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FMCW-SAR System For Near Distance Imaging Applications Open Access


Other title
Type of item
Degree grantor
University of Alberta
Author or creator
Ting, Jui wen
Supervisor and department
Karumudi, Rambabu (Electrical and Computer Engineering)
Examining committee member and department
Jing, Yindi (Electrical and Computer Engineering)
Moez, Kambiz (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Electromagnetics and Microwaves
Date accepted
Graduation date
2017-06:Spring 2017
Master of Science
Degree level
A combination of frequency-modulated continuous-wave (FMCW) technology with synthetic aperture radar (SAR) principles is a highly sought after method as it leads to a compact and cost effective high resolution near distance imaging system. However, there are a few design issues associated with FMCW radar systems that need to be addressed in order to design an optimal FMCW SAR imaging system. One of the limiting factors of FMCW radars is that the ramp signal modulates the received signal, which limits the minimum achievable range resolution. In addition, the voltage controlled oscillator (VCO) adds a certain degree of phase noise and nonlinearity to the transmitted signal that degrades the signal-to-noise ratio (SNR), range accuracy and image resolution. To resolve these issues, a multitude of hardware and software approaches have been proposed for the suppression of phase noise and nonlinearity of the transmitted signal. However, these approaches resolve only individual issues, limiting their applicability in the design of FMCW SAR imaging systems. This work seeks to overcome the three design issues mentioned above through the development of simulation platforms, which has been shown to be well-suited for the comprehensive study of these effects. A signal processing procedure with system calibration methods to mitigate the effects of deramp, phase noise and nonlinearity of the VCO on the beat spectrum is proposed. Additionally, the effect of bandwidth, integration angle and phase noise of the received pulses on the SAR image resolution in both range and cross-range directions are comprehensively studied. To improve the range accuracy, different calibration methods are also comprehensively studied. To demonstrate the effectiveness and versatility of the proposed signal processing procedure, an S-band FMCW radar system, using off-the-shelf components, is designed for near distance target imaging using linear and circular SAR techniques. The reconstructed images show the improvement of image quality and accuracy in the target position. Finally, several avenues of further study and applications are suggested.
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