Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/53311
Title: Precision two-dimensional focusing of spaceborne synthetic aperture radar data with range-varying Doppler centroid
Authors: Heng, Alice Wang-Cheng 
Lim, Hock 
Liew, Soo Chin 
Tan, Bernard T.G. 
Issue Date: 1997
Source: Heng, Alice Wang-Cheng,Lim, Hock,Liew, Soo Chin,Tan, Bernard T.G. (1997). Precision two-dimensional focusing of spaceborne synthetic aperture radar data with range-varying Doppler centroid. International Geoscience and Remote Sensing Symposium (IGARSS) 2 : 734-736. ScholarBank@NUS Repository.
Abstract: 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. We tested the algorithm on the Seasat Goldstone scene, ERS-1 and RADARSAT data. The interferometric offset tests show that the algorithm is phase-preserving.
Source Title: International Geoscience and Remote Sensing Symposium (IGARSS)
URI: http://scholarbank.nus.edu.sg/handle/10635/53311
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