subject:(Polarimetric Phased Array Radar)

University of Oklahoma

1. Li, Zhe. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/325311

► A desirable candidate for future weather observation is a polarimetric phased array radar (PPAR), which is capable of both using polarimetry for multi-parameter measurements and… (more)

▼ A desirable candidate for future weather observation is a polarimetric phased array radar (PPAR), which is capable of both using polarimetry for multi-parameter measurements and the fast-scan proficiency of the PAR. However, it is challenging to collect high-quality polarimetric radar data of weather with a planar PPAR (PPPAR), whose beam and polarization characteristics change with the electronic beam direction, causing geometrically induced cross-polarization coupling, sensitivity losses, and measurement biases when the PPPAR beam is steered away from the broadside. As an alternative to PPPAR, the concept of cylindrical polarimetric phased array radar (CPPAR) was proposed, which has scan-invariant beam characteristics in azimuth and polarization purity in all directions using commutating scan, thus enables high quality polarimetric weather measurements. To validate the CPPAR concept, a small-scale CPPAR demonstrator has been jointly developed by the Advanced Radar Research Center (ARRC) at the University of Oklahoma (OU) and the National Severe Storms Laboratory (NSSL) of NOAA. This dissertation presents the results of initial weather measurements, shows the performance of the CPPAR demonstrator, and evaluates the polarimetric data quality that has been achieved. The system specifications and field tests of the CPPAR demonstrator are provided, including system overview, waveform design and verification, pattern optimization and far-field tests. In addition, three methods of system calibration are introduced and compared, including calibration with an external source, calibration with weather measurements of mechanical scan, and calibration with ground clutter. It is found that calibration with weather measurements of mechanical scan has the best performance and it is applied on the CPPAR demonstrator for the first time, which effectively improved the beam-to-beam consistency and radar data quality in commutating beam electronic scan by minimizing gain and beamwidth variations. Performance of the CPPAR is assessed through system simulation and weather measurements. The CPPAR is evaluated through an end-to-end phased array radar system simulator (PASIM). The simulation framework, weather returns modeling, antenna pattern, channel electronics, and simulation results of CPPAR, as well as comparison with those that would be obtained with a PPPAR, are provided. Also, weather measurements of a few convective precipitation cases and a stratiform precipitation case made with the CPPAR, employing the single beam mechanical scan and commutating beam electronic scan respectively, are presented. First, a qualitative comparison is made between the CPPAR and a nearby operational NEXRAD. Then a quantitative comparison is conducted between the mechanical scan and electronic scan, and error statistics are estimated and discussed. In addition, a theoretical explanation of a feature of the commutating beam electronic scan in clutter detection that is different from mechanical scan is presented and verified by measurements in clear… Advisors/Committee Members: Zhang, Guifu (advisor), Sigmarsson, Hjalti (committee member), Zrnić, Dusan (committee member), Zhu, Meijun (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Engineering, Electronics and Electrical.; Weather Radar; Cylindrical Polarimetric Phased Array Radar

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APA (6^th Edition):

Li, Z. (2020). CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/325311

Chicago Manual of Style (16^th Edition):

Li, Zhe. “CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/325311.

MLA Handbook (7^th Edition):

Li, Zhe. “CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.” 2020. Web. 08 Mar 2021.

Vancouver:

Li Z. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/325311.

Council of Science Editors:

Li Z. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/325311

University of Oklahoma

2. Schvartzman, David. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/326580

► The Weather Surveillance Radar 1988 Doppler (WSR-88D) network has been operational for over 30 years and is still the primary observational instrument employed by the… (more)

▼ The Weather Surveillance Radar 1988 Doppler (WSR-88D) network has been operational for over 30 years and is still the primary observational instrument employed by the National Weather Service (NWS) forecasters to support their critical mission of issuing severe weather warnings and forecasts in the United States. Nevertheless, the WSR-88Ds have exceeded their engineering design lifespan and are projected to reach the end of operational lifetime by 2040. Technological limitations may prevent the WSR-88D to meet demanding functional requirements for future observational needs. The National Oceanic and Atmospheric Administration (NOAA) has started considering radar systems with advanced capabilities for the eventual replacement of the WSR-88D. Unique and flexible capabilities offered by Phased Array Radar (PAR) technology support the required enhanced weather surveillance strategies that are envisioned to improve the weather radar products, making PAR technology an attractive candidate for the next generation of weather radars. If PAR technology is to replace the operational WSR-88D, important decisions must be made regarding the architecture that will be needed to meet the functional requirements. A four-faced planar PAR (4F-PAR) is expected to achieve the requirements set forth by NOAA and the NWS, but deploying and maintaining an operational network of these radars across the U.S. will likely be unaffordable. A more affordable alternative radar system is based on a single-face Rotating PAR (RPAR) architecture, which is capable of exceeding the functionality provided by the WSR-88D network. This dissertation is focused on exploring advanced RPAR scanning techniques in support of meeting future radar functional requirements. A survey of unique RPAR capabilities is conducted to determine which ones could be exploited under an RPAR Concept of Operations (CONOPS). Three capabilities are selected for further investigation: beam agility, digital beamforming, and dwell flexibility. The RPARs beam agility is exploited to minimize the beam smearing that results from the rotation of the antenna system over the collection of samples in the coherent processing interval. The use of digital beamforming is investigated as a possible way to reduce the scan time and/or the variance of estimates. The RPAR's dwell flexibility capability is explored as a possible way to tailor the scan to meteorological observations with the goal of improving data quality. Three advanced RPAR scanning techniques are developed exploiting these capabilities, and their performance in support of meeting the radar functional requirements is quantified. The proposed techniques are implemented on the Advanced Technology Demonstrator (ATD), a dual-polarization RPAR system at the National Severe Storms Laboratory (NSSL) in Norman, OK. Data collection experiments are conducted with the ATD to demonstrate the performance of the proposed techniques for dual-polarization observations. Results are verified by quantitatively comparing fields of radar-variable… Advisors/Committee Members: Yu, Tian-You (advisor), Torres, Sebastian (committee member), Yeary, Mark (committee member), Salazar-Cerreno, Jorge (committee member), Wang, Ying (committee member).

Subjects/Keywords: Weather Radar; Polarimetric Phased Array Radar; Signal Processing; Concept of Operations; Digital Beamdorming

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APA (6^th Edition):

Schvartzman, D. (2020). Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/326580

Chicago Manual of Style (16^th Edition):

Schvartzman, David. “Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/326580.

MLA Handbook (7^th Edition):

Schvartzman, David. “Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.” 2020. Web. 08 Mar 2021.

Vancouver:

Schvartzman D. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/326580.

Council of Science Editors:

Schvartzman D. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/326580

Colorado State University

3. Nguyen, Cuong Manh. Electronic scan weather radar: scan strategy and signal processing for volume targets.

Degree: PhD, Electrical and Computer Engineering, 2013, Colorado State University

URL: http://hdl.handle.net/10217/80963

► Following the success of the WSR-88D network, considerable effort has been directed toward searching for options for the next generation of weather radar technology. With… (more)

▼ Following the success of the WSR-88D network, considerable effort has been directed toward searching for options for the next generation of weather radar technology. With its superior capability for rapidly scanning the atmosphere, electronically scanned phased array radar (PAR) is a potential candidate. A network of such radars has been recommended for consideration by the National Academies Committee on Weather Radar Technology beyond NEXRAD. While conventional weather radar uses a rotating parabolic antenna to form and direct the beam, a phased array radar superimposes outputs from an array of many similar radiating elements to yield a beam that is scanned electronically. An adaptive scan strategy and advanced signal designs and processing concepts are developed in this work to use PAR effectively for weather observation. An adaptive scan strategy for weather targets is developed based on the space-time variability of the storm under observation. Quickly evolving regions are scanned more often and spatial sampling resolution is matched to spatial scale. A model that includes the interaction between space and time is used to extract spatial and temporal scales of the medium and to define scanning regions. The temporal scale constrains the radar revisit time while the measurement accuracy controls the dwell time. These conditions are employed in a task scheduler that works on a ray-by-ray basis and is designed to balance task priority and radar resources. The scheduler algorithm also includes an optimization procedure for minimizing radar scan time. In this research, a signal model for polarimetric phased array weather radar (PAWR) is presented and analyzed. The electronic scan mechanism creates a complex coupling of horizontal and vertical polarizations that produce the bias in the polarimetric variables retrieval. Methods for bias correction for simultaneous and alternating transmission modes are proposed. It is shown that the bias can be effectively removed; however, data quality degradation occurs at far off boresight directions. The effective range for the bias correction methods is suggested by using radar simulation. The pulsing scheme used in PAWR requires a new ground clutter filtering method. The filter is designed to work with a signal covariance matrix in the time domain. The matrix size is set to match the data block size. The filter's design helps overcome limitations of spectral filtering methods and make efficient use of reducing ground clutter width in PAWR. Therefore, it works on modes with few samples. Additionally, the filter can be directly extended for staggered PRT waveforms. Filter implementation for polarimetric retrieval is also successfully developed and tested for simultaneous and alternating staggered PRT. The performance of these methods is discussed in detail. It is important to achieve high sensitivity for PAWR. The use of low-power solid state transmitters to keep costs down requires pulse compression technique. Wide-band pulse compression filters will partly reduce the system… Advisors/Committee Members: Chandra, Chandrasekar V. (advisor), Jayasumana, Anura P. (committee member), Mielke, Paul W. (committee member), Notaros, Branislav (committee member).

Subjects/Keywords: polarimetric weather radar; remote sensing; radar signal processing; electronic scan strategy; phased array weather radar; radar pulse compression

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APA (6^th Edition):

Nguyen, C. M. (2013). Electronic scan weather radar: scan strategy and signal processing for volume targets. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/80963

Chicago Manual of Style (16^th Edition):

Nguyen, Cuong Manh. “Electronic scan weather radar: scan strategy and signal processing for volume targets.” 2013. Doctoral Dissertation, Colorado State University. Accessed March 08, 2021. http://hdl.handle.net/10217/80963.

MLA Handbook (7^th Edition):

Nguyen, Cuong Manh. “Electronic scan weather radar: scan strategy and signal processing for volume targets.” 2013. Web. 08 Mar 2021.

Vancouver:

Nguyen CM. Electronic scan weather radar: scan strategy and signal processing for volume targets. [Internet] [Doctoral dissertation]. Colorado State University; 2013. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10217/80963.

Council of Science Editors:

Nguyen CM. Electronic scan weather radar: scan strategy and signal processing for volume targets. [Doctoral Dissertation]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/80963

University of Oklahoma

4. Yu, Xining. Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52417

► This dissertation presents an implementation of multifunctional large-scale phased array radar based on the scalable DSP platform. The challenge of building large-scale phased array radar… (more)

Subjects/Keywords: phased array radar

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APA (6^th Edition):

Yu, X. (2017). Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52417

Chicago Manual of Style (16^th Edition):

Yu, Xining. “Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/52417.

MLA Handbook (7^th Edition):

Yu, Xining. “Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms.” 2017. Web. 08 Mar 2021.

Vancouver:

Yu X. Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/52417.

Council of Science Editors:

Yu X. Digital Signal Processor Based Real-Time Phased Array Radar Backend System and Optimization Algorithms. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52417

University of Michigan

5. Schulwitz, Lora Sue. Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications.

Degree: PhD, Electrical engineering, 2007, University of Michigan

URL: http://hdl.handle.net/2027.42/126551

► In this dissertation, several new millimeter-wave phased array circuits and antennas are presented for polarimetric radar applications. In particular, a compact tray architecture is discussed,… (more)

▼ In this dissertation, several new millimeter-wave phased array circuits and antennas are presented for polarimetric radar applications. In particular, a compact tray architecture is discussed, which is based on new miniature dielectric filled L-shaped horn antennas and Rotman lens beamforming circuitry. The antenna array and associated waveguide feeds are realized through a multilayer stereolighography process, which interfaces with the Rotman lens circuitry through low-profile substrate integrated waveguide to microstrip transitions. The L-shaped horn antenna array is dual polarized, therefore allowing for the independent beam steering of the vertical and horizontal polarizations. In this dissertation, the Rotman lens is used to achieve broadband true time delay beam steering. In particular, the design of a new low loss Rotman lens is described, where a synthesized dielectric gradient is introduced within the lens to achieve enhanced focusing. Here, the fundamental Rotman lens equations are modified according to geometric optics. With this modified design, minimal power is lost to the side ports of the modified lens, in contrast to the conventional Rotman lenses. This technique allows for an insertion loss improvement of up to 3 dB for the Rotman lens. In addition, further loss improvement is realized due to the elimination of meander lines between the Rotman lens array ports and the antennas. Finally, to improve the angular resolution, a monopulse Rotman lens is described, where 0°/180° switched line phase shifters are integrated with the Rotman lens meander lines. To demonstrate the feasibility of the aforementioned phased array circuits and antennas, a phased array radar with electronically controlled scanning in the azimuth and elevation planes is implemented. Through observing the signal return from 34 to 40 GHz, the locations of targets are detected within a three-dimensional space with better than 5 cm range resolution. Finally, by using the same technique that was used for the integration of the Rotman lens circuitry with the horn antenna array, a packaging technique with improved isolation for microwave and millimeter-wave circuits is implemented. Compared to the conventional packaging techniques, the technique presented here shows approximately 20 dB isolation improvement.* *This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Adobe Acrobat. Advisors/Committee Members: Mortazawi, Amir (advisor).

Subjects/Keywords: Antennas; Applications; Broadband; Circuits; Millimeter; Phased-array; Polarimetric Radar; Wave

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APA (6^th Edition):

Schulwitz, L. S. (2007). Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126551

Chicago Manual of Style (16^th Edition):

Schulwitz, Lora Sue. “Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications.” 2007. Doctoral Dissertation, University of Michigan. Accessed March 08, 2021. http://hdl.handle.net/2027.42/126551.

MLA Handbook (7^th Edition):

Schulwitz, Lora Sue. “Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications.” 2007. Web. 08 Mar 2021.

Vancouver:

Schulwitz LS. Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/2027.42/126551.

Council of Science Editors:

Schulwitz LS. Broadband millimeter-wave phased array circuits and antennas for polarimetric radar applications. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/126551

University of Oklahoma

6. Dunn, Zachary. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34587

► Many new and interesting radar operational modes and techniques are being explored to maximize the efficiency and utility of next-generation radar systems while complying with… (more)

▼ Many new and interesting radar operational modes and techniques are being explored to maximize the efficiency and utility of next-generation radar systems while complying with increasingly stringent operational and budgeting requirements. This dissertation's aim is to analyze and present possible techniques to help maximize the scientific value of measurements while complying with operational requirements through methods of physical transmission and exciting the target area, methods of processing the received waveforms, and methods of designing waveforms for a given system. In regard to methods of physical transmission and exciting the target area, this dissertation addresses unique problems that will be faced by next-generation radar systems utilizing simultaneous transmit and simultaneous receive operational modes in polarimetric active phased array architectures. This is accomplished through establishing mathematical representations of the received complex baseband waveforms for dual-polarimetric radar operation and analyzing the predicted behavior versus traditional polarimetric radar alternating transmit and simultaneous receive operation. In regard to methods of processing the received waveforms, pulse compression will undoubtedly be widely utilized in future radar systems due to the increase in range resolution that it provides for a given pulse length. Additionally, matched filtering allows the realization of simultaneously transmitted pseudo-orthogonal waveforms occupying the same spectral region that would be otherwise impossible. As a result, the mathematical basis of pulse compression is provided, and pulse compression effects are taken into account in all relevant system analyses in this manuscript. This dissertation arguably provides the most attention in regard to methods for designing and modifying waveforms for application in a given system. An analysis of common pulse compression waveforms for suitability in pseudo-orthogonal waveform sets is provided in addition to a novel method for designing polyphase coded waveform and non-linear frequency modulated waveform based pseudo-orthogonal waveform sets utilizing particle swarm optimization. Additionally, for the first time, research is presented on the full design and application methods for digital predistortion of wideband solid state radar amplifiers. Digital predistortion methods and results are presented for both the impedance matched high power amplifier case and for the varying load impedance case that can be expected to be encountered in radar systems utilizing electronic beamsteering in active phased array architectures. Overall, this dissertation's aim is to provide relevant results from conducted research in the form of analysis and novel design methods that can be applied in both the design and operation of next-generation radar systems to maximize utility and scientific data quality while operating within given system and environmental specifications. Advisors/Committee Members: Yeary, Mark (advisor), Fulton, Caleb (committee member), Goodman, Nathan (committee member), Ruyle, Jessica (committee member), Biggerstaff, Michael (committee member).

Subjects/Keywords: Digital Predistortion; Phased Array; Polarimetric; Engineering, Electronics and Electrical.

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APA (6^th Edition):

Dunn, Z. (2016). Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34587

Chicago Manual of Style (16^th Edition):

Dunn, Zachary. “Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/34587.

MLA Handbook (7^th Edition):

Dunn, Zachary. “Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.” 2016. Web. 08 Mar 2021.

Vancouver:

Dunn Z. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/34587.

Council of Science Editors:

Dunn Z. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34587

University of Oklahoma

7. Peccarelli, Nicholas. Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/324399

► Modern radar (military, automotive, weather, etc.) and communication systems seek to leverage the spatio-spectral efficiency of phased arrays. Specifically, there is an increasingly large demand… (more)

▼ Modern radar (military, automotive, weather, etc.) and communication systems seek to leverage the spatio-spectral efficiency of phased arrays. Specifically, there is an increasingly large demand for fully-digital arrays, with each antenna element having its own transmitter and receiver. Further, in order to makes these systems realizable, low-cost, low-complexity solutions are required, often sacrificing the system's linearity. Lower linearity paired with the inherent lack of RF spacial filtering can make these highly digital systems vulnerable to high-power interferering signals – potentially introducing spectral regrowth and/or gain compression, distorting the signal-of-interest. Digital linearization solutions such as Digital Pre-Distiortion (DPD) and Nonlinear Equalization (NLEQ) have been shown to effectively mitigate nonlinearities for transmitters and receivers, respectively. Further, DPD and NLEQ seek to extend the effective dynamic range of digital arrays, helping the systems reach their designed dynamic range improvement of 10log₁₀(N)~dB, where N is the number of transmitters/receivers. However, the performance of these solutions is ultimately determined by training model and waveform. Further, the nonlinear characteristics of a system can change with temperature, frequency, power, time, etc., requiring a robust calibration technique to maintain a high-level of nonlinear mitigation. This dissertation reviews the different types of nonlinear models and the current NLEQ and DPD algorithms for digital array systems. Further, a generalized calibration waveform for both NLEQ and DPD is proposed, allowing a system to maximize its dynamic range over power and frequency. Additionally, an it{in-situ} calibration method, leveraging the inherent mutual coupling in an array, is proposed as a solution to maintaining a high level of performance in a fielded digital array system over the system's lifetime. The combination of the proposed training waveform and it{in-situ} calibration technique prove to be very effective at adaptively creating a generalized solution to extending the dynamic range of future low-cost digital array systems. Advisors/Committee Members: Fulton, Caleb (advisor), Goodman, Nathan (committee member), Sigmarsson, Hjalti (committee member), McDaniel, Jay (committee member), Grigo, Alexander (committee member).

Subjects/Keywords: Nonlinear Equalization; Phased Array; Radar; Signal Processing

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APA (6^th Edition):

Peccarelli, N. (2020). Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/324399

Chicago Manual of Style (16^th Edition):

Peccarelli, Nicholas. “Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/324399.

MLA Handbook (7^th Edition):

Peccarelli, Nicholas. “Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems.” 2020. Web. 08 Mar 2021.

Vancouver:

Peccarelli N. Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/324399.

Council of Science Editors:

Peccarelli N. Nonlinear Equalization and Digital Pre-Distortion Techniques for Future Radar and Communications Digital Array Systems. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/324399

University of Oklahoma

8. Mahre, William Andrew. Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/324153

► Currently, NEXRAD provides weather radar coverage for the contiguous United States. It is believed that a replacement system for NEXRAD will be in place by… (more)

▼ Currently, NEXRAD provides weather radar coverage for the contiguous United States. It is believed that a replacement system for NEXRAD will be in place by the year 2040, where a major goal of such a system is to provide improved temporal resolution compared to the 5-10-min updates of NEXRAD. In this dissertation, multiple projects are undertaken to help achieve the goals of improved temporal resolution, and to understand possible scanning strategies and radar designs that can meet the goal of improved temporal resolution while either maintaining (or improving) data quality. Chapter 2 of this dissertation uses a radar simulator to simulate the effect of various scanning strategies on data quality. It is found that while simply reducing the number of pulses per radial decreases data quality, other methods such as beam multiplexing and radar imaging/digital beamforming offer significant promise for improving data quality and/or temporal resolution. Beam multiplexing is found to offer a speedup factor of 1.7-2.9, while transmit beam spoiling by 10 degrees in azimuth can offer speedup factors up to ~4 in some regions. Due to various limitations, it is recommended that these two methods be used judiciously for rapid-scan applications. Chapter 3 attempts to quantify the benefits of a rapid-scan weather radar system for tornado detection. The first goal of Chapter 3 is to track the development of a common tornado signature (tornadic debris signature, or TDS) and relate it to developments in tornado strength. This is the first study to analyze the evolution of common tornado signatures at very high temporal resolution (6 s updates) by using a storm-scale tornado model and a radar emulator. This study finds that the areal extent of the TDS is correlated with both debris availability and with tornado strength. We also find that significant changes in the radar moment variables occur on short (sub-1-min) timescales. Chapter 3 also shows that the calculated improvement in tornado detection latency time (137-207 s) is greater than that provided by theory alone (107 s). Together, the two results from Chapter 3 emphasize the need for sub-1-min updates in some applications such as tornado detection. The ability to achieve these rapid updates in certain situations will likely require a combination of advanced scanning strategies (such as those mentioned in Chapter 2) and adaptive scanning. Chapter 4 creates an optimization-based model to adaptively reallocate radar resources for the purpose of improving data quality. This model is primarily meant as a proof of concept to be expanded to other applications in the future. The result from applying this model to two real-world cases is that data quality is successfully improved in multiple areas of enhanced interest, at the expense of worsening data quality in regions where data quality is not as important. This model shows promise for using adaptive scanning in future radar applications. Together, these results can help the meteorological community understand the needs,… Advisors/Committee Members: Palmer, Robert (advisor), Yu, Tian-You (advisor), Homeyer, Cameron (committee member), Chilson, Phil (committee member), Yeary, Mark (committee member), Bodine, David (committee member).

Subjects/Keywords: Radar data quality; Phased Array Radar; Radar scanning strategies; Tornado detection

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APA (6^th Edition):

Mahre, W. A. (2020). Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/324153

Chicago Manual of Style (16^th Edition):

Mahre, William Andrew. “Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/324153.

MLA Handbook (7^th Edition):

Mahre, William Andrew. “Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions.” 2020. Web. 08 Mar 2021.

Vancouver:

Mahre WA. Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/324153.

Council of Science Editors:

Mahre WA. Quantitative Analysis of Rapid-Scan Phased Array Weather Radar Benefits and Data Quality Under Various Scan Conditions. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/324153

Brigham Young University

9. Webb, Taylor D. Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy.

Degree: MS, 2012, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4320&context=etd

► Research institutions around the globe are developing phased array feed (PAF) systems for wide-field L-band radio astronomical observations. PAFs offer faster survey speeds and larger… (more)

▼ Research institutions around the globe are developing phased array feed (PAF) systems for wide-field L-band radio astronomical observations. PAFs offer faster survey speeds and larger fields of view than standard single-pixel feeds, which enable rapid sky surveys and significantly increased scientific capability. Because deep space astronomical signals are inherently weak, PAF systems must meet stringent noise and sensitivity requirements. Meeting these requirements requires detailed modeling of the phased array itself as well as the reflector it is mounted on. This thesis details a novel approach to dual-pol PAF design that models the array and reflector as a complete system in order to achieve a more optimal sensitivity and system noise temperature. The design and construction of two arrays designed using this technique is discussed. The implementation of a data acquisition system to receive data from the first of these arrays is also detailed. Polarization state information plays an important role in understanding cosmological processes for many deep space sources. Because of phase and gain imbalances in the LNAs and receiver chains calibration is required for accurate measurement of polarization by phased array feeds. As a result accurate polarimetric calibration techniques are essential for many observations. Existing polarimetric calibration methods are based on assumptions about the form of the system Mueller matrix that limit the generality of the method or require long observations of a polarized source which is time-consuming for multiple PAF beams. This thesis introduces a more efficient method of calibration that uses only three snapshot observations of bright astronomical calibrator sources, one unpolarized and two partially polarized. The design of an engineering array for the Green Bank Telescope is discussed. Measured results from a prototype element are presented along with simulated on-reflector results for the full array. Simulations predict that the array will be the highest sensitivity dual pol feed built by the Radio Astronomy Systems group at Brigham Young University to date.

Subjects/Keywords: radio astronomy; phased array feeds; phased array antennas; polarimetric calibration; active impedances; beamforming; electromagnetics; Electrical and Computer Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Webb, T. D. (2012). Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4320&context=etd

Chicago Manual of Style (16^th Edition):

Webb, Taylor D. “Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy.” 2012. Masters Thesis, Brigham Young University. Accessed March 08, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4320&context=etd.

MLA Handbook (7^th Edition):

Webb, Taylor D. “Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy.” 2012. Web. 08 Mar 2021.

Vancouver:

Webb TD. Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy. [Internet] [Masters thesis]. Brigham Young University; 2012. [cited 2021 Mar 08]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4320&context=etd.

Council of Science Editors:

Webb TD. Design and Polarimetric Calibration of Dual-Polarized Phased Array Feeds for Radio Astronomy. [Masters Thesis]. Brigham Young University; 2012. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4320&context=etd

University of Oklahoma

10. Nai, Feng. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/48164

► As the Weather Surveillance Radar 1988 Doppler network reaches the end of its expected life, a network of multifunction phased-array radars (MPAR) supporting both aircraft… (more)

▼ As the Weather Surveillance Radar 1988 Doppler network reaches the end of its expected life, a network of multifunction phased-array radars (MPAR) supporting both aircraft and weather surveillance missions has been proposed. A phased-array system should match the sensitivity, spatial resolution, and data quality of the WSR-88D while having a update time of 60 seconds for weather surveillance. Since an MPAR system must complete both weather and aircraft surveillance missions, the update time reduction provided by having multiple faces is insufficient to achieve the desired 60 second update time for weather surveillance. Therefore, it is likely that multiple simultaneous beams would be needed per face to meet the timeline requirements. An approach to achieve multiple receive beams is to use a spoiled transmit beam and to form a cluster of simultaneous receive beams. However, a significant challenge for this approach is the potential of high sidelobe levels in the two-way radiation pattern, which can result in significantly biased estimates of the radar variables in situations where the signal power has large spatial variation. This dissertation proposes an adaptive beamspace algorithm designed for phased-array weather radar that utilizes a spoiled transmit beam and a cluster of simultaneous receive beams to achieve the desired timeline. Taking advantage of the adaptive algorithm's ability to automatically adjust sidelobe levels to match the scene, the high-sidelobe problem associated with a spoiled transmit beam is mitigated. Through extensive simulations, it is shown that adaptive beamspace processing can produce accurate and calibrated estimates of weather radar variables. Furthermore, it is demonstrated that the adaptive beamspace algorithm can automatically reject interference signals and reduce their impact on the radar-variable estimates. Additionally, it is shown that, despite higher sidelobe levels, the adaptive beamspace algorithm can perform similarly to a conventional system based on a dish antenna in terms of biases when reflectivity gradients are present. Finally, the adaptive beamspace algorithm is shown to compare favorably to some alternative solutions that can also achieve the desired MPAR timeline requirement while preserving data quality. Advisors/Committee Members: Palmer, Robert (advisor), Torres, Sebastian (advisor), Goodman, Nathan (committee member), Yu, Tian-You (committee member), Wang, Xuguang (committee member).

Subjects/Keywords: Adaptive Beamforming; Phased-Array Radar; Weather Radar; Beamspace

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APA (6^th Edition):

Nai, F. (2017). On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/48164

Chicago Manual of Style (16^th Edition):

Nai, Feng. “On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/48164.

MLA Handbook (7^th Edition):

Nai, Feng. “On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.” 2017. Web. 08 Mar 2021.

Vancouver:

Nai F. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/48164.

Council of Science Editors:

Nai F. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/48164

Penn State University

11. Desai, Kunj Jigish. Novel Circular Ring Phased Array Antenna Design.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/23676

► The aim of this thesis was to develop a novel design for a phased array antenna especially considering a circular geometry at 50 MHz, while… (more)

Subjects/Keywords: Phased Array FEKO MATLAB Antenna OWA Yagi Radar

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APA (6^th Edition):

Desai, K. J. (2014). Novel Circular Ring Phased Array Antenna Design. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/23676

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Desai, Kunj Jigish. “Novel Circular Ring Phased Array Antenna Design.” 2014. Thesis, Penn State University. Accessed March 08, 2021. https://submit-etda.libraries.psu.edu/catalog/23676.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Desai, Kunj Jigish. “Novel Circular Ring Phased Array Antenna Design.” 2014. Web. 08 Mar 2021.

Vancouver:

Desai KJ. Novel Circular Ring Phased Array Antenna Design. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 08]. Available from: https://submit-etda.libraries.psu.edu/catalog/23676.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Desai KJ. Novel Circular Ring Phased Array Antenna Design. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/23676

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

12. Masiunas, Lauren. Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar.

Degree: University of Massachusetts

URL: https://scholarworks.umass.edu/masters_theses_2/101

► This thesis describes the deployment of MIRSL's X-band dual-polarization Phase-Tilt Weather Radar (PTWR) at the University of Texas at Arlington during spring 2014. While… (more)

Subjects/Keywords: Phased array; Weather radar

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APA (6^th Edition):

Masiunas, L. (n.d.). Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar. (Thesis). University of Massachusetts. Retrieved from https://scholarworks.umass.edu/masters_theses_2/101

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Masiunas, Lauren. “Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar.” Thesis, University of Massachusetts. Accessed March 08, 2021. https://scholarworks.umass.edu/masters_theses_2/101.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Masiunas, Lauren. “Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar.” Web. 08 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Masiunas L. Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar. [Internet] [Thesis]. University of Massachusetts; [cited 2021 Mar 08]. Available from: https://scholarworks.umass.edu/masters_theses_2/101.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Masiunas L. Deployment and Monitoring of an X-Band Dual-Polarization Phased Array Weather Radar. [Thesis]. University of Massachusetts; Available from: https://scholarworks.umass.edu/masters_theses_2/101

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

University of Oklahoma

13. Supinie, Timothy. FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/324342

► With the US National Weather Service (NWS) Weather Surveillance Radar-1988 Doppler (WSR-88D) radar network aging, a candidate for replacing it is phased array radar (PAR).… (more)

▼ With the US National Weather Service (NWS) Weather Surveillance Radar-1988 Doppler (WSR-88D) radar network aging, a candidate for replacing it is phased array radar (PAR). The defining feature of PAR is an electronically steered beam, which allows for much faster volumetric updates than the mechanically steered beam from the WSR-88Ds. The higher temporal resolution afforded by PAR could be useful for initializing convective-scale numerical forecasts for purposes of issuing warnings based on forecasts of severe convective hazards, rather than on detection. The purpose of this work is to evaluate the performance of PAR versus the current operational WSR-88Ds in this context. Data collected during two supercell severe weather events in central Oklahoma are used in two sets of ensemble data assimilation (DA) and forecast experiments. The first case is the 22 May 2011 Ada, Oklahoma supercell. These experiments use 40 ensemble members at 2 km grid spacing and a 4-dimensional ensemble square root filter (4D EnSRF). The Advanced Regional Prediction System (ARPS) is used for the forecast model. The WSR-88D elevations are grouped into 1-minute batches to compare to the 1-minute PAR volumes. For this case, after 30 minutes of DA, the experiment using PAR data outperformed the experiment with WSR-88D data in the placement and rough intensity of the mesocyclone track and using several objective performance metrics, such as equitable threat score (ETS) and area under the relative operator characteristic (ROC) curve (AUC). After 45 minutes of DA, the advantage of PAR over the WSR-88D is reduced, suggesting that PAR data are most beneficial when the DA period must be short, perhaps to quickly spin up a storm in the ensemble. This would afford a longer lead time for a severe weather warning. A supplemental experiment using PAR data thinned in elevation angles to imitate the WSR-88D data batches confirms that the advantage is due to the extra data volumes provided by the PAR. The second case is the 31 May 2013 El Reno, Oklahoma supercell. The data processing for the WSR-88D and 1-minute PAR data is nearly identical to the 21 May 2011 case. For these experiments, the 4D EnSRF is used with the Weather Resesarch and Forecasting (WRF) forecast model. 36 members at 1 km grid spacing are used. In this case, the PAR experiment results in stronger mesocyclones because of a stronger mid-level temperature perturbation. Examination of the analysis increments by PAR volume reveals that in the default experiment, only the first 3 PAR volumes provide significant changes to the ensemble state. This is because the reflectivity innovation is reduced by having updated previous volumes, and an experiment with additional covariance inflation between PAR volumes is run that confirms this. In order to alleviate this, experiments are conducted assimilating the radar volumes in different orders, such as reversed, starting from the analysis time and working towards the edges of the DA window (“inside out”) and the reverse of that (“outside in”). The results… Advisors/Committee Members: Xue, Ming (advisor), Jung, Youngsun (committee member), Shapiro, Alan (committee member), Zhang, Guifu (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Data Assimilation; Phased Array Radar; Numerical Weather Prediction

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APA (6^th Edition):

Supinie, T. (2020). FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/324342

Chicago Manual of Style (16^th Edition):

Supinie, Timothy. “FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/324342.

MLA Handbook (7^th Edition):

Supinie, Timothy. “FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES.” 2020. Web. 08 Mar 2021.

Vancouver:

Supinie T. FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/324342.

Council of Science Editors:

Supinie T. FOUR-DIMENSIONAL ENSEMBLE KALMAN FILTER ASSIMILATION OF HIGH TEMPORAL RESOLUTION PHASED ARRAY RADAR DATA WITH REAL CONVECTIVE STORM CASES. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/324342

Michigan Technological University

14. Cummings, Ian Thomas. PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES.

Degree: MS, Department of Electrical and Computer Engineering, 2017, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/326

► The development of simultaneous transmit and receive capabilities is on the cutting-edge of research in phased array technology [1, 2, 3]. The large disparity… (more)

Subjects/Keywords: radar; simultaneous transmit and receive; phased array; beamforming; genetic algorithm; self interference; Signal Processing

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APA (6^th Edition):

Cummings, I. T. (2017). PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/326

Chicago Manual of Style (16^th Edition):

Cummings, Ian Thomas. “PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES.” 2017. Masters Thesis, Michigan Technological University. Accessed March 08, 2021. https://digitalcommons.mtu.edu/etdr/326.

MLA Handbook (7^th Edition):

Cummings, Ian Thomas. “PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES.” 2017. Web. 08 Mar 2021.

Vancouver:

Cummings IT. PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES. [Internet] [Masters thesis]. Michigan Technological University; 2017. [cited 2021 Mar 08]. Available from: https://digitalcommons.mtu.edu/etdr/326.

Council of Science Editors:

Cummings IT. PERFORMANCE SIMULATION AND OPTIMIZATION OF A SIMULTANEOUS TRANSMIT AND RECEIVE PHASED ANTENNA ARRAY USING ADAPTIVE BEAMFORMING AND GENETIC ALGORITHM TECHNIQUES. [Masters Thesis]. Michigan Technological University; 2017. Available from: https://digitalcommons.mtu.edu/etdr/326

University of Oklahoma

15. Saeidi Manesh, Hadi. HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/319597

► There are interest and practical value in utilizing polarization diversity for a radar to obtain more target information or for a communication system to carry… (more)

▼ There are interest and practical value in utilizing polarization diversity for a radar to obtain more target information or for a communication system to carry more signal information without occupying more frequency band. This is because frequency bands are getting crowded in microwave frequencies due to the recent advancements in cellular communications. For example, the Spectrum Efficient National Surveillance Radar Program (SENSR) is started to study the feasibility of replacing the four radar networks that service the U.S with a single network of Multifunction Phased Array Radar (MPAR). Candidates being considered for future MPAR include Cylindrical Polarimetric Phased Array Radar (CPPAR), and Planar Polarimetric Phased Array Radar (PPPAR). To have the desired accurate weather measurements with a PPPAR or CPPAR, a high-performance phased array antenna with dual-polarization capability is required. The array antenna is required to possess matched main beams, high input isolation, and low cross-polarization level at broadside and scan angles up to 45◦. The beam mismatch should be within 5% of the beamwidth, the input isolation needs to be better than 40 dB, and to have ZDR bias of less than 0.2 dB, the cross-polarization level along beam axis needs to be lower than -20 dB and -40 dB for alternate and simultaneous transmission, respectively. These are very stringent requirements for antenna design and development. The primary objective of this dissertation is to propose high-performance dual-polarized antenna arrays with high input isolation and low cross-polarization level for multifunction phased radar application. To do so, four different types of dual-polarized microstrip patch antenna arrays are presented. In the proposed patch antennas, different feeding techniques such as, aperture coupling method, balanced feed method and the combination of these methods which is called hybrid feeding technique are used. The proposed antenna arrays in this dissertation are configured according to image configuration for improving the cross-polarization level. The issues and challenges of implementing image arrangement is discussed, and precise procedure for design and predicting the final array radiation characteristics is proposed. The CPPAR demonstrator antenna is redesigned to achieve matched horizontal and vertical polarization beam pointing angels. A method of beam matching between two linearly polarized radiation patterns of a dual-polarized frequency scanning antenna is proposed, implemented, and tested. A meticulous phase match process between the outputs of both individual cells and the whole corresponding horizontal and vertical feed lines is carried out. To verify the simulation results and to take the coupling effect into account, the radiation patterns of an isolated column, as well as those of three columns, are measured. In agreement with the design and simulation results, horizontal and vertical polarization beams with a pointing angle mismatch of less than ±0.2◦ within the resonant frequency… Advisors/Committee Members: Zhang, Guifu (advisor), Hong, Yang (committee member), Sigmarsson, Hjalti (committee member), Doviak, Richard (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Engineering, Electronics and Electrical.; Dual Polarization; Antenna; Phased Array Radar; Microstrip Patch Antenna

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APA (6^th Edition):

Saeidi Manesh, H. (2019). HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319597

Chicago Manual of Style (16^th Edition):

Saeidi Manesh, Hadi. “HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/319597.

MLA Handbook (7^th Edition):

Saeidi Manesh, Hadi. “HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION.” 2019. Web. 08 Mar 2021.

Vancouver:

Saeidi Manesh H. HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/319597.

Council of Science Editors:

Saeidi Manesh H. HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/319597

The Ohio State University

16. Cao, Siyang. Radar Sensing Based on Wavelets.

Degree: PhD, Electrical and Computer Engineering, 2014, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1416996784

► Radar waveform design is an active research area for decades. With the advent of advanced digital signal processing, high speed computing, high frequency electronics, and… (more)

▼ Radar waveform design is an active research area for decades. With the advent of advanced digital signal processing, high speed computing, high frequency electronics, and solid state power amplifiers, emerging radar systems (such as UWB radar, multiple-input and multiple-output (MIMO) radar, cognitive radar, etc.) are expecting more from their waveforms. Taking advantage of the new techniques, scientists and engineers are able to implement new waveforms to achieve significantly better performance for conventional radar systems, namely target detection including range, speed, and shape. The objective of this dissertation is to exploit a practical way to build flexible waveforms for the modern radar.On the other hand, conventional radar systems detect targets or pixels of an area individually. Each target or pixel generates a set of data in real-time, which must be recorded for off-line processing. When the number of elements is increased, phased array radar is able to generate narrow beams, which can detect more targets or cover larger areas for data collection in high definition. The disadvantage is the increased time in sensing since narrow beams need more time to cover the same area than wider beams. To address this issue, the sensing mechanism needs to be studied. The objective of this dissertation is to exploit a new sensing mechanism, named transform sensing, to cover wider areas, tracking more moving objects, and providing high resolution of the target area with limited times of sensing. Because the waveform design and transform sensing in this dissertation are all based on wavelets, the dissertation introduces the wavelet basics. Then the wavelet based waveform is presented. This waveform is generated by concatenating wavelet packets, and can suppress range sidelobes more effectively than the tranditional Linear Frequency Modulated (LFM) waveform. In addition, the wavelet based waveform can de-couple its envelope and carrier for range and velocity estimations, respectively, because of which the speed detection and range detection using the proposed waveform is more stable for high speed targets than the LFM waveform. Consequently, the wavelet based waveform produces higher accuracy (and resolution) in range or velocity detection. The wavelet based waveform can be applied to the Synthetic Aperture Radar (SAR) for improved performance. The range and velocity detection is directly associated with range and azimuth detection for the stripmap SAR, we further compare the wavelet based waveform with the traditional LFM in the stripmap SAR simulation.On the other hand, this dissertation discusses the feasibility of transform sensing using wavelets. First, the way in which different sensing patterns can be formed and achieve a coarse-to-detail spatial resolution is dicussed. Then, realization of different sensing patterns by the phased array is discussed in detail. Because the transform sensing is feasible to be realized by the state of the art technique, a simulation generating wavelets for different sensing patterns… Advisors/Committee Members: Zheng, Yuan (Advisor).

Subjects/Keywords: Electrical Engineering; Remote Sensing; Radar Waveform, Pulse Compression Waveform, Wavelets, Phased Array

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APA (6^th Edition):

Cao, S. (2014). Radar Sensing Based on Wavelets. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1416996784

Chicago Manual of Style (16^th Edition):

Cao, Siyang. “Radar Sensing Based on Wavelets.” 2014. Doctoral Dissertation, The Ohio State University. Accessed March 08, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1416996784.

MLA Handbook (7^th Edition):

Cao, Siyang. “Radar Sensing Based on Wavelets.” 2014. Web. 08 Mar 2021.

Vancouver:

Cao S. Radar Sensing Based on Wavelets. [Internet] [Doctoral dissertation]. The Ohio State University; 2014. [cited 2021 Mar 08]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1416996784.

Council of Science Editors:

Cao S. Radar Sensing Based on Wavelets. [Doctoral Dissertation]. The Ohio State University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1416996784

Colorado State University

17. Morin, Alexander. System design and development of Front-X: an X-band dual-polarization phased array weather radar.

Degree: MS(M.S.), Electrical and Computer Engineering, 2019, Colorado State University

URL: http://hdl.handle.net/10217/195313

► The electronic beam steering capability of phased array weather radars has the potential to improve the temporal resolution of meteorological data and enable the development… (more)

Subjects/Keywords: mechanical beam steering; system control; electronic beam steering; weather radar; phased array

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APA (6^th Edition):

Morin, A. (2019). System design and development of Front-X: an X-band dual-polarization phased array weather radar. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/195313

Chicago Manual of Style (16^th Edition):

Morin, Alexander. “System design and development of Front-X: an X-band dual-polarization phased array weather radar.” 2019. Masters Thesis, Colorado State University. Accessed March 08, 2021. http://hdl.handle.net/10217/195313.

MLA Handbook (7^th Edition):

Morin, Alexander. “System design and development of Front-X: an X-band dual-polarization phased array weather radar.” 2019. Web. 08 Mar 2021.

Vancouver:

Morin A. System design and development of Front-X: an X-band dual-polarization phased array weather radar. [Internet] [Masters thesis]. Colorado State University; 2019. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10217/195313.

Council of Science Editors:

Morin A. System design and development of Front-X: an X-band dual-polarization phased array weather radar. [Masters Thesis]. Colorado State University; 2019. Available from: http://hdl.handle.net/10217/195313

Oregon State University

18. Garg, Robin. Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS.

Degree: MS, Electrical and Computer Engineering, 2016, Oregon State University

URL: http://hdl.handle.net/1957/59208

► This work presents the design and implementation of a low power phased-array receiver frontend at 28 GHz in 65 nm CMOS. The frontend incorporates a… (more)

Subjects/Keywords: Phased-array Receivers; Phased array antennas

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APA (6^th Edition):

Garg, R. (2016). Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59208

Chicago Manual of Style (16^th Edition):

Garg, Robin. “Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS.” 2016. Masters Thesis, Oregon State University. Accessed March 08, 2021. http://hdl.handle.net/1957/59208.

MLA Handbook (7^th Edition):

Garg, Robin. “Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS.” 2016. Web. 08 Mar 2021.

Vancouver:

Garg R. Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1957/59208.

Council of Science Editors:

Garg R. Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59208

University of Washington

19. Zhang, Ce. Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment.

Degree: PhD, 2016, University of Washington

URL: http://hdl.handle.net/1773/37108

► The focus of my research interests lies in the application of microwave antenna array system and array signal processing techniques to problems in wireless power… (more)

▼ The focus of my research interests lies in the application of microwave antenna array system and array signal processing techniques to problems in wireless power transmission and radar imaging. The two research areas share the same underlying mathematical principle of time reversality of electromagnetic wave propagation. Based on this principle, the array antenna system and the associated signal processing algorithm are further improved to adapt to different scenarios. In my dissertation, the rest part presents an optimal algorithm for wireless power trans- mission with beamforming array. The optimal weight distribution on antenna array elements is found based on time reversal eigenmode technique. Our method is adaptive to the medium of the channel and can be applied to arbitrarily positioned antenna without degradation of efficiency. This novel method is analytically studied and verified with numerical electromagnetic simulations. The second part presents a new problem called "Hard-Wall Radar Imaging" (HWRI) has been proposed when the electromagnetic waves cannot penetrate the shielding walls (such as metallic walls). The research methodology involves algorithm development combined with experimental results to gain more insights into the real microwave imaging system. First, we implemented the imaging system with the conventional time reversal DORT (Decomposition of Time-Reversal Operator) imaging algorithm and adapted it into a new signal processing technique (multiplicative array technique) to obtain the image in the proposed scenario. Second, after having identified the drawbacks of the rest imaging system, the imaging system is improved to distributed MIMO radar configuration. The new imaging algorithm is also developed based on the techniques of Direction-of-Arrival(DoA) estimation and adaptive nulling. From this algorithm, the experimental results show that the new imaging system can localize two targets correctly. To resolve the problem of spurious clutter reflection, a new unidirectional UWB antenna is developed using the technique crossed dipoles and integrated into a dual linear polarized array for the application of high-resolution two-dimensional imaging. Advisors/Committee Members: Kuga, Yasuo (advisor).

Subjects/Keywords: Antenna Array; Electromagnetics; Microwave Imaging; Phased Array; Radar; Wireless Power Transmission; Engineering; Electromagnetics; Electrical engineering; electrical engineering

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APA (6^th Edition):

Zhang, C. (2016). Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/37108

Chicago Manual of Style (16^th Edition):

Zhang, Ce. “Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment.” 2016. Doctoral Dissertation, University of Washington. Accessed March 08, 2021. http://hdl.handle.net/1773/37108.

MLA Handbook (7^th Edition):

Zhang, Ce. “Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment.” 2016. Web. 08 Mar 2021.

Vancouver:

Zhang C. Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment. [Internet] [Doctoral dissertation]. University of Washington; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1773/37108.

Council of Science Editors:

Zhang C. Applications of Microwave Antenna Array for Wireless Power Transmission and Radar Imaging in Complex Environment. [Doctoral Dissertation]. University of Washington; 2016. Available from: http://hdl.handle.net/1773/37108

University of Oklahoma

20. Le, Khoi Duc. SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER.

Degree: PhD, 2009, University of Oklahoma

URL: http://hdl.handle.net/11244/318836

► Phased array radars are attractive for weather surveillance primarily because of their capacity for extremely rapid scanning through electronic steering. When combined with the recently… (more)

▼ Phased array radars are attractive for weather surveillance primarily because of their capacity for extremely rapid scanning through electronic steering. When combined with the recently developed beam multiplexing technique, these radars can provide significantly improved update rates, which are necessary for monitoring rapidly evolving severe weather. A consequence of beam multiplexing, however, is that a small number of contiguous time series samples are typically used, creating a significant challenge for temporal/spectral filters typically used for clutter mitigation. As a result, the accurate extraction of weather products can become the limiting performance barrier for phased array radars that employ beam multiplexing in clutter-contaminated scattered fields. By exploiting the spatial correlation among the signals from the elements of the phased array antenna, the effect of clutter contamination can be reduced through a processed called spatial filtering . In contrast to conventional temporal filtering, spatial filtering is used to adaptively adjust the antenna beam pattern to produce lower gain in the directions of the undesired clutter signals. In this dissertation, the effect of clutter mitigation using spatial filtering was studied using numerical simulations of a tornadic environment and an array antenna configuration similar to the NSSL NWRT Phased Array Radar for changes in signal-to-noise ratio, clutter-to-signal ratio, number of time series samples, and diagonal loading for three types of clutter sources that include nearly stationary ground clutter, moving targets such as aircraft, and wind turbine clutter, which has recently been documented to be increasingly problematic for radars. Since such data are not currently available from a horizontally pointed phased array weather radar, experimental validation was applied to an existing data set from the Turbulent Eddy Profiler (TEP) developed at University of Massachusetts, which is a vertically pointed phased array radar. Results will show that spatial filtering holds promise for the future of phased array radars for the observation of the weather in a clutter environment. Advisors/Committee Members: Palmer, Robert (advisor).

Subjects/Keywords: Beamforming; Phased array antennas; Radar meteorology; Radar – Interference

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APA (6^th Edition):

Le, K. D. (2009). SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318836

Chicago Manual of Style (16^th Edition):

Le, Khoi Duc. “SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER.” 2009. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/318836.

MLA Handbook (7^th Edition):

Le, Khoi Duc. “SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER.” 2009. Web. 08 Mar 2021.

Vancouver:

Le KD. SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER. [Internet] [Doctoral dissertation]. University of Oklahoma; 2009. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/318836.

Council of Science Editors:

Le KD. SPATIAL FILTERING OF CLUTTER USING PHASED ARRAY RADARS FOR OBSERVATIONS OF THE WEATHER. [Doctoral Dissertation]. University of Oklahoma; 2009. Available from: http://hdl.handle.net/11244/318836

University of Oklahoma

21. Curtis, Christopher David. EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR.

Degree: PhD, 2009, University of Oklahoma

URL: http://hdl.handle.net/11244/318962

► Weather radar researchers have long been eager to exploit the capabilities of phased array antennas, but high cost and technical complexity have postponed their widespread… (more)

▼ Weather radar researchers have long been eager to exploit the capabilities of phased array antennas, but high cost and technical complexity have postponed their widespread use in radar meteorology. With the aging of the current network of operational Doppler weather radars, the possibility of replacing them with phased array radars has renewed interest in applying this technology to weather radar research. The main focus of this research is the "agile beam" or electronic scanning capability of phased array antennas. Three research areas that take advantage of this agile beam capability are addressed in this work: spectral characterization of ground clutter with phased array radar data, staggered PRT beam multiplexing (SBMX), and rapid weather detection. Most of the research on ground clutter filtering has been applied to rotating antennas, but the agile beam capability of the phased array allows the collection of data with a stationary antenna. Studying the characteristics of ground clutter spectra for a stationary antenna could lead to new techniques and improvements for clutter filtering with phased arrays. Ground clutter data were collected under varying wind conditions, foliage levels, and terrain types. The shapes of the ground clutter spectra are then characterized using a novel quadratic clutter model, and the dependence of the model parameters on different conditions is explored. The model is then applied to the examination of clutter width and the time series simulation of ground clutter. SBMX takes advantage of the ability of the phased array to scan the beam in a different direction on a pulse-to-pulse basis which can save time by collecting samples that are nearly independent. SBMX is compared to two conventional scanning strategies to assess its performance using both simulations and real data. It performs well at high signal-to-noise ratios and narrow spectrum widths, but the staggered PRT strategy performs comparably to SBMX, takes less time, and has proven strategies for clutter filtering. The last area of research, rapid weather detection, looks at the use of beam multiplexing to improve the detection of weather signatures. A simple beam multiplexing strategy outperforms a contiguous pulse strategy because the probability of detection of weather signatures is constant for beam multiplexing while the probability of detection for contiguous pulses decreases at narrow spectrum widths. The effects of beam broadening on the scanning strategies are also examined. Advisors/Committee Members: Yu, Tian-You (advisor).

Subjects/Keywords: Radar meteorology; Phased array antennas; Radar – Interference

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APA (6^th Edition):

Curtis, C. D. (2009). EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318962

Chicago Manual of Style (16^th Edition):

Curtis, Christopher David. “EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR.” 2009. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/318962.

MLA Handbook (7^th Edition):

Curtis, Christopher David. “EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR.” 2009. Web. 08 Mar 2021.

Vancouver:

Curtis CD. EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR. [Internet] [Doctoral dissertation]. University of Oklahoma; 2009. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/318962.

Council of Science Editors:

Curtis CD. EXPLORING THE CAPABILITIES OF THE AGILE BEAM PHASED ARRAY WEATHER RADAR. [Doctoral Dissertation]. University of Oklahoma; 2009. Available from: http://hdl.handle.net/11244/318962

Colorado State University

22. Thompson, Elizabeth Jennifer. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.

Degree: MS(M.S.), Atmospheric Science, 2012, Colorado State University

URL: http://hdl.handle.net/10217/72363

► The nation-wide WSR-88D radar network is currently being upgraded for dual-polarized technology. While many convective, warm-season fuzzy-logic hydrometeor classification algorithms based on this new suite… (more)

▼ The nation-wide WSR-88D radar network is currently being upgraded for dual-polarized technology. While many convective, warm-season fuzzy-logic hydrometeor classification algorithms based on this new suite of radar variables and temperature have been refined, less progress has been made thus far in developing hydrometeor classification algorithms for winter precipitation. Unlike previous studies, the focus of this work is to exploit the discriminatory power of polarimetric variables to distinguish the most common precipitation types found in winter storms without the use of temperature as an additional variable. For the first time, detailed electromagnetic scattering of plates, dendrites, dry aggregated snowflakes, rain, freezing rain, and sleet are conducted at X-, C-, and S-band wavelengths. These physics-based results are used to determine the characteristic radar variable ranges associated with each precipitation type. A variable weighting system was also implemented in the algorithm's decision process to capitalize on the strengths of specific dual-polarimetric variables to discriminate between certain classes of hydrometeors, such as wet snow to indicate the melting layer. This algorithm was tested on observations during three different winter storms in Colorado and Oklahoma with the dual-wavelength X- and S-band CSU-CHILL, C-band OU-PRIME, and X-band CASA IP1 polarimetric radars. The algorithm showed success at all three frequencies, but was slightly more reliable at X-band because of the algorithm's strong dependence on specific differential phase. While plates were rarely distinguished from dendrites, the latter were satisfactorily differentiated from dry aggregated snowflakes and wet snow. Sleet and freezing rain could not be distinguished from rain or light rain based on polarimetric variables alone. However, high-resolution radar observations illustrated the refreezing process of raindrops into ice pellets, which has been documented before but not yet explained. Persistent, robust patterns of decreased correlation coefficient, enhanced differential reflectivity, and an inflection point around enhanced reflectivity occurred over the exact depth of the surface cold layer indicated by atmospheric soundings during times when sleet was reported at the surface. It is hypothesized that this refreezing signature is produced by a modulation of the drop size distribution such that smaller drops preferentially freeze into ice pellets first. The melting layer detection algorithm and fall speed spectra from vertically pointing radar also captured meaningful trends in the melting layer depth, height, and mean correlation coefficient during this transition from freezing rain to sleet at the surface. These findings demonstrate that this new radar-based winter hydrometeor classification algorithm is applicable for both research and operational sectors. Advisors/Committee Members: Rutledge, Steven A. (advisor), Dolan, Brenda (committee member), Chandrasekar, V. (committee member), van den Heever, Susan (committee member).

Subjects/Keywords: winter; algorithm; radar; polarimetric

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APA (6^th Edition):

Thompson, E. J. (2012). Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/72363

Chicago Manual of Style (16^th Edition):

Thompson, Elizabeth Jennifer. “Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.” 2012. Masters Thesis, Colorado State University. Accessed March 08, 2021. http://hdl.handle.net/10217/72363.

MLA Handbook (7^th Edition):

Thompson, Elizabeth Jennifer. “Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.” 2012. Web. 08 Mar 2021.

Vancouver:

Thompson EJ. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10217/72363.

Council of Science Editors:

Thompson EJ. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/72363

Penn State University

23. Loeffler, Scott David. Dual-polarization signatures in nonsupercell tornadic storms.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14344swl5295

► Tornadoes associated with nonsupercell storms present unique challenges for forecasters. These tornadic storms, although often not as violent or deadly as supercells, occur disproportionately during… (more)

▼ Tornadoes associated with nonsupercell storms present unique challenges for forecasters. These tornadic storms, although often not as violent or deadly as supercells, occur disproportionately during the overnight hours and the cool season, times when the public is more vulnerable. Additionally, there is significantly lower warning skill for these nonsupercell tornadoes compared to supercell tornadoes. Thus, these storms warrant further attention. This study utilizes dual-polarization WSR-88D radar data to analyze nonsupercell tornadic storms over a three-and-a-half-year period focused on the mid-Atlantic and southeastern United States. The analysis reveals three repeatable signatures: the separation of specific differential phase (KDP) and differential reflectivity (ZDR) enhancement regions owing to size sorting, the descent of high KDP values preceding intensification of the low-level rotation, and rearward movement of the KDP enhancement region prior to tornadogenesis. This study employs a new method to define the ``separation vector," comprising the distance separating the enhancement regions and the direction from the KDP enhancement region to the ZDR enhancement region, measured relative to storm motion. The median separation distance between the enhancement regions is found to be around 4 km and tends to maximize around the time of tornadogenesis. A preferred quadrant for separation direction is found to be between parallel to and 90 degrees to the right of storm motion. Furthermore, it is shown that, for a given separation distance, the storm-relative helicity increases as the separation direction increases from 0 degrees toward 90 degrees. Discussions on the implications of the other two signatures (i.e., descending high KDP values and rearward movement of KDP enhancement regions) are presented, although higher temporal resolution data are crucial for further analysis of these signatures. Advisors/Committee Members: Matthew Robert Kumjian, Thesis Advisor/Co-Advisor, Paul Markowski, Committee Member, Yvette Pamela Richardson, Committee Member.

Subjects/Keywords: Severe storms; Radar; Polarimetric radar; Tornadoes

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APA (6^th Edition):

Loeffler, S. D. (2017). Dual-polarization signatures in nonsupercell tornadic storms. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14344swl5295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Loeffler, Scott David. “Dual-polarization signatures in nonsupercell tornadic storms.” 2017. Thesis, Penn State University. Accessed March 08, 2021. https://submit-etda.libraries.psu.edu/catalog/14344swl5295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Loeffler, Scott David. “Dual-polarization signatures in nonsupercell tornadic storms.” 2017. Web. 08 Mar 2021.

Vancouver:

Loeffler SD. Dual-polarization signatures in nonsupercell tornadic storms. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Mar 08]. Available from: https://submit-etda.libraries.psu.edu/catalog/14344swl5295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Loeffler SD. Dual-polarization signatures in nonsupercell tornadic storms. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/14344swl5295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

24. La Manna, Marco. HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING.

Degree: PhD, Department of Electrical and Computer Engineering, 2016, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/187

► The Hybrid MIMO Phased Array Radar (HMPAR) is a multi-sensor radar architecture that merges together the concepts of a traditional phased array radar with… (more)

▼ The Hybrid MIMO Phased Array Radar (HMPAR) is a multi-sensor radar architecture that merges together the concepts of a traditional phased array radar with the colocated Multiple-Input Multiple-Output (MIMO) radar. This radar system comprises a large number of transmit and receive elements, MP, organized into M sub-arrays of P elements each. The sub-arrays can be electronically steered in different directions and driven by separate transmit waveforms. Previous works focused on transmit signals strategies and beampatterns for two possible modes of operation (called Mode 1 and Mode 2). Here we concentrate on the receive signal processing algorithms and performance. Assuming that a non-moving, non-fluctuating target with an unknown complex target reflectivity is present in the field of view, we derive the Cramer-Rao Lower Bounds (CRLB), a performance bound on the variance of any unbiased target location estimator. In Mode 1, the HMPAR is used for broad beams and employs quasi-orthogonal signals. Results vary depending on the fluctuations of the beampattern. In Mode 2, the radar is used for narrower beampatterns and employs transmit signals which allow a rapid scan of the field of view in one pulse. In this case, when the sub-arrays are steered towards the true target location results show that the lowest CRLB values are obtained with low M and high P. When the HMPAR steers its beam towards the target’s presumed location, but the target is elsewhere, results vary depending on the size of the field of view. For both modes of operation, we describe potential target detection techniques, as well as providing a possible target location estimation algorithm. Specifically, by discretizing the field of view into N points, we determine the test statistic at each location and the location with the maximum value is considered the estimated target location. Afterwards, we compare the estimation algorithm performance against the CRLB. Results show that, as the SNR increases, the mean square error of the estimation algorithm reaches the performance bounds, provided by the CRLB. Advisors/Committee Members: Daniel Fuhrmann.

Subjects/Keywords: Hybrid Multiple-Input Multiple-Output Phased Array Radar; Cramer Rao Lower Bound; Receive Signal Processing; Signal Processing

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APA (6^th Edition):

La Manna, M. (2016). HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/187

Chicago Manual of Style (16^th Edition):

La Manna, Marco. “HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING.” 2016. Doctoral Dissertation, Michigan Technological University. Accessed March 08, 2021. https://digitalcommons.mtu.edu/etdr/187.

MLA Handbook (7^th Edition):

La Manna, Marco. “HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING.” 2016. Web. 08 Mar 2021.

Vancouver:

La Manna M. HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING. [Internet] [Doctoral dissertation]. Michigan Technological University; 2016. [cited 2021 Mar 08]. Available from: https://digitalcommons.mtu.edu/etdr/187.

Council of Science Editors:

La Manna M. HYBRID MIMO PHASED ARRAY RADAR RECEIVE SIGNAL PROCESSING. [Doctoral Dissertation]. Michigan Technological University; 2016. Available from: https://digitalcommons.mtu.edu/etdr/187

Osaka University

25. Wu, Ting. Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク.

Degree: 博士（工学）, 2013, Osaka University

URL: http://hdl.handle.net/11094/27592

博士（工学）

2013-03-25

大阪大学

14401甲第16431号

26217

Subjects/Keywords: lightning; narrow bipolar event; phased array radar

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APA (6^th Edition):

Wu, T. (2013). Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク. (Thesis). Osaka University. Retrieved from http://hdl.handle.net/11094/27592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wu, Ting. “Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク.” 2013. Thesis, Osaka University. Accessed March 08, 2021. http://hdl.handle.net/11094/27592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wu, Ting. “Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク.” 2013. Web. 08 Mar 2021.

Vancouver:

Wu T. Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク. [Internet] [Thesis]. Osaka University; 2013. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11094/27592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wu T. Observation of lightning narrow bipolar event with LF lightning location systems and phased array radar : LF帯雷放電標定装置とフェーズドアレイレーダを用いたNBPの観測; LFタイ　カミナリホウデン　ヒョウテイ　ソウチ　ト　フェーズドアレイレーダ　ヲ　モチイタ　NBP　ノ　カンソク. [Thesis]. Osaka University; 2013. Available from: http://hdl.handle.net/11094/27592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

26. Jensen, Jeffrey. A Cognitive Phased Array Using Smart Phone Control.

Degree: MS, Electrical Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10856

► Cognitive radio networks require the use of computational resources to reconfigure transmit/receive parameters to improve communication quality of service or efficiency. Recent emergence of smart… (more)

▼ Cognitive radio networks require the use of computational resources to reconfigure transmit/receive parameters to improve communication quality of service or efficiency. Recent emergence of smart phones has made these resources more accessible and mobile, combining sensors, geolocation, memory and processing power into a single device. Thus, this work examines an integration of a smart phone into a complex radio network that controls the beam direction of a phased array using a conventional method, but utilizes the phone's internal sensors as an enhancement to generate beam direction information, Bluetooth channel to relay information to control circuitry, and Global Position System (GPS) to track an object in motion. The research and experiments clearly demonstrate smart phone's ability to utilize internal sensors to generate information used to control beam direction from a phased array. Computational algorithms in a network of microcontrollers map this information into a DC bias voltage which is applied to individual phase shifters connected to individual array elements. To test algorithms and control theory, a 4 by 4 microstrip patch array is designed and fabricated to operate at a frequency of 2.4 GHz. Simulations and tests of the array provide successful antenna design results with satisfactory design parameters. Smart phone control circuitry is designed and tested with the array. Anechoic test results yield successful beam steering capability scanning 90 degrees at 15 degree intervals with 98% accuracy in all cases. In addition, the system achieves successful beam steering operable over a bandwidth of 100 MHz around resonance. Furthermore, these results demonstarate the capability of the smart phone controlled system to be used in testing further array formations to achieve beam steering in 3-Dimensional space. It is further noted that the system extends capabilities of integrating other control methods which use the smart phone to process information. Advisors/Committee Members: Huff, Gregory H. (advisor), Chamberland, Jean-Francois (committee member), Pfister, Henry (committee member), Hogan, Harry (committee member).

Subjects/Keywords: Phased Arrays; Phased Array Control; Smartphone

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APA (6^th Edition):

Jensen, J. (2012). A Cognitive Phased Array Using Smart Phone Control. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10856

Chicago Manual of Style (16^th Edition):

Jensen, Jeffrey. “A Cognitive Phased Array Using Smart Phone Control.” 2012. Masters Thesis, Texas A&M University. Accessed March 08, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10856.

MLA Handbook (7^th Edition):

Jensen, Jeffrey. “A Cognitive Phased Array Using Smart Phone Control.” 2012. Web. 08 Mar 2021.

Vancouver:

Jensen J. A Cognitive Phased Array Using Smart Phone Control. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10856.

Council of Science Editors:

Jensen J. A Cognitive Phased Array Using Smart Phone Control. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10856

Texas A&M University

27. By, Samantha. A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T.

Degree: MS, Biomedical Engineering, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/152543

► Breast cancer is the second leading cause of cancer death among females in the United States. Magnetic resonance imaging (MRI) has emerged as a powerful… (more)

▼ Breast cancer is the second leading cause of cancer death among females in the United States. Magnetic resonance imaging (MRI) has emerged as a powerful tool for detecting and evaluating the disease, with notable advantages over other modalities, and the advent of ultra-high field strength scanners promises even more potential. In comparison to standard clinical MRI field strengths (1.5, 3.0 tesla), breast MRI at 7T provides increased signal-to-noise ratio (SNR) and spectral resolution. These benefits, however, are accompanied by significant challenges in hardware design, limiting the availability of commercial radiofrequency coils for 7T. The primary objective of this work is to enable the study of breast cancer at 7T with the development of a 16-channel receive array coil. The use of array coils to receive is standard in clinical MRI, as it provides higher SNR over a field of view than a single coil. In this case, when combined with the increased sensitivity provided by the high field strength, this will enable the ability to acquire images with higher resolution than could be achieved at 3T or 1.5T in clinically standard scan times. This has the potential to improve the morphological characterization of tumors and their involvement in the surrounding tissues. This thesis discusses the design and construction of a 16-channel receive array insert, characterization of its performance as an array, and comparison of the achievable SNR to a transmit-receive quadrature volume coil. With the 16-channel receive array insert, the results demonstrate a 6.5 times improvement in mean SNR and the ability to accelerate up to a reduction factor of 9 with a mean g-factor of 1.3. Finally, we present initial in vivo images acquired with the array, demonstrating the utility of the array coil through higher resolution imaging than the current protocols at lower field strengths. Advisors/Committee Members: McDougall, Mary P (advisor), Wright, Steven M (committee member), Grunlan, Melissa A (committee member), Lenox, Mark (committee member).

Subjects/Keywords: 7T; breast MRI; phased array

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

By, S. (2014). A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152543

Chicago Manual of Style (16^th Edition):

By, Samantha. “A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T.” 2014. Masters Thesis, Texas A&M University. Accessed March 08, 2021. http://hdl.handle.net/1969.1/152543.

MLA Handbook (7^th Edition):

By, Samantha. “A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T.” 2014. Web. 08 Mar 2021.

Vancouver:

By S. A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1969.1/152543.

Council of Science Editors:

By S. A 16-Channel Receive Array Insert for Magnetic Resonance Imaging of the Breast at 7T. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152543

Brigham Young University

28. Newmeyer, Luke Oliver. Efficient FPGA SoC Processing Design for a Small UAV Radar.

Degree: MS, 2018, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8097&context=etd

► Modern radar technology relies heavily on digital signal processing. As radar technology pushes the boundaries of miniaturization, computational systems must be developed to support the… (more)

▼ Modern radar technology relies heavily on digital signal processing. As radar technology pushes the boundaries of miniaturization, computational systems must be developed to support the processing demand. One particular application for small radar technology is in modern drone systems. Many drone applications are currently inhibited by safety concerns of autonomous vehicles navigating shared airspace. Research in radar based Detect and Avoid (DAA) attempts to address these concerns by using radar to detect nearby aircraft and choosing an alternative flight path. Implementation of radar on small Unmanned Air Vehicles (UAV), however, requires a lightweight and power efficient design. Likewise, the radar processing system must also be small and efficient.This thesis presents the design of the processing system for a small Frequency Modulated Continuous Wave (FMCW) phased array radar. The radar and processing is designed to be light-weight and low-power in order to fly onboard a UAV less than 25 kg in weight. The radar algorithms for this design include a parallelized Fast Fourier Transform (FFT), cross correlation, and beamforming. Target detection algorithms are also implemented. All of the computation is performed in real-time on a Xilinx Zynq 7010 System on Chip (SoC) processor utilizing both FPGA and CPU resources.The radar system (excluding antennas) has dimensions of 2.25 x 4 x 1.5 in3, weighs 120 g, and consumes 8 W of power of which the processing system occupies 2.6 W. The processing system performs over 652 million arithmetic operations per second and is capable of performing the full processing in real-time. The radar has also been tested in several scenarios both airborne on small UAVs as well as on the ground. Small UAVs have been detected to ranges of 350 m and larger aircraft up to 800 m. This thesis will describe the radar design architecture, the custom designed radar hardware, the FPGA based processing implementations, and conclude with an evaluation of the system's effectiveness and performance.

Subjects/Keywords: Efficient Computing; Phased Array Radar; FMCW Radar; Digital Beamforming; FPGA; SoC; Xilinx Zynq; Heterogeneous Processing; Hardware Acceleration; Detect and Avoid; Sense and Avoid; Unmanned Air Vehicles; Drone Technology; Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Newmeyer, L. O. (2018). Efficient FPGA SoC Processing Design for a Small UAV Radar. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8097&context=etd

Chicago Manual of Style (16^th Edition):

Newmeyer, Luke Oliver. “Efficient FPGA SoC Processing Design for a Small UAV Radar.” 2018. Masters Thesis, Brigham Young University. Accessed March 08, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8097&context=etd.

MLA Handbook (7^th Edition):

Newmeyer, Luke Oliver. “Efficient FPGA SoC Processing Design for a Small UAV Radar.” 2018. Web. 08 Mar 2021.

Vancouver:

Newmeyer LO. Efficient FPGA SoC Processing Design for a Small UAV Radar. [Internet] [Masters thesis]. Brigham Young University; 2018. [cited 2021 Mar 08]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8097&context=etd.

Council of Science Editors:

Newmeyer LO. Efficient FPGA SoC Processing Design for a Small UAV Radar. [Masters Thesis]. Brigham Young University; 2018. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8097&context=etd

University of Oklahoma

29. Bukovcic, Petar. Polarimetric Measurements of Ice Pellets and Aggregated Snow.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52406

► The recent upgrade of the National Weather Service WSR-88D radar network to polarimetric capabilities provides the abundance of information about the precipitation microphysics. Even with… (more)

Subjects/Keywords: Winter Precipitation Measurements; Disdrometer; Polarimetric Radar

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APA (6^th Edition):

Bukovcic, P. (2017). Polarimetric Measurements of Ice Pellets and Aggregated Snow. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52406

Chicago Manual of Style (16^th Edition):

Bukovcic, Petar. “Polarimetric Measurements of Ice Pellets and Aggregated Snow.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/52406.

MLA Handbook (7^th Edition):

Bukovcic, Petar. “Polarimetric Measurements of Ice Pellets and Aggregated Snow.” 2017. Web. 08 Mar 2021.

Vancouver:

Bukovcic P. Polarimetric Measurements of Ice Pellets and Aggregated Snow. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/52406.

Council of Science Editors:

Bukovcic P. Polarimetric Measurements of Ice Pellets and Aggregated Snow. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52406

University of Oklahoma

30. May, Ryan Michael. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/13621

► Correction for rain attenuation is an important data quality issue when using data collected by radars operating at attenuating wavelengths, specifically C and X bands.… (more)

Subjects/Keywords: polarimetric radar; dual-polarization; attenuation; simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

May, R. M. (2014). Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/13621

Chicago Manual of Style (16^th Edition):

May, Ryan Michael. “Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed March 08, 2021. http://hdl.handle.net/11244/13621.

MLA Handbook (7^th Edition):

May, Ryan Michael. “Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.” 2014. Web. 08 Mar 2021.

Vancouver:

May RM. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11244/13621.

Council of Science Editors:

May RM. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/13621

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Open Access Theses and Dissertations