Modified Range-Doppler Algorithm for High Squint SAR Echo Processing

被引：25
作者：
Fan, Wenna [1 ]
Zhang, Min [1 ]
Li, Jinxing [1 ]
Wei, Pengbo [1 ]
机构：
[1] Xidian Univ, Sch Phys & Optoelect Engn, Xian 710071, Shaanxi, Peoples R China
来源：
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS | 2019年 / 16卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Fourth-order phase model; high squint synthetic aperture radar (SAR); modified range-Doppler algorithm (M-RDA);
D O I：
10.1109/LGRS.2018.2873680
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 modified range-Doppler algorithm (M-RDA) for processing high squint synthetic aperture radar (SAR) echoes is proposed in this letter. Unlike the original RDA, the M-RDA directly corrects the range cell migration in the range frequency domain without interpolation, which greatly enhances its computational efficiency. When analyzing a high squint SAR echo signal, the approximation of the distance between the SAR antenna and the scene of interest leads to error in azimuthal compression. To address this problem, a fourth-order phase model is considered in the proposed algorithm to achieve accurate azimuthal compression. Finally, geometry correction is performed to obtain the final focused SAR images. The simulation results show that the proposed algorithm can process high squint SAR echoes effectively.
引用
收藏
页码：422 / 426
页数：5
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