THE IMAGING PROCESSING FOR WIDE SWATH SPACEBORNE SPOTLIGHT SAR

摘要

In this paper, relationships of radar system parameters and swath width were studied. Then we presented that dechirp-on-receive approach is not suitable for wide swath spaceborne spotlight SAR system. By using a method presented in [1], the raw data can be numerically dechirped, with appropriate reference functions, after a Fourier transform in range coordinates. While pulse repetition frequency (PRF) of SAR system can reduced to azimuth bandwidth after numerical dechirp. After processing no dechirped spotlight SAR data with this approach, conventional image formation algoriths for spotlight SAR such as PFA can be used to process spaceborne spotlight SAR data after a few of modification.