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The correction of chirp radar signals based on SAR raw data |
Huang Lisheng①; Wang Zhensong①; Xu Yongjian② |
①Institute of Computer Technology Chinese Academy of Sciences Beijing 100080 China;②Institute of Electronics Chinese Academy of Sciences Beijing 100080 China |
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Abstract This paper introduces an algorithm used in estimation of the phase error of chirp signal. Firstly, the algorithm applies Range Cell Migration Correction (MCRC) to SAR signals with chirp scaling method, and processes on azimuth compression only. Then the phase error of the radar chirp signal is estimated by applying the auto-focus method, for example, Map Drift (MD) or Phase Gradient Algorithm (PGA) to the azimuth processing of signals. Further correction on estimated phase error is applied to discussion of the factors that influent the phase error estimation. The algorithm is proved by computer simulation.
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Received: 13 April 2001
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