to a parallel plate waveguide filled with a cylindrical dielectric slab. We simplified the fabrication process by proposing a material with a uniform dielectric constant whose value is optimized to maximize gain performance while simplifying manufacturing process, instead of having an index of refraction that varies with the radial distance from the axis of the cylindrical lens. We addressed the capability to handle high RF power and reducing size by replacing the antenna feed with coaxial connector pins to reduce the overall size and increase the bandwidth compared to prior designs.
Many
direction finding systems typically have 8 to10 antennas placed along a circle and another one, the reference antenna, placed at its center. When a wave from an unknown
direction is incident on the system, its phase and amplitude are measured by all antennas along the circle and compared with the reference antenna to estimate the
direction of arrival of the signal. The reference antenna is omnidirectional and should have low ripple pattern in all directions to minimize the estimation error. Biconical antennas are good candidates as reference antennas, but the main challenge is designing wideband biconical antenna to receive both vertical and horizontal polarizations, since the polarization of the incident signal is unknown. To address the lack of knowledge about the polarization of the incident signal, some authors proposed the use of polarizers to rotate the polarization of the incident wave.…
Advisors/Committee Members: Erricolo, Danilo (advisor), Smida, Besma (committee member), Trivedi, Amit (committee member), Uslenghi, Piergiorgio L.E (committee member), Alexopoulos, Nicolaos G (committee member), Monticone, Francesco (committee member), Liang, Jing (committee member), Erricolo, Danilo (chair).
Subjects/Keywords: Reconfigurable antenna; UWB antenna; phase array antenna; direction finding
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APA (6th Edition):
Manoochehri, O. (2019). Wideband Reconfigurable Antenna Designs. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/23642
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Manoochehri, Omid. “Wideband Reconfigurable Antenna Designs.” 2019. Thesis, University of Illinois – Chicago. Accessed February 28, 2021.
http://hdl.handle.net/10027/23642.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Manoochehri, Omid. “Wideband Reconfigurable Antenna Designs.” 2019. Web. 28 Feb 2021.
Vancouver:
Manoochehri O. Wideband Reconfigurable Antenna Designs. [Internet] [Thesis]. University of Illinois – Chicago; 2019. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10027/23642.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Manoochehri O. Wideband Reconfigurable Antenna Designs. [Thesis]. University of Illinois – Chicago; 2019. Available from: http://hdl.handle.net/10027/23642
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Yao, Lichen (author).
Bluetooth Direction Finding.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:c07eb3a2-a303-4690-ac3e-e96f0064afcd
► In the next generation of Bluetooth standard, the Bluetooth SIG wants to incorporate multiple antenna systems into the Bluetooth Low Energy specification to enable direction-finding…
(more)
▼ In the next generation of Bluetooth standard, the Bluetooth SIG wants to incorporate multiple antenna systems into the Bluetooth Low Energy specification to enable
direction-
finding features. The features are aimed to improve the accuracy of off-the-shelf Asset Tracking Profile (ATP) and Indoor Positioning Service (IPS) including two modes – Angle-of-Arrival (AoA) mode and Angle-of-Departure (AoD) mode. In this thesis, we only focus on the AoA mode. The new standard raises several challenges. First, the
direction finding algorithm shall be derived sincethe standard gives only the framework. The algorithm shall cope with dense multipath effects in indoorenvironments and identify the angle of Line-of-Sight (LOS) component. Second, the new standard specifiesthe usage of an RF switch such that a single receiver can access multiple antennas. This mechanism reducesthe device cost and complexity but poses difficulties to the array processing. There are inevitably informationloss during antenna switching. It also raises requirements of channel stationarity and efficient compensationof CFO. Third, towards the system implementation, practical considerations that deviate the ideal datamodelshall be taken into account. These considerations include the effect of mutual coupling (MC), and the phase imbalance of the RF switch. During this project, these effects have been studied to obtain insight on theinfluence on algorithmperformance and compensation techniques. In this thesis, we formulated the data model for a single receiver using a uniformlinear multiple antennasystem with an RF switch. The importance of CFO compensation, channel stationarity, and the color of noiseare addressed. A maximum likelihood (ML) based CFO estimation algorithm is proposed. Furthermore, we modeled the effect of mutual coupling and imbalance of switch. Next, we analyzed why the delay estimation is not feasible within the context of Bluetooth LE. We proposed two Line-of-Sight
direction identification (LOS-Id) algorithms based on the power signature in the data covariance matrix, which are referred to as MUSIC LOS-Id and CLEAN-MUSIC LOS-Id. Further performance improvements are achieved by making use of the frequency hopping feature of Bluetooth. By aggregatingmore than one packets at different frequencies, the performance can be improved substantially. This technique is called the multi-tone technique, or packet aggregation (PA). For evaluating the effectiveness of the proposed methods and models, a Bluetooth LE simulator is built. The performance verification is divided into two phases that differentiate themselves by the channel model. In the first phase, a simulated channel model, which is obtained by applying the ray tracer in an empty rectangular room, is used. The mutual coupling effect is simulated using the Antenna Toolbox in Matlab. The switch characteristics are verified by measurements using a Vector Network Analyzer (VNA). In the second phase, the real channel is measured with the VNA. Three campaigns of…
Advisors/Committee Members: van der Veen, Alle-Jan (mentor), Dolmans, Guido (mentor), Janssen, Gerard (graduation committee), Romme, Jac (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Bluetooth Low Energy; Direction Finding; Antenna Switching; LOS Identification
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APA (6th Edition):
Yao, L. (. (2018). Bluetooth Direction Finding. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c07eb3a2-a303-4690-ac3e-e96f0064afcd
Chicago Manual of Style (16th Edition):
Yao, Lichen (author). “Bluetooth Direction Finding.” 2018. Masters Thesis, Delft University of Technology. Accessed February 28, 2021.
http://resolver.tudelft.nl/uuid:c07eb3a2-a303-4690-ac3e-e96f0064afcd.
MLA Handbook (7th Edition):
Yao, Lichen (author). “Bluetooth Direction Finding.” 2018. Web. 28 Feb 2021.
Vancouver:
Yao L(. Bluetooth Direction Finding. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 28].
Available from: http://resolver.tudelft.nl/uuid:c07eb3a2-a303-4690-ac3e-e96f0064afcd.
Council of Science Editors:
Yao L(. Bluetooth Direction Finding. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:c07eb3a2-a303-4690-ac3e-e96f0064afcd
Virginia Tech
6.
Yin, Xiaoyan.
The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions.
Degree: PhD, Mechanical Engineering, 2021, Virginia Tech
URL: http://hdl.handle.net/10919/101965
► Bats are well-known for their intricate biosonar system that allow the animals to navigate even the most complex natural environments. While the mechanism behind most…
(more)
▼ Bats are well-known for their intricate biosonar system that allow the animals to navigate even the most complex natural environments. While the mechanism behind most of these abilities remains unknown, an interesting observation is that some bat species produce fast movements of their ears when actively exploring their surroundings. By moving their pinna, the bats create a time-variant reception characteristic and very little research has been directed at exploring the potential benefits of such behavior so far. One hypothesis is that the speed of the pinna motions modulates the received biosonar echoes with Doppler-shift patterns that could convey sensory information that is useful for navigation. This dissertation intends to explore this hypothetical dynamic sensing mechanism by building a soft-robotic biomimetic receiver to replicate the dynamics of the bat pinna. The experiments with this biomimetic pinna robot demonstrate that the non-rigid ear motions produce Doppler signatures that contain information about the
direction of a sound source. However, these patterns are difficult to interpret because of their complexity. By combining the soft-robotic pinna with a convolutional neural network for processing the Doppler signatures in the time-frequency domain, I have been able to accurately estimate the source
direction with an error margin of less than one degree. This working system, composed of a soft-robotic biomimetic ear integrated with a deep neural net, demonstrates that the use of Doppler signatures as a source of sensory information is a viable hypothesis for explaining the sensory skills of bats.
Advisors/Committee Members: Mueller, Rolf (committeechair), Socha, John (committee member), Leonessa, Alexander (committee member), Abaid, Nicole Teresa (committee member), Roan, Michael J. (committee member).
Subjects/Keywords: Bats; Biosonar; Pinna Motions; Doppler Shifts; Direction finding; Biomimetics; Deep Learning
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APA (6th Edition):
Yin, X. (2021). The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/101965
Chicago Manual of Style (16th Edition):
Yin, Xiaoyan. “The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions.” 2021. Doctoral Dissertation, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/101965.
MLA Handbook (7th Edition):
Yin, Xiaoyan. “The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions.” 2021. Web. 28 Feb 2021.
Vancouver:
Yin X. The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions. [Internet] [Doctoral dissertation]. Virginia Tech; 2021. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/101965.
Council of Science Editors:
Yin X. The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions. [Doctoral Dissertation]. Virginia Tech; 2021. Available from: http://hdl.handle.net/10919/101965
University of Adelaide
7.
Ly, Peter Quoc Cuong.
Fast and unambiguous direction finding for digital radar intercept receivers.
Degree: 2013, University of Adelaide
URL: http://hdl.handle.net/2440/90332
► This thesis considers the problem of angle-of-arrival (AOA) estimation in the context of its application to electronic surveillance systems. Due to the operational requirements of…
(more)
▼ This thesis considers the problem of angle-of-arrival (AOA) estimation in the context of its application to electronic surveillance systems. Due to the operational requirements of such systems, the AOA estimation algorithm must be computationally fast, accurate and will need to be implemented using sparse, large aperture arrays. Interferometry is proposed as a suitable algorithm that meets the operational requirements of electronic surveillance systems. However, for sparse array geometries, phase wrapping effects introduce ambiguities to the phase measurements and so unambiguous AOA estimation requires the use of computationally intensive ambiguity resolution algorithms using three or more antennas. Beamforming and array processing techniques are another class of AOA estimation algorithms that can unambiguously estimate the AOA using sparse, large aperture arrays. While these techniques generally offer better AOA estimation performance than interferometric techniques, they are also comparatively more computationally intensive algorithms. Furthermore, by virtue of using very sparse arrays, high sidelobes in the array beampattern may cause incorrect AOA estimation. This thesis will introduce the concept of using second-order difference array (SODA) geometries which allow unambiguous AOA estimation to be performed in a computationally effcient manner. In the context of interferometry, the so-called “SODA interferometer" will be shown to synthesise the equivalent output of a smaller virtual aperture to allow unambiguous AOA estimation to be performed at the expense of a coarser estimation performance compared to the physical aperture of the array. It will also be shown that the coarse SODA AOA estimate can be used to cue the conventional ambiguity resolution algorithms to provide higher accuracy in a computationally efficient manner. This thesis will also show that the creation of virtual arrays from SODA geometries can be generalised to a larger number of antennas to allow conventional array processing techniques to perform unambiguous AOA estimation in a computationally fast manner. The AOA estimation performance of each algorithm is compared through simulations and also verified using experimental data. This thesis will show that the SODA interferometer, SODA-cued ambiguity resolution algorithms and so-called “second-order array processors" can be used to obtain high accuracy AOA estimates in a more computationally efficient manner than the conventional algorithms.
Advisors/Committee Members: Gray, Douglas Andrew (advisor), Bates, Bevan Douglas (advisor), Elton, Stephen Dennis (advisor), School of Electrical and Electronic Engineering (school).
Subjects/Keywords: direction finding; angle of arrival; AOA; direction of arrival; DOA; estimation; ambiguity resolution; second order difference array; SODA
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ly, P. Q. C. (2013). Fast and unambiguous direction finding for digital radar intercept receivers. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/90332
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ly, Peter Quoc Cuong. “Fast and unambiguous direction finding for digital radar intercept receivers.” 2013. Thesis, University of Adelaide. Accessed February 28, 2021.
http://hdl.handle.net/2440/90332.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ly, Peter Quoc Cuong. “Fast and unambiguous direction finding for digital radar intercept receivers.” 2013. Web. 28 Feb 2021.
Vancouver:
Ly PQC. Fast and unambiguous direction finding for digital radar intercept receivers. [Internet] [Thesis]. University of Adelaide; 2013. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2440/90332.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ly PQC. Fast and unambiguous direction finding for digital radar intercept receivers. [Thesis]. University of Adelaide; 2013. Available from: http://hdl.handle.net/2440/90332
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Emery, Brian.
Improved Methods for Oceanographic High Frequency Radars.
Degree: 2018, University of California – eScholarship, University of California
URL: http://www.escholarship.org/uc/item/8md6z1gs
► HF radars measure coastal ocean surface currents with a spatial and temporal resolution that remain unmatched by other approaches. Because they observe the scientifically and…
(more)
▼ HF radars measure coastal ocean surface currents with a spatial and temporal resolution that remain unmatched by other approaches. Because they observe the scientifically and economically important coastal zone, these radars often form an integral part of coastal ocean observing systems. Thus, improvements to the techniques they employ and the data they produce would have far reaching impacts.Several opportunities exist to improve HF radar data. First, idealized antenna pat- terns are widely used despite the fact that the most accurate observations are obtained when the radars use measured antenna patterns. Second, the radars produce maps of surface current velocities without estimates of the measurement uncertainties. Third, advances in signal processing techniques over the last few decades have not been evaluated for use with these radars.To simplify and automate the antenna pattern measurement (APM), a method is presented for obtaining antenna pattern measurements for HF radars from ships of op- portunity. Positions obtained from the Automatic Identification System (AIS) are used to identify signals backscattered from ships in ocean current radar data. The ship sig- nal and ship position data are then combined to determine the APM. Data screening methods are developed and shown to produce APMs with low error when compared with APMs obtained with standard approaches.To produce estimates of uncertainty in the surface current observations, a method toestimate uncertainty in the radar directional measurement [3] is identified and combinedwith previous results to produce an estimate of the uncertainty in the radial component observations produced by individual HF radars. The method is evaluated with radar simulations that incorporate complex ocean current scenarios. These simulations suggest processing modifications that inform the application to observational data. Uncertainty estimates are further evaluated using archive data from two operational HF radars. Results from these radars suggest that the uncertainty estimates can be used for data quality control, and would be suitable for incorporation into numerical models.Finally, an evaluation of alternative signal processing techniques suggests that significant improvements in spatial coverage are possible. Oceanographic HF radars typically employ Multiple Signal Classification (MUSIC) for direction of arrival (DOA) estimation. Signal processing literature suggests that several alternative DOA methods may provide advantages over MUSIC when applied to HF radars, which attempt to resolve complex and dynamic flows given poor signal conditions and constrained antenna designs. Results of radar simulations suggest that the Maximum Likelihood method produces improved spatial coverage at higher, though manageable, computational cost.These results imply improvements in the ocean current maps produced by HF radars in terms of more accurate maps, quantified uncertainty, and improved spatial coverage. Improved observations of near shore dynamics will benefit the many practical…
Subjects/Keywords: Ocean engineering; Remote sensing; Direction Finding; HF radar; ocean currents; signal processing
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APA (6th Edition):
Emery, B. (2018). Improved Methods for Oceanographic High Frequency Radars. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/8md6z1gs
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Emery, Brian. “Improved Methods for Oceanographic High Frequency Radars.” 2018. Thesis, University of California – eScholarship, University of California. Accessed February 28, 2021.
http://www.escholarship.org/uc/item/8md6z1gs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Emery, Brian. “Improved Methods for Oceanographic High Frequency Radars.” 2018. Web. 28 Feb 2021.
Vancouver:
Emery B. Improved Methods for Oceanographic High Frequency Radars. [Internet] [Thesis]. University of California – eScholarship, University of California; 2018. [cited 2021 Feb 28].
Available from: http://www.escholarship.org/uc/item/8md6z1gs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Emery B. Improved Methods for Oceanographic High Frequency Radars. [Thesis]. University of California – eScholarship, University of California; 2018. Available from: http://www.escholarship.org/uc/item/8md6z1gs
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
9.
Barnett, Adrienne Elise.
Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals.
Degree: PhD, 2014, Brunel University
URL: http://bura.brunel.ac.uk/handle/2438/8753
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607558
► This thesis explores the practices and perceptions of the courts and professionals in child contact proceedings where domestic violence is an issue and the implications…
(more)
▼ This thesis explores the practices and perceptions of the courts and professionals in child contact proceedings where domestic violence is an issue and the implications of this for mothers, with particular reference to Practice Direction 12J which establishes the framework for best practice to be followed in such proceedings. In-depth interviews were undertaken with 29 family lawyers and Cafcass officers covering a broad geographic and demographic area, and the reported cases to which the Practice Direction applies were reviewed. The resulting data were analysed utilising discourse analytic and qualitative approaches, drawing on a feminist poststructuralist approach and also insights from autopoietic theory. It was found that the ‘presumption of contact’ and an acontextual, legalistic approach to domestic violence reinforce each other and have a powerful normative influence on professional and judicial perceptions and practices. Dominant parental subjectivities of ‘implacably hostile mothers’ and ‘safe family men’ continue to resonate with many courts and professionals, who focus on promoting contact rather than safeguarding mothers and children. Despite more judges and professionals gaining a broader understanding of the coercively controlling nature of domestic violence, only recent, very severe physical violence warrants the holding of fact-finding hearings on disputed allegations and provides sufficiently ‘cogent’ reasons for family lawyers to support mothers in opposing contact and for courts to refuse contact. The notion that domestic violence is morally reprehensible and a significant failure in parenting, and that women’s desires for safety, wellbeing and autonomy are morally legitimate, finds very little expression. This study concludes that in order to regain a valid and authoritative voice for women in current family law we need to expose and disrupt law’s construction of the ‘scientific truth’ about children’s welfare, the dominant parental subjectivities to which it gives rise, and the ‘safe haven’ of law’s ideal post-separation family.
Subjects/Keywords: 362.76; Child contact; Domestic violence; Practice direction 12J; Fact-finding hearings; Welfare of the child
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APA (6th Edition):
Barnett, A. E. (2014). Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/8753 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607558
Chicago Manual of Style (16th Edition):
Barnett, Adrienne Elise. “Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals.” 2014. Doctoral Dissertation, Brunel University. Accessed February 28, 2021.
http://bura.brunel.ac.uk/handle/2438/8753 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607558.
MLA Handbook (7th Edition):
Barnett, Adrienne Elise. “Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals.” 2014. Web. 28 Feb 2021.
Vancouver:
Barnett AE. Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals. [Internet] [Doctoral dissertation]. Brunel University; 2014. [cited 2021 Feb 28].
Available from: http://bura.brunel.ac.uk/handle/2438/8753 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607558.
Council of Science Editors:
Barnett AE. Contact at all costs? : domestic violence child contact and the practices of the family courts and professionals. [Doctoral Dissertation]. Brunel University; 2014. Available from: http://bura.brunel.ac.uk/handle/2438/8753 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607558
KTH
10.
Franzén, Fernando.
Direction Finding : Determine the direction to a transmitter with randomly placed sensors.
Degree: Electrical Engineering and Computer Science (EECS), 2019, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253204
► There are a lot of stand-alone and mobile platforms using transmitters today. Some want to be found while others do not. In our modern…
(more)
▼ There are a lot of stand-alone and mobile platforms using transmitters today. Some want to be found while others do not. In our modern society there is a great demand of mobility and communication abilities. This means that several mobile platforms could potentially carry a sensor to record incoming signals to be used in Direction Finding. This thesis identifies the possibility to determine the direction to a transmitter with randomly placed sensors. By conducting a literature review well-known methods such as Time Difference Of Arrival (TDOA) and MUltiple SIgnal Classification (MUSIC) where chosen as methods in this analysis. The methods are applied on two antenna arrays, an Uniform Circular Array (UCA) and a Random Circular Array (RCA). The RCA is generated with randomly placed sensors. The performance in the Direction Of Arrival (DOA) is investigated in presence of time synchronization error and with different numbers of elements, radius and Signal to Noise Ratio (SNR). The ambiguity in the arrays is also investigated to insure a ambiguity-free DOA estimation. The results from this analysis identifies that the accuracy in the DOA estimation is dependent on the number of elements, SNR, the elements positions and the radius of the DF array. Furthermore, the accuracy of a UCA is greater than a RCA when the elements are randomly distributed within the area of a circle with radius R. Finally, it has shown that if time synchronization error occurs between the sensors, then the MUSIC method the accuracy will decrease greatly.
Det finns många individer och mobila platformar som använder sändare idag. Vissa vill bli hittade, andra inte. I vårat moderna samhälle är det en stor efterfrågan på rörlighet och kommunikationsmöjligheter. Detta innebär att många mobila plattformar skulle kunna spela in signaler för att användas i radiopejling. Denna uppsats identifierar möjligheten att bestämma riktningen till en sändare med slumpmässigt placerade sensorer. Genom litteraturstudien identifierades de välkända riktningsmetoder som Time Difference Of Arrivial (TDOA) och MUltiple SIgnal Classification (MUSIC) som vidare valdes som metoder i denna analys. Två antennstrukturer används i analyserna. Den ena är en Uniform Circular Array (UCA) och den andra är en Random Circular Array (RCA). RCA är genererad med slumpmässigt utplacerade sensorer. Prestandan i riktningsuppskattningen undersöks när det existerar ett tidssynkroniseringsfel, olika antal sensorer i antennstrukturerna, varierande radier och olika signaloch brusförhållanden.Ä ventvetydigheter undersöks i strukturerna för att säkerställa att en entydig riktningsbestämning kan utföras. Resultaten implicerar att noggrannheten i riktningsbestämningen är beroende avantalet element, SNR, elementens position och radien i antennmatrisen. Utöver detta visar resultaten att en UCA har högre noggrannhet än en RCA då elementen är slumpmässigt utplacerade inom en cirkelradie, R. Slutligen, om tidssynkroniseringsfel uppstår mellan sensorerna kommer detta…
Subjects/Keywords: Direction Finding; TDOA; MUSIC; UCA; Random Array; DOA; Engineering and Technology; Teknik och teknologier
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APA ·
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APA (6th Edition):
Franzén, F. (2019). Direction Finding : Determine the direction to a transmitter with randomly placed sensors. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Franzén, Fernando. “Direction Finding : Determine the direction to a transmitter with randomly placed sensors.” 2019. Thesis, KTH. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Franzén, Fernando. “Direction Finding : Determine the direction to a transmitter with randomly placed sensors.” 2019. Web. 28 Feb 2021.
Vancouver:
Franzén F. Direction Finding : Determine the direction to a transmitter with randomly placed sensors. [Internet] [Thesis]. KTH; 2019. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Franzén F. Direction Finding : Determine the direction to a transmitter with randomly placed sensors. [Thesis]. KTH; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
11.
Garrido Lopez, David.
Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications.
Degree: PhD, Electrical, Computer & Energy Engineering, 2016, University of Colorado
URL: https://scholar.colorado.edu/eeng_gradetds/25
► This thesis introduces several novel antenna systems with extended performance capabilities achieved by either enabling multiple operation bands or by widening the bandwidth. Proposed…
(more)
▼ This thesis introduces several novel antenna systems with extended performance capabilities achieved by either enabling multiple operation bands or by widening the bandwidth. Proposed theoretical concepts are successfully tested through simulations and experiments with excellent agreement are demonstrated. The designs developed in this thesis research are low-profile or flush mountable, enabling simple platform integration.
In the HF/VHF bands, the development of a novel low-profile multiband antenna for vehicular applications is presented. Specifically, an inverted-F antenna is used as a driven element, to operate at the lowest frequency of 27 MHz, whereas two parasitic elements are built as inverted-L monopoles to enable resonances at 49 and 53 MHz. To eliminate the need for an external matching network, an offset feeding technique is used. When the antenna is mounted on a vehicle and bent to follow its profile, a very low-profile is achieved (λ/44) while good impedance and far-field performance are maintained across all three bands. The developed antenna system is not only electrically smallest among others found in the literature, but it is easily modified for other band selections and tuning of each band can be readily achieved.
Vehicular antennas are often used for high power applications, which may cause exposure of nearby individuals to possibly dangerous electromagnetic fields. To assess this hazard, the RF exposure of a vehicle's crew is discussed and an original and fast modeling approach for prediction thereof is demonstrated. The modeling approach is based on eigenmode analysis for acquiring a range of frequencies where the shielding effectiveness of a vehicle cabin is expected to be lower than average. This approach is typically much faster and requires less computational resources as compared to classical full-wave analyses. This analysis also shows that the position of an antenna system is critical and must be considered when high-power RF emissions are planned.
Following the same trend of antenna system size reduction with extension of capabilities in a congested spectral environment, the millimeter wave spectrum is explored next. Specifically, antenna systems for wideband amplitude only (AO)
direction finding (DF) are thoroughly considered. Theory and design considerations are developed to fill gaps in open literature. Typical sources of errors are theoretically analyzed, and a discussion on limitations and advantages of different AO DF architectures is given.
Practical millimeter wave realizations of AO DF antenna front-ends in the K/Ka/Q bands (18-45 GHz) are developed using two different architectures: a passive phased-array and a squinted antenna system. For the former, a tightly coupled two-element tapered slot antenna (TSA) array with a stacked arrangement is developed. A novel enclosure of the array inside an absorbing cavity is proposed and improved system performance with flush mounted configuration is demonstrated. The squinted antenna system avoids the use…
Advisors/Committee Members: Dejan Filipovic, Gregor Lasser, Dejan Filipovic, Zoya Popovic, Frank Barnes.
Subjects/Keywords: Direction Finding; Exposure; Low-Profile Antennas; Millimeter Waves; Multiband Antennas; Wideband Antennas; Electrical and Computer Engineering; Electromagnetics and Photonics
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APA (6th Edition):
Garrido Lopez, D. (2016). Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/eeng_gradetds/25
Chicago Manual of Style (16th Edition):
Garrido Lopez, David. “Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications.” 2016. Doctoral Dissertation, University of Colorado. Accessed February 28, 2021.
https://scholar.colorado.edu/eeng_gradetds/25.
MLA Handbook (7th Edition):
Garrido Lopez, David. “Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications.” 2016. Web. 28 Feb 2021.
Vancouver:
Garrido Lopez D. Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2021 Feb 28].
Available from: https://scholar.colorado.edu/eeng_gradetds/25.
Council of Science Editors:
Garrido Lopez D. Low-Profile Multiband and Flush-Mountable Wideband Antennas for Hf/vhf and K/ka Band Applications. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/eeng_gradetds/25
Grand Valley State University
12.
Karki, Anup.
Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking.
Degree: 2019, Grand Valley State University
URL: https://scholarworks.gvsu.edu/theses/968
► Radio Direction Finding (RDF) is commonly used for low cost tracking and navigation systems. However, for a low cost application and mobility, the design constraints…
(more)
▼ Radio Direction Finding (RDF) is commonly used for low cost tracking and navigation systems. However, for a low cost application and mobility, the design constraints are highly limited. Pseudo Doppler (PD) can improve RDF capabilities without being cost prohibitive. This work entails the analysis of PD RDF and its potential use for Unmanned Aerial Vehicles (UAV) that are currently employed in wildlife research animal tracking. PD is based on the doppler effect or doppler shift. The doppler effect works like a frequency modulator that increases or decreases the observed frequency depending on whether a signal source is approaching or receding the detector. Noting this doppler shift can be used to improve the accuracy of the RDF algorithm. Normally, deploying the doppler method would require the physical rotation of an antenna at a relatively high frequency. Instead, PD employs a grid of electrically isolated antennas and then digitally samples each of the antennas in a sequential order, mimicking the action of mechanical rotation. Thus, PD removes the requirement to physically rotate the antenna yet provides the increased accuracy available with sensing the doppler effect.
PD can be implemented at low cost using an off-the-shelf Software Defined Radio (SDR) and simple monopole antennas. This work includes the design and implementation of a PD RDF on an SDR for deployment on an existing UAV platform. The expected improved performance of the PD system is to be tested on the existing UAV platform and compared against traditional tracking methods (such as a single Yagi antenna).
Subjects/Keywords: Pseudo-Doppler; Radio Direction Finding; Software defined Radio; Engineering; Navigation, Guidance, Control, and Dynamics; Signal Processing
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APA (6th Edition):
Karki, A. (2019). Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking. (Thesis). Grand Valley State University. Retrieved from https://scholarworks.gvsu.edu/theses/968
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karki, Anup. “Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking.” 2019. Thesis, Grand Valley State University. Accessed February 28, 2021.
https://scholarworks.gvsu.edu/theses/968.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karki, Anup. “Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking.” 2019. Web. 28 Feb 2021.
Vancouver:
Karki A. Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking. [Internet] [Thesis]. Grand Valley State University; 2019. [cited 2021 Feb 28].
Available from: https://scholarworks.gvsu.edu/theses/968.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karki A. Radio direction finding using pseudo-Doppler for UAV-based Animal Tracking. [Thesis]. Grand Valley State University; 2019. Available from: https://scholarworks.gvsu.edu/theses/968
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
13.
Harter, Nathan M.
Development of a Single-Channel Direction Finding Algorithm.
Degree: MS, Electrical and Computer Engineering, 2007, Virginia Tech
URL: http://hdl.handle.net/10919/31973
► A radio direction finding (DF) system uses a multiple-element antenna array coupled with one or more receivers to estimate the direction-of-arrival (DOA) of a targeted…
(more)
▼ A radio
direction finding (DF) system uses a multiple-element antenna array coupled with one or more receivers to estimate the
direction-of-arrival (DOA) of a targeted emitter using characteristics of the signal received at each of the antennas in the array. In general, DF systems can be classified both by the number of receivers employed as well as which characteristics of the received signal are used to produce the DOA estimate, such as the signal's amplitude, phase, or time of arrival.
This work centers on the development and implementation of a novel single-channel
direction finding system based on the differential phase of the target signal received by a uniform circular antenna array with a commutative switch. The algorithm is called the PLL DF Method and differs from older single-channel DF techniques in that it is a digital algorithm intended for implementation on a software-defined radio (SDR) platform with a custom-designed antenna array and RF switching network. It uses a bank of parallel software PLLs to estimate the phase of the signal received at each element of the multi-antenna array. Theses estimated phase values are then fed to a specialized signal processing block that estimates the DOA of the received signal.
This thesis presents the details of the initial version of the PLL algorithm which was used to produce a proof-of-concept system with an eight-element circular array. It then discusses various technical challenges uncovered in the initial implementation and presents numerous enhancements to the algorithm to overcome these challenges, such as a modification to the PLL model to offer increased estimator robustness in the presence of a frequency offset between the transmitter and receiver, revisions of the software implementation to reduce the algorithm's processing requirements, and the adaptation of the DF algorithm for use with a 16-element circular array. The performance of the algorithm with these modifications under various conditions are simulated to investigate their impact on the DOA estimation process and the results of their implementation on an SDR are considered.
Advisors/Committee Members: Buehrer, R. Michael (committeechair), Reed, Jeffrey Hugh (committee member), Tranter, William H. (committee member).
Subjects/Keywords: Beamforming; Signal Processing; Direction Finding; Wireless Communications
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APA (6th Edition):
Harter, N. M. (2007). Development of a Single-Channel Direction Finding Algorithm. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31973
Chicago Manual of Style (16th Edition):
Harter, Nathan M. “Development of a Single-Channel Direction Finding Algorithm.” 2007. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/31973.
MLA Handbook (7th Edition):
Harter, Nathan M. “Development of a Single-Channel Direction Finding Algorithm.” 2007. Web. 28 Feb 2021.
Vancouver:
Harter NM. Development of a Single-Channel Direction Finding Algorithm. [Internet] [Masters thesis]. Virginia Tech; 2007. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/31973.
Council of Science Editors:
Harter NM. Development of a Single-Channel Direction Finding Algorithm. [Masters Thesis]. Virginia Tech; 2007. Available from: http://hdl.handle.net/10919/31973
Michigan Technological University
14.
Gawron, Evan.
ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR.
Degree: MS, Department of Electrical and Computer Engineering, 2019, Michigan Technological University
URL: https://digitalcommons.mtu.edu/etdr/873
► Passive phased antenna arrays are utilized in military and civilian radar systems to determine the received signal origination. Phased array placement for optimal reception…
(more)
▼ Passive phased antenna arrays are utilized in military and civilian radar systems to determine the received signal origination. Phased array placement for optimal reception is challenging due to the required supporting electronic hardware and the associated coaxial cabling that typically accompanies each antenna channel. Low noise amplifiers and frequency conversion hardware add size and complexity, limiting possible positions for phased array placement. Eliminating required phased array electronic subcomponents without sacrificing function would allow placement onto smaller agile platforms, such as unmanned systems and rapid deployment networks. Electro-optic (EO) antenna elements utilize an optical waveguide embedded between the antenna and ground plane that responds to the electric field received by the resonating antenna. Using EO antenna elements removes associated electronic hardware from antenna sites, thus simplifying advanced phased array technology. EO antenna elements modulate received signals directly into the optical domain where the low loss, electromagnetic immunity, low weight, and small size advantages of optical fiber can be utilized for antenna remoting. The combination of optical signals from EO antenna elements in Mach-Zehnder interferometers reduces the number of overall channels needed for a given radar system. The reduction of channels further serves to decrease the size, weight, cost, computation, and power requirements of the radar system.
This thesis details the design, fabrication, and characterization of EO phased arrays and prototype EO antenna elements, both as individual antenna elements and in a phased array configuration. Waveguide loss, refractive index, and EO coefficient measurements are made for individual EO antenna elements. Radio Frequency (RF) phase modulation emulating a changing angle of arrival is applied by direct injection to a two-element phased array of EO antenna elements. The system’s optical output is correlated to the array factor for a two-element phased array showing proof-of-concept that EO antenna elements can be used in
direction finding applications. The sensitivity of EO antenna elements is analyzed and a new design for EO antenna elements with improved sensitivity is presented. The electric field distribution of a rectangular patch antenna at resonance was found to be useful for driving a push-pull Mach-Zehnder modulator, doubling the EO antenna element sensitivity.
Advisors/Committee Members: Christopher Middlebrook.
Subjects/Keywords: electro-optic antenna; phased array; direction finding; electro-optic polymer; optical waveguide; patch antenna; Electromagnetics and Photonics
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APA (6th Edition):
Gawron, E. (2019). ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/873
Chicago Manual of Style (16th Edition):
Gawron, Evan. “ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR.” 2019. Masters Thesis, Michigan Technological University. Accessed February 28, 2021.
https://digitalcommons.mtu.edu/etdr/873.
MLA Handbook (7th Edition):
Gawron, Evan. “ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR.” 2019. Web. 28 Feb 2021.
Vancouver:
Gawron E. ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR. [Internet] [Masters thesis]. Michigan Technological University; 2019. [cited 2021 Feb 28].
Available from: https://digitalcommons.mtu.edu/etdr/873.
Council of Science Editors:
Gawron E. ELECTRO-OPTIC ANTENNA ELEMENTS FOR PASSIVE PHASED ARRAY RADAR. [Masters Thesis]. Michigan Technological University; 2019. Available from: https://digitalcommons.mtu.edu/etdr/873
Brno University of Technology
15.
Predajňa, Martin.
Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands.
Degree: 2018, Brno University of Technology
URL: http://hdl.handle.net/11012/7148
► Diploma thesis describes direction finding principles for passive localization of emitting source. Direction finding system with one rotating antenna was chosen with triangulation calculation of…
(more)
▼ Diploma thesis describes
direction finding principles for passive localization of emitting source.
Direction finding system with one rotating antenna was chosen with triangulation calculation of emitter position. Input parameters are position of measurement point and
direction of maximum signal receiving level. A suitable digital compass module and GPS receiver module for this measurement was chosen. For this purpose was created a graphic user interface, which allow user to communicate with external devices and control spectrum analyzer. Results of measurements are displayed at map, together with area of possible positions of transmitter. Receiving Yagi antenna is placed on rotator and whole system is placed on roof of car. Whole system was construct and results of measurement are discuss here.
Advisors/Committee Members: Hanus, Stanislav (advisor), Nováček, Zdeněk (referee).
Subjects/Keywords: lokalizácia; triangulácia; GPS; lokalizačné techniky; rádiové rušenie; spektrálny analyzátor; direction finding; localization techniques; interference measurement; GPS; digital compass
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APA (6th Edition):
Predajňa, M. (2018). Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/7148
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Predajňa, Martin. “Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands.” 2018. Thesis, Brno University of Technology. Accessed February 28, 2021.
http://hdl.handle.net/11012/7148.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Predajňa, Martin. “Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands.” 2018. Web. 28 Feb 2021.
Vancouver:
Predajňa M. Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/11012/7148.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Predajňa M. Lokalizátor interferencí pro kmitočtová pásma EGSM a UMTS: Interference locator for EGSM and UMTS frequency bands. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/7148
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Wright State University
16.
Glass, Douglas J.
INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS.
Degree: MSEgr, Electrical Engineering, 2007, Wright State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1183437465
► A four-arm spiral antenna offers broadband frequency response, wide beamwidths, reduced size compared to other antenna designs, and the ability to determine the relative direction…
(more)
▼ A four-arm spiral antenna offers broadband frequency
response, wide beamwidths, reduced size compared to other antenna
designs, and the ability to determine the relative
direction of an
incident signal with appropriate mode-forming. The reduced overall
area projection of the four-arm spiral antenna compared to other
antenna designs and the ability to be manufactured in a planar
format allows the antenna to reside within an Unmanned Air Vehicle
(UAV) fuselage. This thesis investigates the effects of
cylindrically-conforming two different designs of a four-arm spiral
antenna to reside within the fuselage of a medium-sized UAV.
Theoretical predictions of antenna performance were created using
the Numerical Electromagnetics Code (NEC) package and compared to
measured results of flat and cylindrically-conformed four-arm
spiral antennas with and without ground plane
apertures.
Advisors/Committee Members: Riechers, Ronald (Advisor).
Subjects/Keywords: Spiral Antenna; Mode-Former; Cylindrically-Conformed; Direction-Finding
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APA (6th Edition):
Glass, D. J. (2007). INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1183437465
Chicago Manual of Style (16th Edition):
Glass, Douglas J. “INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS.” 2007. Masters Thesis, Wright State University. Accessed February 28, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1183437465.
MLA Handbook (7th Edition):
Glass, Douglas J. “INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS.” 2007. Web. 28 Feb 2021.
Vancouver:
Glass DJ. INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS. [Internet] [Masters thesis]. Wright State University; 2007. [cited 2021 Feb 28].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1183437465.
Council of Science Editors:
Glass DJ. INVESTIGATION OF CYLINDRICALLY-CONFORMED FOUR-ARM SPIRAL
ANTENNAS. [Masters Thesis]. Wright State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1183437465
University of Dayton
17.
Labarowski, Daniel Douglas.
Wireless Personnel Tracking in Confined Quarters.
Degree: MS(M.S.), Electrical and Computer Engineering, 2017, University of Dayton
URL: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493154966443995
► A variety of industrial, public service, and government occupations would benefit from a personnel tracking system capable of precisely tracking personnel working mixed indoor /…
(more)
▼ A variety of industrial, public service, and
government occupations would benefit from a personnel tracking
system capable of precisely tracking personnel working mixed indoor
/ outdoor worksites. Such a system would increase the safety and
efficiency of personnel working these sites, especially in the case
of critical operations such as public service. No currently
available systems fit the needs of this application. A field
deployable system is defined herein that specifically addresses the
needs of tracking personnel working small area indoor / outdoor
environments.The Theseus tracking system is a two part system
composed of a ground station deployed at a work site and one or
more Radio-Frequency Identification (RFID) beacons deployed with
personnel assigned to the work site. The ground station emits a
Frequency-Modulated Continuous-Wave (FMCW) pulse that the beacons
echo and return to the ground station. The ground station uses
tracking / radar algorithms to discern the distance and
direction
to the RFID beacon. For a finalized system, elevation tracking
would be included as well. Particular focus is given to the RFID
beacon as the researcher’s efforts were directed predominately at
this device. The RFID beacon is a bent-pipe transceiver, meaning
that any signal received is re-transmitted at a slightly different
frequency. The RFID beacon has evolved several times during the
duration of this project due to system level changes, and in its
current form it transmits and receives within a narrow band between
420 and 450 MHz that the Federal Communications Commission (FCC)
has allocated to tracking systems. The narrow gap between transmit
and receive frequencies has placed taxing requirements on the
filtering used in the RFID beacon. A Surface-Skimming Bulk Wave
(SSBW) filter was specified to meet the tight requirements of the
RFID beacon, but was not procurable for the proof of concept. In
the place of these filters, the proof of concept incorporates an
Intermediate-Frequency (IF) filtering scheme as well as
accommodations to add manually tuned coaxial cable filtering.
Potential antennas, enclosures, and power sources are also
discussed.Remaining efforts to validate the system have been
identified. Future work that could make this system cheaper as well
as more robust and reliable has been identified. These efforts
range from simplifying the RFID beacon and trimming its production
costs to expanding the functionality of the RFID beacon and
potentially integrating the beacon with existing communication
equipment using intelligent Software Defined Radio (SDR) systems.
The current Theseus system provides a solution to tracking
personnel working small area indoor / outdoor work sites not
currently rivalled by existing products. Additional research should
be considered that may produce more robust solutions.
Advisors/Committee Members: Wicks, Michael (Committee Chair).
Subjects/Keywords: Electrical Engineering; Engineering; wireless; personnel; tracking; confined; quarters; radar; RFID; direction finding; Theseus; beacon; ground station; system
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APA (6th Edition):
Labarowski, D. D. (2017). Wireless Personnel Tracking in Confined Quarters. (Masters Thesis). University of Dayton. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493154966443995
Chicago Manual of Style (16th Edition):
Labarowski, Daniel Douglas. “Wireless Personnel Tracking in Confined Quarters.” 2017. Masters Thesis, University of Dayton. Accessed February 28, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493154966443995.
MLA Handbook (7th Edition):
Labarowski, Daniel Douglas. “Wireless Personnel Tracking in Confined Quarters.” 2017. Web. 28 Feb 2021.
Vancouver:
Labarowski DD. Wireless Personnel Tracking in Confined Quarters. [Internet] [Masters thesis]. University of Dayton; 2017. [cited 2021 Feb 28].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493154966443995.
Council of Science Editors:
Labarowski DD. Wireless Personnel Tracking in Confined Quarters. [Masters Thesis]. University of Dayton; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493154966443995
Pontifical Catholic University of Rio de Janeiro
18.
SILVIO FERNANDO BERNARDES PINTO.
[en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE.
Degree: 2018, Pontifical Catholic University of Rio de Janeiro
URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34917
► [pt] A maioria dos métodos e algoritmos para estimação de direção é pouco precisa em cenários formados por fontes próximas, pequenos lotes de amostras e…
(more)
▼ [pt] A maioria dos métodos e algoritmos para estimação
de direção é pouco precisa em cenários formados por fontes
próximas, pequenos lotes de amostras e sinais correlatados. Nos
últimos anos, alguns métodos para superar tais óbices utilizaram
conhecimento prévio de direções de sinais oriundos de usuários
estáticos. Porém, este conceito está limitado a direções de chegada
conhecidas. Esta tese apresenta várias contribuições para superar
os problemas mencionados anteriormente. Introduz-se um novo
conceito de conhecimento a priori aplicado à estimação de direção,
substituindo-se as tradicionais direções de chegada disponíveis por
estimativas preliminares obtidas on-line. Tal ideia é incorporada
aos algoritmos propostos e suas extensões. Também é introduzido um
conceito para a estimação da matriz de covariância de dados
reduzindo-se iterativamente os seus subprodutos que ocorrem na
região finita de amostras. Esta abordagem é complementada por uma
análise da matriz de covariância modificada, que mostra que, após a
primeira iteração, o Mean Squared Error (MSE) da matriz de
covariância de dados livre desses subprodutos é menor ou igual ao
MSE da matriz de covariância de dados original. Combinando-se os
dois conceitos anteriormente descritos, obtém-se um novo método
denominado Multi-Step Knowledge-Aided Iterative (MS-KAI) que eleva
a precisão de algoritmos existentes. Inicialmente, o método MS-KAI
é usado com Uniform linear Arrays (ULAs) e é combinado com o
algoritmo Estimation of Signal Parameters via Rotational Invariance
Techniques, resultando no algoritmo proposto MS-KAI-ESPRIT. O
método é então ampliado para uso com um número arbitrário de
iterações e combinado com o algoritmo Gradiente Conjugado,
resultando no algoritmo MS-KAI-CG. Finalmente, ele é usado com
arranjos aninhados e combinado com o algoritmo Multiple Signal
Classification, resultando no algoritmo proposto MS-KAI-MUSIC.
Simulações mostram que o método MS-KAI eleva a precisão de
algoritmos baseados em subespaços, empregando modelos de sinais
baseados em ULAs e non-ULAs.
[en] Most conventional methods and algorithms for
direction finding suffer from poor accuracy when subjected to
scenarios characterized by closely spaced sources, short data
records and correlated source signals. In the last few years, some
approaches to overcoming these problems have exploited prior
knowledge of signal directions coming from static users. However,
this concept is restricted to known directions of arrival. This
thesis presents several contributions to dealing with the
aforementioned problems. A novel concept of a priori knowledge
applied to direction finding is first presented, which replaces the
traditional available known DOAs so far employed with previous
estimates obtained on line. This idea is then incorporated into the
proposed algorithms and their extensions. Another approach is also
introduced to estimating the data covariance matrix by iteratively
reducing its by-products, which occurs in the finite sample region.
This concept is complemented by a reshaped…
Advisors/Committee Members: RODRIGO CAIADO DE LAMARE.
Subjects/Keywords: [pt] ESTIMACAO DE PARAMETROS EM ALTA RESOLUCAO; [en] HIGH-RESOLUTION PARAMETER ESTIMATION; [pt] ESTIMACAO DE DIRECAO; [en] DIRECTION FINDING; [pt] TECNICAS AUXILIADAS POR CONHECIMENTO; [en] KNOWLEDGEAIDED TECHNIQUES
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APA (6th Edition):
PINTO, S. F. B. (2018). [en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34917
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
PINTO, SILVIO FERNANDO BERNARDES. “[en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE.” 2018. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed February 28, 2021.
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34917.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
PINTO, SILVIO FERNANDO BERNARDES. “[en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE.” 2018. Web. 28 Feb 2021.
Vancouver:
PINTO SFB. [en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. [cited 2021 Feb 28].
Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34917.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
PINTO SFB. [en] HIGH-RESOLUTION DIRECTION FINDING TECHNIQUES EXPLOITING
PRIOR KNOWLEDGE. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34917
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
INP Toulouse
19.
Lominé, Jimmy.
Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding.
Degree: Docteur es, Micro-ondes, Électromagnétisme et Optoélectronique, 2014, INP Toulouse
URL: http://www.theses.fr/2014INPT0096
► De nos jours, il existe de nombreuses antennes de radiogoniométrie UHF large bande ou multibandes, néanmoins très peu d’entre elles permettent une couverture angulaire 3D.…
(more)
▼ De nos jours, il existe de nombreuses antennes de radiogoniométrie UHF large bande ou multibandes, néanmoins très peu d’entre elles permettent une couverture angulaire 3D. A notre connaissance, la première antenne de radiogoniométrie 3D fût étudiée dans les années 1960, par une équipe de l’université du Michigan. Composée de 17 capteurs positionnés sur une surface hémisphérique, sa taille et son nombre d’éléments en font un dispositif encombrant et complexe à utiliser. De récentes études ont proposé une autre approche basée sur la mesure multicomposante du champ électromagnétique, permettant de réduire la taille des antennes et le nombre d’éléments tout en conservant une couverture angulaire 3D. Cependant, à ce jours, seul des systèmes HF (3MHz-30MHz) ou bande étroite ont été abordés. Cette thèse porte donc sur l’étude et le développement d’une antenne vectorielle UHF multibande appliquée à la radiogoniométrie 3D pour des ondes transverses magnétiques. Tout d’abord, deux techniques de goniométrie adaptées à cette approche sont confrontées : une nouvelle technique basée sur la décomposition en harmonique sphérique du rayonnement de l’antenne qui permet de recomposer le champ électromagnétique reçu à partir d’échantillons mesurés et un algorithme bien connu, MUSIC. Une méthodologie de conception est proposée, en identifiant les critères physiques des antennes vectorielles qui influent sur leurs performances à savoir la précision d’estimation, la sensibilité, le nombre d’éléments et l’encombrement. Cette méthode est utilisée pour développer et réaliser une première antenne vectorielle monobande. La caractérisation de cette antenne réaliste permet d’écarter la première technique de traitement dont les performances sont trop sensibles aux perturbations de rayonnement. Une antenne vectorielle bibande compacte, d’un rayon de λ/4 et d’une hauteur de λ/5.5 à la fréquence la plus basse, composée de seulement six éléments rayonnants couvrant chacun les bandes de fréquences GSM [890MHz-960MHz] et [1710MHZ-1880MHz] est ensuite développée en se basant sur cette méthode de conception. Les capteurs électriques et magnétiques constituant l’antenne sont étudiés séparément puis assemblés selon une répartition spatiale planaire pour restreindre l’encombrement. Les structures rayonnantes sont communes pour les deux bandes de fréquences ce qui permet réduire le nombre d’éléments ainsi que les éventuelles perturbations de rayonnement. Après la caractérisation de l’antenne bibande au travers de simulations numériques, un prototype est réalisé et ses performances d’estimation sont mesurées en chambre anéchoïque afin de valider l’approche par simulation. La sensibilité obtenue est de -110dBW/m² (85μV/m) pour une précision de 5° RMS. Enfin l’étude est élargie au cas général d’antennes multibandes en illustrant le processus d’extension de la couverture fréquentielle par l’ajout d’une troisième bande, [400MHz-430MHz]. Six nouveaux éléments sont donc développés et intégrés aux capteurs GSM existants afin d’obtenir une antenne tribande d’un rayon…
Advisors/Committee Members: Aubert, Hervé (thesis director), Morlaas, Christophe (thesis director).
Subjects/Keywords: Antenne vectorielle; Antenne multibande; Radiogoniométrie 3D; Diversité de polarisation; Diversité spatiale; Vector sensor; Multiband antenna; 3D direction finding; Polarization diversity; Spatial diversity
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lominé, J. (2014). Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2014INPT0096
Chicago Manual of Style (16th Edition):
Lominé, Jimmy. “Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding.” 2014. Doctoral Dissertation, INP Toulouse. Accessed February 28, 2021.
http://www.theses.fr/2014INPT0096.
MLA Handbook (7th Edition):
Lominé, Jimmy. “Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding.” 2014. Web. 28 Feb 2021.
Vancouver:
Lominé J. Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding. [Internet] [Doctoral dissertation]. INP Toulouse; 2014. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2014INPT0096.
Council of Science Editors:
Lominé J. Étude d’une antenne vectorielle UHF multibande appliquée à la goniométrie 3D : Study of a multiband UHF vector sensor applied to the 3D direction finding. [Doctoral Dissertation]. INP Toulouse; 2014. Available from: http://www.theses.fr/2014INPT0096
Brigham Young University
20.
Huber, Braden Russell.
Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters.
Degree: MS, 2009, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2742&context=etd
► Aircraft in the US are equipped with Emergency Locator Transmitters (ELTs). In emergency situations these beacons are activated, providing a radio signal that can…
(more)
▼ Aircraft in the US are equipped with Emergency Locator Transmitters (ELTs). In emergency situations these beacons are activated, providing a radio signal that can be used to locate the aircraft. Recent developments in UAV technologies have enabled mini-UAVs (5-foot wingspan) to possess a high level of autonomy. Due to the small size of these aircraft they are human-packable and can be easily transported and deployed in the field. Using a custom-built Radio Direction Finder, we gathered readings from a known transmitter and used them to compare various Bayesian reasoning-based filtering algorithms. Using a custom-developed simulator, we were able to test and evaluate filtering and control methods. In most non-trivial conditions we found that the Sequential Importance Resampling (SIR) Particle Filter worked best. The filtering and control algorithms presented can be extended to other problems that involve UAV control and tracking with noisy non-linear sensor behavior.
Subjects/Keywords: radiolocation; radio direction finding; particle filter; unscented Kalman filter; state estimation; Computer Sciences
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APA (6th Edition):
Huber, B. R. (2009). Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2742&context=etd
Chicago Manual of Style (16th Edition):
Huber, Braden Russell. “Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters.” 2009. Masters Thesis, Brigham Young University. Accessed February 28, 2021.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2742&context=etd.
MLA Handbook (7th Edition):
Huber, Braden Russell. “Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters.” 2009. Web. 28 Feb 2021.
Vancouver:
Huber BR. Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters. [Internet] [Masters thesis]. Brigham Young University; 2009. [cited 2021 Feb 28].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2742&context=etd.
Council of Science Editors:
Huber BR. Radio Determination on Mini-UAV Platforms: Tracking and Locating Radio Transmitters. [Masters Thesis]. Brigham Young University; 2009. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2742&context=etd
Luleå University of Technology
21.
Wallander, Anders.
A robot scorpion using ground vibrations for navigation.
Degree: 2000, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-54721
► Robotics can learn a lot by investigating simple and effective techniques evolved in biology. The sand scorpion that lives in the Mojave Desert uses…
(more)
▼ Robotics can learn a lot by investigating simple and effective techniques evolved in biology. The sand scorpion that lives in the Mojave Desert uses ground vibrations when locating its prey. This thesis work shows that a robot can be made to navigate using similar techniques as the sand scorpion. A six- legged robot was constructed and fitted with vibration sensors to try the concept. A robot navigating with the help of ground vibrations could be used in applications such as the search for victims after natural disasters. This report presents the hardware design, algorithms for direction and location finding of a vibration source, simulation results and the performance of the direction finding system fitted on the robot.
Validerat; 20101217 (root)
Subjects/Keywords: Technology; Robot; Scorpion; Navigation; Direction finding; Ground; vibration; PVDF; Teknik
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APA (6th Edition):
Wallander, A. (2000). A robot scorpion using ground vibrations for navigation. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-54721
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wallander, Anders. “A robot scorpion using ground vibrations for navigation.” 2000. Thesis, Luleå University of Technology. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-54721.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wallander, Anders. “A robot scorpion using ground vibrations for navigation.” 2000. Web. 28 Feb 2021.
Vancouver:
Wallander A. A robot scorpion using ground vibrations for navigation. [Internet] [Thesis]. Luleå University of Technology; 2000. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-54721.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wallander A. A robot scorpion using ground vibrations for navigation. [Thesis]. Luleå University of Technology; 2000. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-54721
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
SOW SEK MENG.
DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS.
Degree: 2018, National University of Singapore
URL: https://scholarbank.nus.edu.sg/handle/10635/154949
Subjects/Keywords: Characteristic Mode Analysis; Structural Antenna; MIMO Antenna; Direction Finding; Beamforming; Null Steering
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APA (6th Edition):
MENG, S. S. (2018). DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS. (Thesis). National University of Singapore. Retrieved from https://scholarbank.nus.edu.sg/handle/10635/154949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
MENG, SOW SEK. “DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS.” 2018. Thesis, National University of Singapore. Accessed February 28, 2021.
https://scholarbank.nus.edu.sg/handle/10635/154949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
MENG, SOW SEK. “DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS.” 2018. Web. 28 Feb 2021.
Vancouver:
MENG SS. DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS. [Internet] [Thesis]. National University of Singapore; 2018. [cited 2021 Feb 28].
Available from: https://scholarbank.nus.edu.sg/handle/10635/154949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
MENG SS. DESIGN AND APPLICATIONS OF MULTI-FEED STRUCTURAL ANTENNA ON ELECTRICALLY SMALL PLATFORMS. [Thesis]. National University of Singapore; 2018. Available from: https://scholarbank.nus.edu.sg/handle/10635/154949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
PENG NINGKUN.
A correlation-based method for direction finding of multipath signals in frequency hopping systems.
Degree: 2005, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/17012
Subjects/Keywords: Direction finding; multipath; frequency hopping; correlation; least square; two-element array
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APA (6th Edition):
NINGKUN, P. (2005). A correlation-based method for direction finding of multipath signals in frequency hopping systems. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/17012
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
NINGKUN, PENG. “A correlation-based method for direction finding of multipath signals in frequency hopping systems.” 2005. Thesis, National University of Singapore. Accessed February 28, 2021.
http://scholarbank.nus.edu.sg/handle/10635/17012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
NINGKUN, PENG. “A correlation-based method for direction finding of multipath signals in frequency hopping systems.” 2005. Web. 28 Feb 2021.
Vancouver:
NINGKUN P. A correlation-based method for direction finding of multipath signals in frequency hopping systems. [Internet] [Thesis]. National University of Singapore; 2005. [cited 2021 Feb 28].
Available from: http://scholarbank.nus.edu.sg/handle/10635/17012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
NINGKUN P. A correlation-based method for direction finding of multipath signals in frequency hopping systems. [Thesis]. National University of Singapore; 2005. Available from: http://scholarbank.nus.edu.sg/handle/10635/17012
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
24.
Hu, Zhong.
Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems.
Degree: MS, Electrical and Computer Engineering, 1999, Virginia Tech
URL: http://hdl.handle.net/10919/32015
► We have created an eight-element antenna array system for evaluating various Angle of Arrival (AOA) Position Location (PL) algorithms, such as MUltiple SIgnal Classification (MUSIC)…
(more)
▼ We have created an eight-element antenna array system for evaluating various Angle of Arrival (AOA) Position Location (PL) algorithms, such as MUltiple SIgnal Classification (MUSIC) and Estimation of Signal Parameters via Rotational Invariance Techniques ESPRIT algorithms. Since using delay of arrival information can improve AOA estimates and classical PL algorithms do not incorporate Delay of Arrival (DOA) information, the performance of these algorithms is not optimal. Recently proposed Joint AOA and DOA Estimation (JADE) algorithms, though more complicated, potentially have higher resolutions in both space and time domains. Our investigation shows that by using bandlimited known signals it is possible to resolve the DOA within a fraction of the sample period using JADE algorithms. Joint AOA and DOA algorithms can provide high resolution DSP-based channel measurement using low bandwidth hardware.
Advisors/Committee Members: Reed, Jeffrey Hugh (committeechair), Rappaport, Theodore S. (committee member), Beex, A. A. Louis (committee member).
Subjects/Keywords: JADE ESPRIT; JADE MUSIC; DOA; AOA; Direction Finding; Antenna Array
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APA ·
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APA (6th Edition):
Hu, Z. (1999). Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32015
Chicago Manual of Style (16th Edition):
Hu, Zhong. “Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems.” 1999. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/32015.
MLA Handbook (7th Edition):
Hu, Zhong. “Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems.” 1999. Web. 28 Feb 2021.
Vancouver:
Hu Z. Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems. [Internet] [Masters thesis]. Virginia Tech; 1999. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/32015.
Council of Science Editors:
Hu Z. Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems. [Masters Thesis]. Virginia Tech; 1999. Available from: http://hdl.handle.net/10919/32015
Virginia Tech
25.
Khan, Zarak Ali.
Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms.
Degree: MS, Electrical and Computer Engineering, 2003, Virginia Tech
URL: http://hdl.handle.net/10919/46213
► The Range Limited Antenna (RLA) has the ability to track and pin-point RF devices operating within a certain accepted range. Using two antenna arrays, each…
(more)
▼ The Range Limited Antenna (RLA) has the ability to track and pin-point RF devices operating within a certain accepted range. Using two antenna arrays, each made up of several elements,
direction-
finding algorithms such as MUSIC and Modified Root Pisarenko (MRP) are used to estimate the angles of arrival of incoming signals. Using the estimated angles of arrival, a range estimation algorithm is used to estimate the distance of the emitter from the antenna array.
The aim of this thesis is to check the sensitivity of the range estimation and to form a statistical analysis for such conditions. Conditions of error are introduced into the system and several extensive Monte Carlo simulations are run for both MUSIC and MRP. Upon simulating physical errors in the antenna set-up, it is realized that the range estimation algorithm is sensitive to the slightest of phase shift differences, cable loss differences, mixer mismatches, and antenna mismatches.
Advisors/Committee Members: Zaghloul, Amir I. (committeechair), Davis, William A. (committee member), Reed, Jeffrey Hugh (committee member).
Subjects/Keywords: Range Limited Antenna; Direction-finding algorithms; MUSIC; Modified Root Pisarenko
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APA (6th Edition):
Khan, Z. A. (2003). Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/46213
Chicago Manual of Style (16th Edition):
Khan, Zarak Ali. “Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms.” 2003. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/46213.
MLA Handbook (7th Edition):
Khan, Zarak Ali. “Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms.” 2003. Web. 28 Feb 2021.
Vancouver:
Khan ZA. Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms. [Internet] [Masters thesis]. Virginia Tech; 2003. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/46213.
Council of Science Editors:
Khan ZA. Error Analysis of Angle and Range Estimation in a Range Limited Antenna System Using Music and Modified Root Pisarenko Algorithms. [Masters Thesis]. Virginia Tech; 2003. Available from: http://hdl.handle.net/10919/46213
26.
Scott, Robert.
An electrically small multi-port loop antenna for direction of arrival estimation.
Degree: MS, 1200, 2014, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/49439
► Direction of arrival (DoA) estimation or direction finding (DF) requires multiple sensors to determine the direction from which an incoming signal originates. These antennas are…
(more)
▼ Direction of arrival (DoA) estimation or
direction finding (DF) requires multiple sensors to determine the
direction from which an incoming signal originates. These antennas are often loops or dipoles oriented in a manner such
as to obtain as much information about the incoming signal as possible. For
direction finding at frequencies with larger wavelengths, the size of the array
can become quite large. In order to reduce the size of the array, electrically small elements may be used. Furthermore, a reduction in the number of necessary elements can help to accomplish the goal of miniaturization. The proposed antenna uses both of these methods, a reduction in size and a
reduction in the necessary number of elements.
A multi-port loop antenna is capable of operating in two distinct, orthogonal modes - a loop mode and a dipole mode. The mode in which the antenna
operates depends on the phase of the signal at each port. Because each element effectively serves as two distinct sensors, the number of elements in an DoA array is reduced by a factor of two. This thesis demonstrates that an array of these antennas accomplishes azimuthal DoA estimation with 18
degree maximum error and an average error of 4.3 degrees.
Advisors/Committee Members: Bernhard, Jennifer T. (advisor).
Subjects/Keywords: Direction of Arrival; Direction Finding; Multi-Port Loop Antenna; Electrically Small
…dipoles [5]
1.1 History of Direction Finding
The art and science of DoA estimation or… …accomplish
DoA estimation [7]. Other direction finding systems are well documented by… …information for determining the direction of arrival. However, for the consideration and… …positive z-direction
(θ-pol). This is the direction of highest gain for the dipole mode… …Normalized gain in the positive z-direction (θ-pol) as a function
of ground plane…
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APA (6th Edition):
Scott, R. (2014). An electrically small multi-port loop antenna for direction of arrival estimation. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/49439
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Scott, Robert. “An electrically small multi-port loop antenna for direction of arrival estimation.” 2014. Thesis, University of Illinois – Urbana-Champaign. Accessed February 28, 2021.
http://hdl.handle.net/2142/49439.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Scott, Robert. “An electrically small multi-port loop antenna for direction of arrival estimation.” 2014. Web. 28 Feb 2021.
Vancouver:
Scott R. An electrically small multi-port loop antenna for direction of arrival estimation. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2142/49439.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Scott R. An electrically small multi-port loop antenna for direction of arrival estimation. [Thesis]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/49439
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
27.
Slater, Matthew.
Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays.
Degree: PhD, 1200, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/34424
► The rst direction-of-arrival systems were based on amplitude measurements of signals received from a single, nonstationary antenna. Next generation systems depended on phase measurements for…
(more)
▼ The rst
direction-of-arrival systems were based on amplitude measurements of signals received from a single, nonstationary antenna. Next generation systems depended on phase measurements for
direction-of-arrival information.
With the advent of DSP-based
direction fi nding, a return to amplitude-based measurements is possible. This enables
direction-of-arrival estimation using
arrays whose interelement phase di erence is very small or even negligible.
Traditionally,
direction- nding systems have been quite large to ensure a re-
solvable phase delay between elements. Since the
direction- nding arrays presented here are much less reliant on interelement phase delay, their footprints can be dramatically reduced. Electrically small antennas have the radiation pattern of an electric dipole, a magnetic dipole, or some superpo-
sition of the two. Orthogonally oriented electrically small antennas receive with very distinct patterns when combined in an array, provided that the mutual coupling is small. With six elements measuring the Cartesian components of the electric and magnetic elds of an incident signal, it is possible to attain complete, unambiguous
direction-of-arrival and polarization information with little to no phase di erence between the elements.
Using small, co-located antenna arrays enables similar functionality to larger sensors while maintaining a much smaller footprint. Using electrically
small antenna elements causes some limitations for these arrays when compared with the vector-sensor case. This dissertation explores the tradeo ffs in performance available for small
direction- nding arrays in terms of physical
array parameters such as element size, spacing, and feed parameters. Novel approaches are explored in measuring and feeding electrically small antennas, unmatched antennas, and antennas with low interelement spacing. With such a small array, a new generation of
direction- nding devices is possible. These devices can serve a number of practical applications, including accurate portable handheld or vehicle-mounted
direction-of-arrival estimation.
Advisors/Committee Members: Bernhard, Jennifer T. (advisor), Bernhard, Jennifer T. (Committee Chair), Jones, Douglas L. (committee member), Franke, Steven J. (committee member), Schmitz, Christopher D. (committee member).
Subjects/Keywords: antennas; direction finding; direction-of-arrival estimation; electrically small antennas; amplified antennas; vector sensors
…of changing various array parameters in a direction-finding array. Chiefly, there has been… …of small direction-finding arrays. Due to their
small size and close spacing, several… …interesting example of direction finding in nature is the
Ormia Ochracea. The Ormia Ochracea, shown… …delay leads to dramatically
increased direction-finding capability.
3
Figure 1.3: Typical… …direction
finding, so they are only tangentially related to the present work.
1.2.1 Vector…
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APA (6th Edition):
Slater, M. (2012). Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/34424
Chicago Manual of Style (16th Edition):
Slater, Matthew. “Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 28, 2021.
http://hdl.handle.net/2142/34424.
MLA Handbook (7th Edition):
Slater, Matthew. “Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays.” 2012. Web. 28 Feb 2021.
Vancouver:
Slater M. Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2142/34424.
Council of Science Editors:
Slater M. Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/34424
INP Toulouse
28.
Duplouy, Johan.
Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D.
Degree: Docteur es, Electromagnétisme et Systèmes Haute Fréquence, 2019, INP Toulouse
URL: http://www.theses.fr/2019INPT0002
► La radiogoniométrie joue un rôle crucial dans diverses applications, aussi bien civiles que militaires, liées soit à la radionavigation ou à la radiolocalisation. La plupart…
(more)
▼ La radiogoniométrie joue un rôle crucial dans diverses applications, aussi bien civiles que militaires, liées soit à la radionavigation ou à la radiolocalisation. La plupart des antennes de goniométrie opèrent sur une large bande de fréquences, mais seule une minorité d’entre elles permettent l'estimation de la direction d’arrivée d’un champ électromagnétique incident sur une couverture angulaire 3-D (c.-à-d., l’estimation à la fois des angles d’azimut et d’élévation). Une approche originale permettant d’obtenir une couverture angulaire 3-D consiste à mesurer les six composantes d’un champ électromagnétique incident à l’aide d’une antenne dite vectorielle. L'objectif de cette thèse est de concevoir une antenne vectorielle passive, compacte et large bande afin de couvrir un maximum d'applications. Deux antennes vectorielles ont été conçues, fabriquées et caractérisées expérimentalement. \`A la différence d'une topologie conventionnelle, elles permettent de mesurer les composantes d'un champ électromagnétique incident grâce à la reconfigurabilité en diagramme de rayonnement d'un arrangement original d'antennes Vivaldi. Le premier prototype est monté sur un support métallique fini et permet l'estimation de la direction d'arrivée de champs électromagnétiques polarisés verticalement sur une bande passante de 1.69:1 tandis que le second peut être utilisé quelle que soit la polarisation des champs électromagnétiques incidents sur une bande passante de 8:1. De plus, les performances de goniométrie de ces antennes vectorielles ont été améliorées du point de vue de la précision, de la sensibilité, de la robustesse face aux ambiguïtés angulaires et aux erreurs de dépolarisation en synthétisant de nouveaux diagrammes de rayonnement dans le processus d'estimation. Une méthode basée sur la borne de Cramer-Rao a été élaborée afin de sélectionner efficacement et rapidement les diagrammes de rayonnement supplémentaires.
Direction finding plays a crucial role in various civilian and military applications, related to either radionavigation or radiolocation. Most of the direction finding antennas operate over a wide frequency band, but only a minority of them enable the direction of arrival estimation of an incoming electromagnetic field over a 3-D angular coverage (i.e., estimation of both azimuth and elevation angles). An original approach to obtain a 3-D angular coverage consists in measuring the six components of the incident electromagnetic field through a so-called vector antenna. The aim of this Ph.D. is to design a passive, compact and wideband vector antenna in order to cover a maximum of applications. Two vector antennas have been designed, manufactured and experimentally characterized. Unlike conventional topology, they enable the measurement of the components of an incoming electromagnetic field thanks to the radiation pattern reconfigurability of an original arrangement of Vivaldi antennas. The first prototype is mounted over a finite metallic support and enables the direction of arrival estimation of…
Advisors/Committee Members: Aubert, Hervé (thesis director), Morlaas, Christophe (thesis director).
Subjects/Keywords: Antenne de goniométrie 3D; Antenne vectorielle; Dipoles électrique et magnétique large bande; Antenne reconfigurable en diagramme; Diversité de diagramme de rayonnement; 3D direction finding antenna; Vector antenna; Wideband electric and magnetic dipoles; Radiation pattern reconfigurable antenna; Radiation pattern diversity
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APA ·
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Export
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APA (6th Edition):
Duplouy, J. (2019). Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2019INPT0002
Chicago Manual of Style (16th Edition):
Duplouy, Johan. “Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D.” 2019. Doctoral Dissertation, INP Toulouse. Accessed February 28, 2021.
http://www.theses.fr/2019INPT0002.
MLA Handbook (7th Edition):
Duplouy, Johan. “Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D.” 2019. Web. 28 Feb 2021.
Vancouver:
Duplouy J. Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D. [Internet] [Doctoral dissertation]. INP Toulouse; 2019. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2019INPT0002.
Council of Science Editors:
Duplouy J. Wideband reconfigurable vector antenna for 3-D direction finding application : Antenne Vectorielle Reconfigurable et Large-Bande appliquée à la Radiogoniométrie 3-D. [Doctoral Dissertation]. INP Toulouse; 2019. Available from: http://www.theses.fr/2019INPT0002
29.
Perup, Daniel.
VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave.
Degree: Electronics Design, 2013, Mid Sweden University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20015
► The objective of this thesis was to evaluate radio receivers that had been previously acquired for other tasks by the Swedish Defence Materiel Administration,…
(more)
▼ The objective of this thesis was to evaluate radio receivers that had been previously acquired for other tasks by the Swedish Defence Materiel Administration, for additional service in a radio direction finding (DF) system. The antenna, calibration signal generator and DF algorithm were provided. As the receivers used the VITA 49 frame format, much of the work involved the interpretation of the frame structure and contents. The other main challenges were to put the receivers into the correct internal state, to compensate the analogue phase errors due to cabling, and to correlate the digital frames according to the time stamps. The work was performed partly as a literature study and, during implementation, by using an investigative trial and-error method. Collection of reference signals, for later offline analysis, was made at the Swedish Defence Research Agency. The findings of the evaluation was that the receivers were phase coherent and that the VITA 49 frame format was suitable for DF use. An apparently systematic error of unknown origin rendered the DF results inaccurate, even though the precision of the results was high. The automatic gain control (AGC) of the receivers did not perform according to norm. If the systematic error is compensated for, and the AGC problem is eliminated, the receivers will function as a DF system using the manufacturer's instructions, with the provided antenna. The performance of the receivers in this setting was not a primary concern for the thesis, but was deemed to be acceptable. Suggestions for further development include finding the source of the systematic error, an automatic calibration function, a more thorough performance analysis, and code optimizations using multiple threads.
Subjects/Keywords: Radio direction finding; DF; Octave; MATLAB; signal analysis; VITA 49; Communication Systems; Kommunikationssystem
…commands for carrying out direction finding with the
receivers.
The DF algorithm was provided by… …this error is truly systematic, and finding its cause, is a
prime subject for further study… …in Means for Determining the Direction of
a Distant Source of Electro-magnetic Radiation… …1919, UK Patent
130490.
[4]
Y.T Chan, B.H Lee, R. Inkol, Q. Yuan, “Direction… …finding with a fourelement Adcock-Butler matrix antenna array”, IEEE Transactions on
Aerospace…
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APA (6th Edition):
Perup, D. (2013). VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave. (Thesis). Mid Sweden University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20015
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Perup, Daniel. “VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave.” 2013. Thesis, Mid Sweden University. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20015.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Perup, Daniel. “VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave.” 2013. Web. 28 Feb 2021.
Vancouver:
Perup D. VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave. [Internet] [Thesis]. Mid Sweden University; 2013. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20015.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Perup D. VITA 49 Radio DF : Using coherent digital receiver set with VC++ and Octave. [Thesis]. Mid Sweden University; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20015
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
30.
Reed, Jesse.
Approaches to Multiple-source Localization and Signal Classification.
Degree: MS, Electrical and Computer Engineering, 2009, Virginia Tech
URL: http://hdl.handle.net/10919/33081
► Source localization with a wireless sensor network remains an important area of research as the number of applications with this problem increases. This work considers…
(more)
▼ Source localization with a wireless sensor network remains an important area of research as the number of applications with this problem increases. This work considers the problem of source localization by a network of passive wireless sensors. The primary means by which localization is achieved is through
direction-
finding at each sensor, and in some cases, range estimation as well. Both single and multiple-target scenarios are considered in this research. In single-source environments, a solution that outperforms the classic least squared error estimation technique by combining
direction and range estimates to perform localization is presented. In multiple-source environments, two solutions to the complex data association problem are addressed. The first proposed technique offers a less complex solution to the data association problem than a brute-force approach at the expense of some degradation in performance. For the second technique, the process of signal classification is considered as another approach to the data association problem. Environments in which each signal possesses unique features can be exploited to separate signals at each sensor by their characteristics, which mitigates the complexity of the data association problem and in many cases improves the accuracy of the localization. Two approaches to signal-selective localization are considered in this work. The first is based on the well-known cyclic MUSIC algorithm, and the second combines beamforming and modulation classification. Finally, the implementation of a
direction-
finding system is discussed. This system includes a uniform circular array as a radio frequency front end and the universal software radio peripheral as a data processor.
Advisors/Committee Members: Reed, Jeffrey Hugh (committee member), da Silva, Claudio R. C. M. (committeecochair), Buehrer, R. Michael (committeecochair).
Subjects/Keywords: Multiple-Source Localization; Source Classification; Direction Finding; MUSIC; cyclic MUSIC; Modulation Classification; Single-Source Localization; Data Association
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APA (6th Edition):
Reed, J. (2009). Approaches to Multiple-source Localization and Signal Classification. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33081
Chicago Manual of Style (16th Edition):
Reed, Jesse. “Approaches to Multiple-source Localization and Signal Classification.” 2009. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/33081.
MLA Handbook (7th Edition):
Reed, Jesse. “Approaches to Multiple-source Localization and Signal Classification.” 2009. Web. 28 Feb 2021.
Vancouver:
Reed J. Approaches to Multiple-source Localization and Signal Classification. [Internet] [Masters thesis]. Virginia Tech; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/33081.
Council of Science Editors:
Reed J. Approaches to Multiple-source Localization and Signal Classification. [Masters Thesis]. Virginia Tech; 2009. Available from: http://hdl.handle.net/10919/33081
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Open Access Theses and Dissertations
