Browsing The University of Oklahoma by Subject "Radar"
Now showing items 1-20 of 38
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Accelerating Distributed Synthetic Aperture Radar Data Simulations Via CUDA
(2022-05)A general simulation of distributed synthetic aperture radar (DSAR) data is useful to evaluate the theoretical performance of a DSAR system and its underlying algorithms without a deployed system in place. Simulating DSAR ... -
Analysis of the Finite Array on the Scanning Performance of Phased Array Antennas
(2020-12-18)Modern high performance phased array antennas require large apertures to achieve both high gain and narrow beamwidth. It is not practical to manufacture such large apertures, so the full array is composed of smaller ... -
An analysis of the information content of radar detection
(2022-08-04)The availability of the electromagnetic spectrum (EMS) was an unseen issue in the past, as there was sufficient spectrum access to suit the needs of its’ consumers. Today, the use of the EMS has been become integrated ... -
Application of Machine Learning to Multiple Radar Missions and Operations
(2022-08-04)This dissertation investigated the application of Machine Learning (ML) in multiple radar missions. With the increasing computational power and data availability, machine learning is becoming a convenient tool in developing ... -
CLUTTER DETECTION AND MITIGATION FOR DUAL-POLARIZATION WEATHER RADAR
(2019-12-13)Ground clutter in weather radar observations causes degradation of data quality and can lead to misinterpretation of radar echoes. It is important to detect clutter and mitigate its effects to obtain accurate weather ... -
Coupling-based wideband digital phased array calibration techniques
Recently, interest in phased array radars for diverse applications has been rising because of their versatility and recent efforts to reduce their cost. All phased array radars require some form of calibration to periodically ... -
Creeping Wave Propagation On Cylindrical Radiating Structures
(2019-08-01)Weather radar is a powerful tool for detecting hazardous weather that may impact the lives of many. Most weather radars used by meteorologists today rely on a mechanical sweep to obtain volumetric data. This mechanical ... -
Deep Learning for Weak Target Detection in Range-Doppler Data
(2022-05)A consistent issue for detectors in radar systems is how to correctly distinguish target signals from random noise. This is especially true for weak targets with low signal-to-noise ratios (SNRs). Traditional target detection ... -
DESIGN AND IMPLEMENTATION OF AN ALL-COTS DIGITAL BACK-END FOR A PULSE-DOPPLER SYNTHETIC APERTURE RADAR
(2020-05-08)Radar imaging techniques employing synthetic aperture radar (SAR) are ubiquitous in applications such as defense, remote sensing, space exploration, terrain mapping, and many others. However, to obtain fine image resolution, ... -
Digital predistortion of wideband radar waveforms
(2021-12-17)As demands for increased radio frequency system performance have grown over time, sufficiently mitigating the distortion introduced by high power amplifiers has proven to be a major challenge to overcome. Digital predistortion ... -
Doppler Radar Analyses of Tornadic Supercells on 19 May 2013
(2016-05-13)On 19 May 2013, two supercells moved through central Oklahoma and produced seven tornadoes, including one of EF-3 and one of EF-4 intensity. High temporal and spatial resolution observations were collected in both strong ... -
An Evaluation of Radar- and Satellite-Data Based Products to Discriminate Between Tornadic and Non-Tornadic Storms
(2017-12)Severe weather, and specifically tornadoes, can pose a significant threat to property and human life. Tornadic storms have been extensively studied using radar observations for decades, and some more recent studies have ... -
Exploring Tornado Debris Signature Hypotheses Using Radar Simulations and Large-Eddy Simulations
(2021)Tornadoes can loft various types and sizes of debris, sometimes resulting in a polarimetric radar signature called the TDS (Tornado Debris Signature). The presence of a TDS in the radar data can help confirm the occurrence ... -
A fuzzy logic algorithm for classifying bird and insect radar echoes at S-band
(2018-08-02)A fuzzy logic algorithm for the separation of bird echoes from insect echoes using Next Generation Radar (NEXRAD) and considering range effects has been developed. The radar used in this study is the S-band (10 cm wavelength) ... -
Improving Drop Size Distribution Retrieval and Rain Estimation from Polarimetric Radar Data using the Deep Neural Network
(2022-08)Drop size distribution (DSD) and rain rate (R) have been estimated from polarimetric radar data are now available nationwide. DSD and R are essential in understanding rain microphysics. Past studies utilized parametrized ... -
The Intersection of Radar and Communications: A Study on Spectrum Management for Addressing RF Interference
(2023-05-12)The radio frequency (RF) spectrum is a fruitful yet competitive frontier that enables technologies like 5G, Wi-Fi, Bluetooth, GPS, long-range telescopes, microwave ovens, radar, and more. With finite supply and increasing ... -
An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays
(2019-05-10)Fully digital arrays offer significant advantages in terms of flexibility and performance, however they suffer from dynamic range issues when used in the presence of in-band interferers. Higher dynamic range components may ... -
An Investigation Between Tornadic and Non-Tornadic QLCS Mesovortices using Operational and Experimental MRMS Products
(2023-08-04)Quasi-linear convective system (QLCS) tornadoes have become an active area of research over the last several years. Through numerical simulations, it is theorized that QLCS vortex formation occurs near the surface in a ... -
A Kinematic and Thermodynamic Analysis of the 17 May 2019 McCook / Farnam, Nebraska Tornadic Supercell
(2023-08-04)The Targeted Observation by Radars and UAS of Supercells field project successfully deployed on a cyclic tornadic supercell in southwest Nebraska on 17–18 May 2019. This case study uses data from the two airborne radars ... -
A LAGRANGIAN PERSPECTIVE OF MESOCYCLONES AND DOWNDRAFTS IN OBSERVED AND NUMERICALLY SIMULATED SUPERCELLS
(2018-05)On 29 May 2004, a high-precipitation supercell thunderstorm developed in western Oklahoma and produced tornadoes during almost every distinct mesocyclone cycle over a six-hour period. The storm was exceptional in its size, ...