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Now showing items 11-20 of 47
Robust Velocity Dealiasing for Weather Radar Based on Convolutional Neural Networks
(2023-05-12)
Doppler weather radar is an essential tool for monitoring and warning of hazardous weather phenomena. In weather radar, achieving a longer aliasing range (ra) is crucial for surveillance, and a higher aliasing velocity ...
Study of advanced resonant photonic gratings in the mid-infrared spectrum for the chemical sensing applications
(2023-08-04)
This dissertation focuses on developing advanced Mid-IR optical devices for chip-scale chemical sensing. Various Mid-IR techniques based on Beer-Lambert’s law offer valuable insights into molecular interactions but suffer ...
Object detection in dual-band infrared
(2023-12-15)
Dual-Band Infrared (DBIR) offers the advantage of combining Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) within a single field-of-view (FoV). This provides additional information for each spectral band. DBIR ...
Digital Beamforming Applications and Demonstrations of an RF System-on-a-Chip
(2021-08-05)
EM phased array system bandwidth is conventionally constrained by the use of phase shifters for beamsteering, which results in beam squint and pulse dispersion of wideband signals. Wideband antenna performance can be ...
Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar
(2020-12-18)
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 ...
Machine learning for classifying biological radar echoes with S-band polarimetric radar
(2023-12-15)
The S-band WSR-88D weather radar is sensitive enough to observe biological
scatterers like birds and insects. However, their non-spherical shapes and frequent
collocation in the radar resolution volume create challenges ...
Developing novel quantitative imaging analysis schemes based machine learning for cancer research
(2021-05-14)
The computer-aided detection (CAD) scheme is a developing technology in the medical imaging field, and it attracted extensive research interest in recent years. In this dissertation, I investigated the feasibility of ...
Using correlated imaging and difference frequency generation to determine the group delay for an unknown ultra short optical pulse: An analytical and numerical simulation calculation
(2022-05-13)
A pulse laser emits ultrashort optical pulses with pulse widths on the order of pico-seconds and narrower. A full characterization of these optical pulses requires complete knowledge of their corresponding spectral amplitude ...
Design, fabrication, and development of GeTe phase-change switches for reconfigurable RF applications
(2023-08-04)
This research is devoted to studying the chalcogenide phase change material (PCM) properties and their potential capability in RF switching applications. The goal of RF switches would be to realize the reconfigurability ...
Ultra-miniaturized and high-Q embedded loaded coaxial cavity resonators and filters
(2023-05-12)
The rapid development in modern wireless communication systems and remote sensing and their applications towards portable and compact systems are inevitable. Microwave filters are critical components in the RF front-ends ...