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Algorithms for Spotlight Mode SAR Image Formation Based on Along-Track Alignment and Format System

Author: ZhangZuo
Tutor: ZhuZuoYin
School: Nanjing University of Aeronautics and Astronautics
Course: Signal and Information Processing
Keywords: Synthetic Aperture Radar Spotlight Mode Signal format Polar format algorithm Range migration algorithm Distance bending Azimuth scale transformation
CLC: TN957.5
Type: Master's thesis
Year: 2006
Downloads: 186
Quote: 2
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Abstract


Synthetic aperture radar (Synthetic Aperture Radar, SAR) Spotlight Mode is a high-resolution imaging mode, but with the increase in the length of the synthetic aperture and resolution enhancement, the goal of the more distinguished unit move around (Migration Through Range Cell, MTRC) also with the intensified, resulting in image distortion, defocus, and limits the size of the area of ??high resolution imaging. Signal format is the key to high-resolution imaging of large scenes. Spotlight Mode classic algorithm polar coordinate format algorithm (Polar Format Algorithm, PFA) to discuss, from the angle of signal format PFA distance bending limit on the size of the area of ??high-resolution imaging, and given compensation distance curved complex, but makes compensation from the bending of empty degeneration and a large amount of computation. Range migration algorithm (Range Migration Algorithm, RMA) is another widely used bunching mode imaging algorithm. From the signal format, RMA can be ideal signal format fully compensate MTRC big scene with high resolution imaging capability. However, RMA processing signals azimuth contains azimuth linear FM radar system along-track has a high sampling rate, reduce the efficiency of the algorithm calculation. This article focuses on the big scene polar format algorithm (Widefield the Polar the Format Algorithm, WPFA) Stolt polar coordinates algorithm (Stolt Polar Algorithm, SPA), Differential Doppler algorithm (Differential Doppler Algorithm, DDA) and radar survey processing algorithms (Radar Survey Processor Algorithm, RSP) is a new imaging algorithm azimuth scale transformation (Along-Track Alignment and Format System, ATAFS) combined with the traditional signal processing methods. ATAFS signal phase history storage format empty variable correction to avoid bending distance method, which make a large, high-resolution scene imaging is possible. WPFA, SPA and DDA fully compensate for the MTRC, the signal format is ideal, with high resolution imaging capability of the big scenes. RSP can be applied to real-time image processing. Compared with RMA-based a big scene imaging ATAFS algorithm to calculate the efficiency with greatly improved this paper, the implementation method the ATAFS improve computational efficiency to: Fix ATAFS reference to the function of these four algorithms applied to handle of two dimensional Dechirp demodulation movement The compensation-to-center signal, as well as reduce the azimuth sampling rate to reduce the amount of signal data to extract the signal azimuth. Finally, the the big scene based ATAFS imaging algorithm in the processing of the measured data.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment
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