A Geometry-Based Doppler Centroid Estimator for Bistatic Forward-Looking SAR

被引：27

作者：

Li, Wenchao ^{[1
]}

Yang, Jianyu ^{[1
]}

Huang, Yulin ^{[1
]}

Wu, Junjie ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Elect Engn, Chengdu 611731, Peoples R China

来源：

IEEE GEOSCIENCE AND REMOTE SENSING LETTERS | 2012年 / 9卷 / 03期

关键词：

Bistatic SAR; Doppler centroid estimation; forward looking; minimum entropy; synthetic aperture radar (SAR); AMBIGUITY;

D O I：

10.1109/LGRS.2011.2170151

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：

For high-quality synthetic aperture radar (SAR) processing, Doppler centroid estimation is an essential procedure. An incorrect Doppler centroid would cause a loss of signal-to-noise ratio, an increase in the azimuth ambiguity level, and a shift in the location of the target. Based on the analysis of the range migration characteristic of the transmitter-fixed bistatic forward-looking SAR, a geometry-based Doppler centroid estimator is proposed in this letter. By searching for the range walk slope based on the minimum entropy, this method estimates the unambiguous Doppler centroid directly. Simulations validate the effectiveness of this method.

引用

页码：388 / 392

页数：5

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