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Study of High Resolution Spotlight Synthetic Aperture Radar Imaging

Author: ZhangShiMing
Tutor: JiKeFeng
School: National University of Defense Science and Technology
Course: Electronics and Communication Engineering
Keywords: Radar Imaging Synthetic Aperture Radar Spotlight SAR Polar format algorithm Chirp-Z transform Range Migration Algorithm Spectral analysis of the convolution processing Wide Scene High resolution Doppler ambiguity
CLC: TN957.52
Type: Master's thesis
Year: 2010
Downloads: 124
Quote: 1
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Abstract


Resolution imaging for airborne synthetic aperture radar (Airborne SAR) is very important. Spotlight SAR use on sensitive areas to achieve long observation azimuth resolution greatly enhance its detection in the modern battlefield , target high-resolution feature extraction and recognition applications such as extremely important application value. Polar format algorithm works because of its simplicity and ease of implementation in practice is widely used. Polar format imaging algorithm implementation, usually Interpolation polar format to format conversion Cartesian coordinates . For polar format algorithm using Chirp-Z transform polar coordinates to rectangular coordinates format format conversion , can effectively avoid the traditional interpolation large amount of computation polar format algorithm greatly improve imaging efficiency. Based on the study polar format algorithm , based on the width of the scene also studied spotlight SAR imaging algorithm . The algorithm combines the spectral analysis convolution (SPECAN) operation to achieve the position of the Doppler go fuzzy , and then use the traditional polar format algorithm interpolation and migration processes from high-resolution imaging, imaging precision Scenes from the restrictions can be realized High-resolution large scene spotlight SAR imaging . This work focused on high-resolution spotlight SAR imaging algorithm , the main contents are as follows : a study of polar format algorithm algorithm principle and processes , and quantitatively derived polar format algorithm imaging scene limits ; 2 study achieved using the Chirp-Z polar format algorithm to improve polar format algorithm computing efficiency , combined with the measured data for Chirp-Z achieve polar format algorithm was verified ; 3 , presents a wide-area high-resolution spotlight SAR imaging algorithm . Consider high-resolution wide scenes spotlight SAR azimuth sampling frequency is greater than the instantaneous bandwidth situation , the introduction of SPECAN conducted in azimuth Doppler algorithm to obfuscate , to eliminate azimuth spectrum aliasing , and then by constructing quadratic phase compensation function and the use of appropriate interpolation support area complete recovery , and finally through IFFT achieve high precision dimensional confocal imaging .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Data,image processing and admission
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