Aimed at the realization of ultra-wide-swath, the operation of spaceborne multi-channels synthetic aperture radar(SAR) systems in ScanSAR mode was studied. Based on the characteristic analysis of the mode, a new method of ultra-wide-swath was presented as well as the imaging algorithm (MCECS, multiple channels extended chirp scaling). The algorithm calibrates amplitude and phase difference among receive-channels by internal calibration data and reconstructs nonuniformly sampled signal in azimuth by filter banks. After Scalloping remedy by applying the amendatory length of antenna and accurate focusing, it enabled the subswaths combination after image geocoding by solving the quartic equation. Finally, computer simulations show the validity of the algorithm.
Yang Wei, Li Chunsheng, Chen Jie, Wang Pengbo.Multiple channels extended chirp scaling algorithm for spaceborne multi-channels data processing in ScanSAR mode[J] JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(10): 1196-1201