+publisher:"University of Oklahoma" +contributor:("Yeary, Mark")

University of Oklahoma

1. 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 January 23, 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. 23 Jan 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 Jan 23]. 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

University of Oklahoma

2. Islam, Shajid. Probe-based, quasi-near-field phased array calibration.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/326668

► Phased array technology provides remarkable scanning flexibility and spatial search capability for the multifunction radar system, airborne radar system, and many other applications. Recent years… (more)

Subjects/Keywords: Phased Array Calibration; Fast Calibration Technique; Quasi-Near-Field; Mutual Coupling

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APA (6^th Edition):

Islam, S. (2020). Probe-based, quasi-near-field phased array calibration. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/326668

Chicago Manual of Style (16^th Edition):

Islam, Shajid. “Probe-based, quasi-near-field phased array calibration.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/326668.

MLA Handbook (7^th Edition):

Islam, Shajid. “Probe-based, quasi-near-field phased array calibration.” 2020. Web. 23 Jan 2021.

Vancouver:

Islam S. Probe-based, quasi-near-field phased array calibration. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/326668.

Council of Science Editors:

Islam S. Probe-based, quasi-near-field phased array calibration. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/326668

University of Oklahoma

3. 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 January 23, 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. 23 Jan 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 Jan 23]. 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

University of Oklahoma

4. Lucking, David. Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/320358

► A sensor's performance is constrained by the amount of resources at its disposal and the utilization of those resources. A radar system, for example, has… (more)

▼ A sensor's performance is constrained by the amount of resources at its disposal and the utilization of those resources. A radar system, for example, has a limited amount of transmit power-aperture per unit time to track a multitude of targets. A typical approach when tracking multiple dynamic targets is to time interleave the update intervals until all the radar tasks are performed. The advent of more agile sensors, such as digital-at-every-element apertures, opens the possibility for dynamic sensor resource allocation strategies to achieve better tracking performance in target-dense, resource-constrained scenarios. With proper research into aperture allocation, such as the analysis provided in this dissertation, an all-digital radar can intelligently exploit the degrees of freedom offered by all-digital radars to increase tracking performance. In this dissertation, we investigate adaptive aperture allocation for tracking a large number of targets. The strategies are first introduced with a parallel, linear channel model, then increased in realism with a non-linear measurement model, and finally applied to a full tracking system. We derive various strategies for allocating power and aperture, and compare their performance based on tracking related metrics. Finally, we investigate the relationship between the aperture allocation strategies and the target locations for multiple scenarios designed to represent the environment for a radar tracking system. This research provides groundbreaking strategies for optimal radar aperture allocation using the digital-at-every-element architectures to reduce the overall system uncertainty and decrease the uncertainty on a per-target basis. Integrating aperture allocation with the management of other degrees of freedom will increase multi-target tracking performance well beyond the current state of the art. Advisors/Committee Members: Goodman, Nathan (advisor), Fulton, Caleb (committee member), Yeary, Mark (committee member), Antonio, John (committee member), Sigmarsson, Hjalti (committee member).

Subjects/Keywords: Digital Arrays; Multi-Target Tracking; Radar Modeling; Radar Resource Management; Radar Signal Processing

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

APA (6^th Edition):

Lucking, D. (2019). Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/320358

Chicago Manual of Style (16^th Edition):

Lucking, David. “Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/320358.

MLA Handbook (7^th Edition):

Lucking, David. “Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking.” 2019. Web. 23 Jan 2021.

Vancouver:

Lucking D. Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/320358.

Council of Science Editors:

Lucking D. Digital-At-Every-Element Radar Resource Allocation for Multi-Target Tracking. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/320358

University of Oklahoma

5. Lake, John. Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/319666

► The microwave band is well suited to wireless applications, including radar, communications, and electronic warfare. While radar operations currently have priority in a portion of… (more)

▼ The microwave band is well suited to wireless applications, including radar, communications, and electronic warfare. While radar operations currently have priority in a portion of the microwave band, wireless companies are lobbying to change that; such a change would force current operators into a smaller total bandwidth. Interference would occur, and has already occurred at the former National Weather Radar Testbed Phased Array Radar. The research in this dissertation was motivated by this interference – it occurred even without a change to radar's primacy in the microwave band. If microwave operations had to squeeze into a smaller overall bandwidth, such interference, whether originating from other radars or some other source, would only become more common. The radio frequency interference (RFI) present at the National Weather Radar Testbed Phased Array Radar altered the statistical properties at certain locations, causing targets to be erroneously detected. While harmless enough in clear air, it could affect National Weather Service decisions if it occurred during a weather event. The initial experiments, covered in Chapter 2, used data comprised of a single channel of in-phase and quadrature (IQ) data, reflecting the resources available to the National Weather Service's weather radar surveillance network. A new algorithm, the Interference Spike Detection Algorithm, was developed with these restrictions in mind. This new algorithm outperforms several interference detection algorithms developed by industry. Tests on this data examined algorithm performance quantitatively, using real and simulated weather data and radio frequency interference. Additionally, machine learning classification algorithms were employed for the first time to the RFI classification problem and it was found that, given enough resources, machine learning had the potential to perform even better than the other temporal algorithms. Subsequent experiments, covered in Chapter 3, used spatial data from phased arrays and looked at methods of interference mitigation that leveraged this spatial data. Specifically, adaptive beamforming techniques could be used to mitigate interference and improve data quality. A variety of adaptive digital beamforming techniques were evaluated in terms of their performance at interference mitigation for a communications task. Additionally, weather radar data contaminated with ground clutter was collected from the sidelobe canceller channels of the former National Weather Radar Testbed Phased Array Radar and, using the reasoning that ground clutter is simply interference from the ground, adaptive digital beamforming was successfully employed to mitigate the impact of ground clutter and restore the data to reflect the statistics of the underlying weather data. Tests on digital equalization, covered in Chapter 4, used data from a prototype receiver for Horus, a digital phased array radar under development at the University of Oklahoma. The data suffered from significant channel mismatch, which can… Advisors/Committee Members: Yeary, Mark (advisor), Fulton, Caleb (committee member), Goodman, Nathan (committee member), Sigmarsson, Hjalti (committee member), Homeyer, Cameron (committee member).

Subjects/Keywords: radio frequency interference; adaptive digital beamforming; digital equalization; radar

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APA (6^th Edition):

Lake, J. (2019). Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319666

Chicago Manual of Style (16^th Edition):

Lake, John. “Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/319666.

MLA Handbook (7^th Edition):

Lake, John. “Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality.” 2019. Web. 23 Jan 2021.

Vancouver:

Lake J. Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/319666.

Council of Science Editors:

Lake J. Temporal and Spatial Interference Mitigation Strategies to Improve Radar Data Quality. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/319666

University of Oklahoma

6. McDaniel, Jay. Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/301298

► The method in which the frequency spectrum is currently allocated is unsustainable. An increasing number of devices are becoming wireless, overcrowding an already crowded spectrum… (more)

▼ The method in which the frequency spectrum is currently allocated is unsustainable. An increasing number of devices are becoming wireless, overcrowding an already crowded spectrum (e.g., the ISM band). Therefore, future systems will be forced to move to higher frequencies in order to be allocated an unused slice of the spectrum and accumulate the desired/required bandwidth. Furthermore, with the continued desire to implement a multitude of sensors on unmanned aerial vehicles (UAVs), as well as the need for conformal small-cell repeaters for 5G communications, next generation systems will have to achieve unprecedented reductions in size, weight, power, and cost (SWaP-C). In order for future systems to become practical, several fundamental technological hurdles must be overcome including the development of low loss and highly integrated components used to build next generation systems. The RF/microwave filter is of particular interest, as it is not only crucial for conditioning the signal for transmission and/or digitization, but can also affect critical system parameters based on it's placement in the system. Due to the increased attenuative nature of the environment at microwave frequencies, the systems dynamic range will have to be maximized requiring an exceptionally low loss filter if placed close to the antenna in the receiver (Rx) chain, which is necessary for defense and adaptive/re-configurable systems. While low loss microwave filtering can be easily achieved using waveguide design techniques, it is much more difficult in a highly integrated planar design due to increased radiation and dielectric losses. A promising solution which minimizes these losses and offers a planar solution is the suspended integrated stripline (SISL) filter. In this research, a low loss fully-board integrated lowpass and highpass filter, using the suspended integrated stripline technology, are designed and studied, pushing the stat-of-the-art in planar filtering technologies. A multi-layer board stack-up, with internally buried hollowed cavities, is used to create the suspended stripline. The embedded filter is accessed through a co-planar waveguide-to-stripline vertical via transition and vice-versa. Simulated and measured results show that insertion losses of less than 1 dB are obtainable including the vertical via transition and associated trace losses. Compared to it's suspended substrate stripline (SSS) predecessor, the SISL filter is one order of magnitude smaller and lighter while achieving identical performance. Beyond the proposed filters, this technological solution can be applied to several other passive microwave components such as couplers, power dividers, and gain equalizers. The capabilities demonstrated in this research will be crucial to the design and integration of modern and next generation systems as it requires no mechanical housing, connectors, or assembly, resulting in a light weight, compact size, and low cost solution. Advisors/Committee Members: Sigmarsson, Hjalti (advisor), Yeary, Mark (committee member), Goodman, Nathan (committee member), Fulton, Caleb (committee member), Basara, Jeffrey (committee member).

Subjects/Keywords: Chebyshev; lowpass filter; suspended integrated stripline; suspended substrate stripline

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APA (6^th Edition):

McDaniel, J. (2018). Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/301298

Chicago Manual of Style (16^th Edition):

McDaniel, Jay. “Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/301298.

MLA Handbook (7^th Edition):

McDaniel, Jay. “Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems.” 2018. Web. 23 Jan 2021.

Vancouver:

McDaniel J. Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/301298.

Council of Science Editors:

McDaniel J. Self-Packaged and Low-Loss Suspended Integrated Stripline Filters for Next Generation Systems. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/301298

University of Oklahoma

7. Dower, William. Advances in Synthetic Aperture Radar from a Wavenumber Perspective.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52722

► This dissertation examines the wavenumber domain of Synthetic Aperture Radar (SAR) images. This domain is the inverse Fourier transform domain of a SAR image. The… (more)

Subjects/Keywords: synthetic aperture radar; image resolution; back projection; bistatic radar

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APA (6^th Edition):

Dower, W. (2017). Advances in Synthetic Aperture Radar from a Wavenumber Perspective. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52722

Chicago Manual of Style (16^th Edition):

Dower, William. “Advances in Synthetic Aperture Radar from a Wavenumber Perspective.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/52722.

MLA Handbook (7^th Edition):

Dower, William. “Advances in Synthetic Aperture Radar from a Wavenumber Perspective.” 2017. Web. 23 Jan 2021.

Vancouver:

Dower W. Advances in Synthetic Aperture Radar from a Wavenumber Perspective. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/52722.

Council of Science Editors:

Dower W. Advances in Synthetic Aperture Radar from a Wavenumber Perspective. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52722

University of Oklahoma

8. Thompson, Daniel. Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52942

► Elemental digital beamforming offers increased flexibility for multi-function radio frequency (RF) systems supporting radar and communications applications. As fully digital arrays, components, and subsystems are… (more)

▼ Elemental digital beamforming offers increased flexibility for multi-function radio frequency (RF) systems supporting radar and communications applications. As fully digital arrays, components, and subsystems are becoming more affordable in the military and commercial industries, analog components such as phase shifters, filters, and mixers have begun to be replaced by digital circuits which presents efficiency challenges in power constrained scenarios. Furthermore, multi-function radar and communications systems are exploiting the multiple simultaneous beam capability provided by digital at every element beamforming. Along with further increasing data samples rates and increasing instantaneous bandwidths (IBW), real time processing in the digital domain has become a challenge due to the amount of data produced and processed in current systems. These arrays generate hundreds of gigabits per second of data throughput or more which is costly to send off-chip to an adjunct processor fundamentally limiting the overall performance of an RF array system. In this dissertation, digital filtering techniques and architectures are described which calibrate and beamform both narrowband and wideband RF arrays on receive. The techniques are shown to optimize one or many parameters of the digital transceiver system to improve the overall system efficiency. Digitally beamforming in the beamspace is shown to further increase the processing efficiency of an adaptive system compared to state of the art frequency domain approaches by minimizing major processing bottlenecks of generating adaptive filter coefficients. The techniques discussed are compared and contrasted across different hardware processor modules including field-programmable gate arrays (FPGAs), graphical processing units (GPUs), and central processing units (CPUs). Advisors/Committee Members: Yeary, Mark (advisor), Fulton, Caleb (committee member), Goodman, Nathan (committee member), Bredeson, Jon (committee member), Antonio, John (committee member).

Subjects/Keywords: Real-Time; Elemental; Digital; Beamforming

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APA (6^th Edition):

Thompson, D. (2017). Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52942

Chicago Manual of Style (16^th Edition):

Thompson, Daniel. “Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/52942.

MLA Handbook (7^th Edition):

Thompson, Daniel. “Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays.” 2017. Web. 23 Jan 2021.

Vancouver:

Thompson D. Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/52942.

Council of Science Editors:

Thompson D. Real-Time Narrowband and Wideband Beamforming Techniques for Fully-Digital RF Arrays. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52942

University of Oklahoma

9. Lievsay, James. Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/51872

► Moving target detection with a passive radar system relies on many competing and coupled variables. When simulating a passive bistatic radar (PBR) system for ground… (more)

▼ Moving target detection with a passive radar system relies on many competing and coupled variables. When simulating a passive bistatic radar (PBR) system for ground moving target indication (GMTI) a three-dimensional model is critical. The signal path geometry induced from separating the radar receiver and transmitter causes several performance effects that change with location. Since a performance prediction is only as good as the model, the choice of how to model clutter becomes important. Measured data of bistatic clutter shows that the received clutter power depends on scattering angles. Therefore, a new in-plane out-of-plane (IPOP) interpolation model was developed. The IPOP model causes high clutter returns to reside in regions near an in-plane orientation (forward or backward scattering). The model produces a more localized clutter spectrum in angle-Doppler space when compared to monostatic radar. Generally, the stationary transmitter is modeled as a communication emitter due to the availability. These continuous waveforms must be partitioned as pulses spaced at constant intervals over the coherent processing interval (CPI). This diverse pulse train is non-ideal for pulse-Doppler radars. The waveform produces high range sidelobes and causes colored noise to spread in Doppler. It is shown for the first time that these waveform effects can be modeled through a covariance matrix taper (CMT). Choosing an optimal emitter becomes an interesting problem when multiple emitters are present. A common metric for GMTI when using space-time adaptive processing (STAP) is signal-to-interference-plus-noise ratio (SINR). However, SINR changes based off relative geometries, and GMTI depends on where a target's location and two-dimensional velocity maps into angle-Doppler space. Therefore, average SINR, weighted average SINR, minimum SINR, and usable velocity space fraction (UVSF) are the newly developed metrics proposed for down-selecting to an optimal emitter. The choice of metric is extremely dependent on the scenario. Finally, in STAP large clutter discretes (LCDs) can cause either false alarms or missed detections. Ultimately, they contaminate the data, and it is very desirable, yet very hard, to remove LCDs. However, the clutter structure in angle-Doppler space for PBR can offer a benefit for removing an LCD. Due to the fact that bistatic clutter can be more localized in angle-Doppler, the detection and estimation of an LCD can be accomplished for an out-of-plane geometry. Then the LCD can be successfully removed from the data, and new application of spectral estimation techniques have been developed for this purpose. Advisors/Committee Members: Goodman, Nathan (advisor), Fulton, Caleb (committee member), Jackson, Julie (committee member), Palmer, Robert (committee member), Yeary, Mark (committee member).

Subjects/Keywords: Radar Signal Processing; Space-Time Adaptive Processing; Passive Bistatic Radar

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APA (6^th Edition):

Lievsay, J. (2017). Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/51872

Chicago Manual of Style (16^th Edition):

Lievsay, James. “Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/51872.

MLA Handbook (7^th Edition):

Lievsay, James. “Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication.” 2017. Web. 23 Jan 2021.

Vancouver:

Lievsay J. Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/51872.

Council of Science Editors:

Lievsay J. Passive Radar Clutter Modeling and Emitter Selection for Ground Moving Target Indication. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/51872

University of Oklahoma

10. Zhu, Ye. Radar cross section modeling of tornadic debris and applications.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34599

► Tornadic debris plays an important role in the study of tornadoes due to the dramatic threat it poses to human life, and the devastation it… (more)

▼ Tornadic debris plays an important role in the study of tornadoes due to the dramatic threat it poses to human life, and the devastation it causes to commercial and residential property. Radar cross section (RCS) modeling on plate-like and cylindrical objects is developed in this tornadic debris study. The sheets, plates, and cylinders used in this study are designed to represent leaves, wood board, flat building forms, metal rods, tree trunks, and branches, respectively. Different techniques are evaluated in terms of the geometry of the object, accuracy, and math complexity and computation efficiency. Geometrical Optics (GO), Geometrical Theory of Diffraction (GTD), Finite Element Method (FEM), Finite Difference Time Domain method (FDTD), Moment of Method (MoM) and Physical Optics (PO) are introduced. Finally, the decision to use PO for deriving the formulation for plate-like objects throughout the dissertation was made. Non-metal objects such as cylinder broadside, endcap, general circular sheets and plates, surface impedance circular plates, rectangular sheets and plates, as well as metal circular plates are derived by hand. Metal objects such as cylinder broadside and rectangular plates, as well as resistive rectangular thin sheet approximations, are verified and cited from published research books and papers. Full wave simulation Ansys HFSS validates the analytical results in most cases. FEKO commercial software is used to compare the analytical results for two layer plates with different media and leaf sample applications. After testing, metal vs. non-metal plates and thin vs. thick plates are distinguished by 5 dB, 10 dB, and 20 dB from the simulation results, respectively; this fact confirms the accuracy and limitations of theory. By adding endcaps, one is able to compensate the deficiency from normal to the cap surface of the finite cylinder by at least several wavelengths in length and at least half of a wavelength in radius. The theoretical analysis of the extension of PO indicates that more accurate results appear as the incident angle gets closer to normal. The errors and limitations of PO are described and demonstrated by comparison plots of analytical results vs. HFSS throughout. The leaf library and wood board (dry and wet) studies are performed as sample applications for “real” debris types under the radar coordinate transformation system for all polarizations at oblique TEM incident wave. Research questions are answered in the conclusions. Advisors/Committee Members: Cruz, J.R (advisor), Palmer, Robert (committee member), Yang, Zhibo (committee member), Fulton, Caleb (committee member), Yeary, Mark (committee member).

Subjects/Keywords: radar cross section modeling, debris scatterer, plate-like and cylindrical objects, HFSS, FEKO, modeling applications; Physical Optics technique

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APA (6^th Edition):

Zhu, Y. (2016). Radar cross section modeling of tornadic debris and applications. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34599

Chicago Manual of Style (16^th Edition):

Zhu, Ye. “Radar cross section modeling of tornadic debris and applications.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/34599.

MLA Handbook (7^th Edition):

Zhu, Ye. “Radar cross section modeling of tornadic debris and applications.” 2016. Web. 23 Jan 2021.

Vancouver:

Zhu Y. Radar cross section modeling of tornadic debris and applications. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/34599.

Council of Science Editors:

Zhu Y. Radar cross section modeling of tornadic debris and applications. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34599

University of Oklahoma

11. 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 January 23, 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. 23 Jan 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 Jan 23]. 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

12. Saeedi, Shahrokh. Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/23305

► Multi-band/multi-mode wireless communication systems have been receiving increased attention recently due to their potential for spectrum management in a dynamic spectral environment. Similarly radar systems,… (more)

▼ Multi-band/multi-mode wireless communication systems have been receiving increased attention recently due to their potential for spectrum management in a dynamic spectral environment. Similarly radar systems, which can operate in a variety of frequency bands, could provide significant flexibility in the operation for the future applications. However, multi-band/multi-mode operation adds to the complexity of the microwave systems. Reconfigurable RF/microwave components in general, and tunable filters in particular, have been shown to be promising in significantly reducing the system complexity. On the other hand, current trend of development in wireless communication and radar systems, forces more stringent requirements for electromagnetic spectrum sharing. Therefore, in many microwave applications a very high level of isolation between the channels are required. This is including simultaneous transmit-receive systems or co-site interference scenarios where the leakage from high power transmitter into receiver degrades the system performance. In these applications, conventional tunable bandpass/bandstop filters cannot provide enough isolation between transmitter and receiver. A promising solution which provides a tunable null, independent of the tunable transmission passband, is a dynamic-tunable bandpass-bandstop filter cascade. In this research, a frequency-agile bandpass-bandstop filter cascade for radar systems with simultaneous transmission and reception is designed to create advanced filtering functionality to isolate the desired signals from interfering signals in a spectrally-crowded environment. For a radar with simultaneous transmit and receive, two filter cascade will be required. Each filter will be used on a separate frequency agile transceiver but they will be synchronized to provide simultaneously a deep isolation region at one frequency for receive and a high power tolerant passband at an adjacent frequency for transmit. Advisors/Committee Members: Sigmarssion, Hjalti (advisor), Yeary, Mark (committee member), Hong, Yang (committee member), Ruyle, Jessica (committee member), Fulton, Caleb (committee member).

Subjects/Keywords: Microwave; Filter; Bandpass-Bandstop Cascade; Simultaneous Transmit and Receive

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APA (6^th Edition):

Saeedi, S. (2015). Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/23305

Chicago Manual of Style (16^th Edition):

Saeedi, Shahrokh. “Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/23305.

MLA Handbook (7^th Edition):

Saeedi, Shahrokh. “Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception.” 2015. Web. 23 Jan 2021.

Vancouver:

Saeedi S. Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/23305.

Council of Science Editors:

Saeedi S. Frequency-Agile Microwave Filters For Radars With Simultaneous Transmission and Reception. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/23305

University of Oklahoma

13. 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 (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 January 23, 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. 23 Jan 2021.

Vancouver:

May RM. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Jan 23]. 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

University of Oklahoma

14. Bodine, David. Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/10424

► Tornadic debris are critical aspects of tornado studies because airborne debris pose significant threats to life and property, and debris often dominate backscattered radar signals,… (more)

▼ Tornadic debris are critical aspects of tornado studies because airborne debris pose significant threats to life and property, and debris often dominate backscattered radar signals, causing biased Doppler velocity measurements. Polarimetric radar offers new research opportunities because debris produce a unique polarimetric radar signature called the tornadic debris signature (TDS). In this study, new applications of TDSs are examined using Transmission (T) matrix calculations, polarimetric radar observations, and numerical simulations. To illuminate electromagnetic scattering characteristics of different debris types, T-matrix calculations are presented. While most TDS studies have focused on tornado detection, this study conducts a detailed analysis of 14 TDS cases to determine relationships between TDS parameters and EF-rating. As tornado EF-rating increases, 90th percentile radar reflectivity factor, TDS height, and TDS volume increase, and 10th percentile co-polar cross-correlation coefficient and differential reflectivity decrease. While the TDS parameter analysis focuses on a single radar frequency, debris scattering characteristics vary depending on radar frequency, and thus multiple frequency polarimetric radar observations may provide new information about debris. In a statistical analysis of dual-wavelength TDSs, higher radar reflectivity factor and lower co-polar cross-correlation coefficient are observed at S band compared to C band, and negative differential reflectivity is sometimes observed simultaneously at both frequencies. Multiple frequency radar observations have additional utility in determining debris concentrations to assess debris loading impacts. To simulate polarimetric radar signatures, tornado vortices are simulated in a Large-Eddy Simulation (LES) model with a drag force coupling parameterization based on debris trajectories, enabling momentum exchange between air and debris. As debris loading increases, simulations reveal decreasing near-surface radial, tangential and vertical velocities in the lowest grid cell. Further increases in debris loading cause greater reductions in near-surface velocities and reduced tornado core tangential and vertical velocities. Using T-matrix calculations and LES model runs, equivalent radar reflectivity factor and two-way attenuation rates are calculated to determine if equivalent radar reflectivity factor or attenuation provide useful upper-bounds on debris loading. These simulations reveal that if sufficient amounts of debris loading are present to affect tornado dynamics, significant attenuation will occur at W band, in many cases fully attenuating the transmitted radar signal. Advisors/Committee Members: Palmer, Robert (advisor), Biggerstaff, Michael (committee member), Bluestein, Howard (committee member), Heinselman, Pamela (committee member), Yeary, Mark (committee member).

Subjects/Keywords: Atmospheric Sciences.

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APA (6^th Edition):

Bodine, D. (2014). Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/10424

Chicago Manual of Style (16^th Edition):

Bodine, David. “Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/10424.

MLA Handbook (7^th Edition):

Bodine, David. “Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris.” 2014. Web. 23 Jan 2021.

Vancouver:

Bodine D. Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/10424.

Council of Science Editors:

Bodine D. Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/10424

University of Oklahoma

15. McCann, Florence. Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students.

Degree: PhD, 2013, University of Oklahoma

URL: http://hdl.handle.net/11244/7691

► Over a decade since Finson’s 2002 review article, “Drawing a Scientist: What We Do and Do Not Know After Fifty Years of Drawings”, images of… (more)

▼ Over a decade since Finson’s 2002 review article, “Drawing a Scientist: What We Do and Do Not Know After Fifty Years of Drawings”, images of scientists, sometimes stereotypes, continue to be created and promoted in popular media. The scholarly literature amply documents how education stakeholders ranging from elementary school age children to in-service teachers throughout the world perceive scientists. The impact of these images on students’ coursework and career choices is likewise well established. Strikingly, there are few studies where scientists reveal their self-perceptions. The most recent of these were published in 1975. The less well developed literature on engineer images reflects how they are stereotyped as “geeks” and “nerds”. No prior work on engineers’ self-perceptions has been identified. The engineering profession has explicitly recognized the importance of improving the image of engineering (Engineers Dedicated to a Better Tomorrow, 2006). Two research projects were initiated, a first to learn about the lived experiences of scientists, defined as faculty members in a natural science discipline at a research university holding a PhD and a second to learn about the lived experiences of engineers, defined as faculty members in a college of engineering at a research university, likewise holding a Ph.D. A naturalistic or constructivist research paradigm provided the theory base that guided the phenomenology research approach. No scientists agreed to join the scientist study. Engineer participants were asked to share their lived experiences as engineers in semi-structured in-person interviews. The interview data were analyzed according to a phenomenological reduction methodology (Moustakas, 1994). All identified protecting and serving society as an essential element of their experiences as engineers. Other themes that played significant roles in their experiences included their perceptions of the public; the public’s perception of engineers; stereotypes; gender; solitary work and team work; hard work/rigor; designing and building; solving problems; and creativity. While the engineers shared themes, they were not a monolithic group. Each had a unique underlying philosophy that governed how these themes were manifested. The engineers’ self-perceptions are valuable for designing interventions to foster accurate images of engineers for K-12 students. Curricula can be prepared that allow students to experience these essential aspects of being an engineer. The engineers’ Draw-An-Engineer Test (DAET) drawings can be used as benchmarks against which students’ drawings can be compared to assess the extent to which students’ perceptions of engineers and their work is aligned with that of these engineers’ self-perceptions. The themes described above guided the development of a curriculum for a STEM Club. The STEM Club was for identified gifted fifth grade girls. A female scientist/engineer led the club. The girls’ perceptions were accessed using the Draw-A-Scientist-Checklist (DAST-C)… Advisors/Committee Members: Marek, Edmund (advisor), Chiodo, John (committee member), Houser, Neil (committee member), Pasque, Penny (committee member), Yeary, Mark (committee member).

Subjects/Keywords: Science Education

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APA (6^th Edition):

McCann, F. (2013). Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/7691

Chicago Manual of Style (16^th Edition):

McCann, Florence. “Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students.” 2013. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/7691.

MLA Handbook (7^th Edition):

McCann, Florence. “Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students.” 2013. Web. 23 Jan 2021.

Vancouver:

McCann F. Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students. [Internet] [Doctoral dissertation]. University of Oklahoma; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/7691.

Council of Science Editors:

McCann F. Engineers' Self-Perceptions And A Strategy For Fostering Authentic Images of Engineers And Scientists Among Elementary School Students. [Doctoral Dissertation]. University of Oklahoma; 2013. Available from: http://hdl.handle.net/11244/7691

University of Oklahoma

16. Gately, Matthew Brandon. Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms.

Degree: PhD, 2012, University of Oklahoma

URL: http://hdl.handle.net/11244/318631

Finally, we conclude the work by offering recommendations for possible future work in the development of efficient MRCM algorithms and novel problem formulations for optimizing MCM circuits. Advisors/Committee Members: Yeary, Mark B (advisor).

Subjects/Keywords: Algorithms; Transformations (Mathematics); Mathematical optimization

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APA (6^th Edition):

Gately, M. B. (2012). Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318631

Chicago Manual of Style (16^th Edition):

Gately, Matthew Brandon. “Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms.” 2012. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/318631.

MLA Handbook (7^th Edition):

Gately, Matthew Brandon. “Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms.” 2012. Web. 23 Jan 2021.

Vancouver:

Gately MB. Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms. [Internet] [Doctoral dissertation]. University of Oklahoma; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/318631.

Council of Science Editors:

Gately MB. Multiple Real-Constant Multiplication for Computationally Efficient Implementation of Digital Transforms. [Doctoral Dissertation]. University of Oklahoma; 2012. Available from: http://hdl.handle.net/11244/318631

University of Oklahoma

17. Huck, Robert Charles. A Building Block Apporach to Port Security.

Degree: PhD, 2011, University of Oklahoma

URL: http://hdl.handle.net/11244/319129

► To accomplish this, a fully distributed building block approach to port security is demonstrated. Based on prior work accomplished in the design and fielding of… (more)

Subjects/Keywords: Ports of entry – Security measures; Intelligent transportation systems

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APA (6^th Edition):

Huck, R. C. (2011). A Building Block Apporach to Port Security. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319129

Chicago Manual of Style (16^th Edition):

Huck, Robert Charles. “A Building Block Apporach to Port Security.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/319129.

MLA Handbook (7^th Edition):

Huck, Robert Charles. “A Building Block Apporach to Port Security.” 2011. Web. 23 Jan 2021.

Vancouver:

Huck RC. A Building Block Apporach to Port Security. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/319129.

Council of Science Editors:

Huck RC. A Building Block Apporach to Port Security. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/319129

University of Oklahoma

18. Zhai, Yan. Improved nonlinear filtering for target tracking.

Degree: PhD, School of Electrical and Computer Engineering, 2007, University of Oklahoma

URL: http://hdl.handle.net/11244/1164

► The objective of this research is to develop robust and accurate tracking algorithms for various tracking applications. These tracking problems can be formulated as nonlinear… (more)

Subjects/Keywords: Tracking radar.; State-space methods.; Engineering, Electronics and Electrical.; Monte Carlo method.

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

APA (6^th Edition):

Zhai, Y. (2007). Improved nonlinear filtering for target tracking. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/1164

Chicago Manual of Style (16^th Edition):

Zhai, Yan. “Improved nonlinear filtering for target tracking.” 2007. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/1164.

MLA Handbook (7^th Edition):

Zhai, Yan. “Improved nonlinear filtering for target tracking.” 2007. Web. 23 Jan 2021.

Vancouver:

Zhai Y. Improved nonlinear filtering for target tracking. [Internet] [Doctoral dissertation]. University of Oklahoma; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/1164.

Council of Science Editors:

Zhai Y. Improved nonlinear filtering for target tracking. [Doctoral Dissertation]. University of Oklahoma; 2007. Available from: http://hdl.handle.net/11244/1164

Open Access Theses and Dissertations