Open AccessWavefront curvature compensation in PFA for spotlight bistatic SAR with arbitrary platforms paths
Author(s) -
Miao Yuxuan,
Chen Tianfu,
Wu Junjie,
Yang Jianyu
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0413
Subject(s) - wavefront , distortion (music) , synthetic aperture radar , azimuth , curvature , computer science , compensation (psychology) , bistatic radar , domain (mathematical analysis) , radar imaging , algorithm , radar , optics , computer vision , mathematics , physics , geometry , telecommunications , mathematical analysis , psychology , amplifier , bandwidth (computing) , psychoanalysis
Polar format algorithm (PFA) as is an efficient algorithm can be well applied to spotlight bistatic synthetic aperture radar (SAR). However, a planar wavefront assumption which leads to image distortion is made. In this study, a new method to compensate for the wavefront curvature of PFA image is presented and it can well correct the defocusing effect and geometry distortion even under arbitrary platforms paths. By projecting the coefficients of Taylor expansion from the azimuth‐time domain to wavenumber domain, the new method does not need repeated interpolations to construct the compensation filters for all the errors, which can decrease computational expense in a way. Finally, the effectiveness of this method is verified by numerical simulation.