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

Author

Li, Wenchao ; Yang, Jianyu ; Huang, Yulin ; Wu, Junjie

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

9

Issue

3

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

388

Lastpage

392

Abstract

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.

Keywords

Doppler radar; geophysical techniques; minimum entropy methods; synthetic aperture radar; azimuth ambiguity level; geometry-based Doppler centroid estimator; high-quality synthetic aperture radar; incorrect Doppler centroid; minimum entropy estimation method; range migration characteristics; signal-to-noise ratio; transmitter-fixed bistatic forward-looking SAR; Azimuth; Doppler effect; Estimation; Receivers; Remote sensing; Synthetic aperture radar; Transforms; Bistatic SAR; Doppler centroid estimation; forward looking; minimum entropy; synthetic aperture radar (SAR);

fLanguage

English

Journal_Title

Geoscience and Remote Sensing Letters, IEEE

Publisher

ieee

ISSN

1545-598X

Type

jour

DOI

10.1109/LGRS.2011.2170151

Filename

6069533