PRECISION SAR PROCESSING USING CHIRP SCALING

被引:729
作者
RANEY, RK
RUNGE, H
BAMLER, R
CUMMING, IG
WONG, FH
机构
[1] CANADA CTR REMOTE SENSING,OTTAWA K1A 0Y7,ON,CANADA
[2] GERMAN AEROSP RES ESTAB DLR,OBERPFAFFENHOFER,GERMANY
[3] UNIV BRITISH COLUMBIA,DEPT ELECT ENGN,VANCOUVER V6T 1Z4,BC,CANADA
[4] MACDONALD DETTWILER,RICHMOND V6V 2JW,BC,CANADA
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1994年 / 32卷 / 04期
关键词
D O I
10.1109/36.298008
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A space-variant interpolation is required to compensate for the migration of signal energy through range resolution cells when processing synthetic aperture radar (SAR) data, using either the classical range/Doppler (R/D) algorithm or related frequency domain techniques. In general, interpolation requires significant computation time, and leads to loss of image quality, especially in the complex image. The new chirp scaling algorithm avoids interpolation, yet performs range cell migration correction accurately. The algorithm requires only complex multiplies and Fourier transforms to implement, is inherently phase preserving, and is suitable for wide-swath, large-beamwidth, and large-squint applications. This paper describes the chirp scaling algorithm, summarizes simulation results, presents imagery processed with the algorithm, and reviews quantitative measures of its performance. Based on quantitative comparison, the chirp scaling algorithm provides image quality equal to or better than the precision range/Doppler processor. Over the range of parameters tested, image quality results approach the theoretical limit, as defined by the system bandwidth.
引用
收藏
页码:786 / 799
页数:14
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