Nonuniform sampling PFA for squint spotlight SAR imaging

Author

Xu, Huaping ; Deming Quo ; Li, Jingwen

Author_Institution

Sch. of Electron. & Inf. Eng., Beihang Univ., Beijing, China

fYear

2011

fDate

24-29 July 2011

Firstpage

332

Lastpage

335

Abstract

This paper improved polar format algorithm (PFA) based on nonuniform azimuth sampling for squint spotlight synthetic aperture radar (SAR) imaging. The range resampling for chirped signal is carried out by chirp z transform (CZT). The novel nonuniform azimuth sampling during the echo data collection enables the utilizing of CZT in azimuth resampling. According to the data collection geometry, the precise expression of phase error induced by wavefront curvature is deduced, and then the overlapped subaperture approach (OSA) is adopted to correct the geometric distortion and defocus arising from the effect of wavefront curvature. Simulation results confirm the validity of the presented approach.

Keywords

Z transforms; radar imaging; synthetic aperture radar; chirp z transform; chirped signal; echo data collection; geometric distortion; nonuniform azimuth sampling; nonuniform sampling PFA; overlapped subaperture approach; polar format algorithm; range resampling; squint spotlight SAR imaging; synthetic aperture radar imaging; wavefront curvature; Azimuth; Chirp; Image resolution; Imaging; Interpolation; Nonuniform sampling; Synthetic aperture radar; Synthetic aperture radar; chirp-z transform; overlapped subaperture; polar format algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International

Conference_Location

Vancouver, BC

ISSN

2153-6996

Print_ISBN

978-1-4577-1003-2

Type

conf

DOI

10.1109/IGARSS.2011.6048966

Filename

6048966