A hybrid Synthetic Aperture Radar autofocus approach based on FRFT and PGA

Author

Bai Xia ; Wang Dalong ; Zhao Juan

Author_Institution

Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China

Volume

3

fYear

2012

fDate

21-25 Oct. 2012

Firstpage

1940

Lastpage

1943

Abstract

In order to obtain high-resolution images, autofocus are widely used in Synthetic Aperture Radar (SAR) imaging. In this paper, a hybrid SAR autofocus approach is proposed, which estimates the quadratic phase error by using the fractional Fourier transform (FRFT) and the residual phase error by the phase gradient autofocus (PGA). The proposed approach combines the parametric and non-parametric autofocus techniques and its performance is superior to that of the PGA alone. Experimental results of simulated and real data demonstrate the validity of this hybrid approach.

Keywords

Fourier transforms; gradient methods; image resolution; radar imaging; synthetic aperture radar; FRFT; PGA; SAR imaging; fractional Fourier transform; high-resolution images; hybrid SAR autofocus approach; hybrid synthetic aperture radar autofocus approach; nonparametric autofocus techniques; phase gradient autofocus; quadratic phase error; synthetic aperture radar imaging; autofocus; fractional Fourier transform (FRFT); phase gradient autofocus (PGA); synthetic aperture radar (SAR);

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing (ICSP), 2012 IEEE 11th International Conference on

Conference_Location

Beijing

ISSN

2164-5221

Print_ISBN

978-1-4673-2196-9

Type

conf

DOI

10.1109/ICoSP.2012.6491959

Filename

6491959