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Precision two-dimensional focusing of spaceborne synthetic aperture radar data with range-varying Doppler centroid

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4 Author(s)
Heng, A.W.-C. ; Dept. of Comput. Sci., Nat. Univ. of Singapore, Singapore ; Hock Lim ; Soo Chin Liew ; Tan, B.T.G.

An efficient two-dimensional synthetic aperture radar (SAR) processing algorithm based on the exact transfer function is presented. The approximations made are similar to those in the chirp-scaling algorithm but it works with range-compressed data and can easily handle systems with range-varying Doppler centroids. The range-dependent migration is treated as a small perturbation from that of a given range position. This small deviation is corrected by resampling whilst the main migration factor (large in cases of large Doppler centroids) is corrected by a two-dimensional phase multiply. The azimuth compression filter is range-dependent and implemented as in the range-Doppler algorithm. This algorithm can be easily incorporated into SAR processors using the classical range-Doppler algorithm. The authors tested the algorithm on the Seasat Goldstone scene, ERS-1 and RADARSAT data. The interferometric offset tests show that the algorithm is phase-preserving

Published in:

Geoscience and Remote Sensing, 1997. IGARSS '97. Remote Sensing - A Scientific Vision for Sustainable Development., 1997 IEEE International  (Volume:2 )

Date of Conference:

3-8 Aug 1997