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Sensors 2008, 8(5), 3438-3446; doi:10.3390/s8053438

Article

A Two Dimensional Overlapped Subaperture Polar Format Algorithm Based on Stepped-chirp Signal

Xinhua Mao * , Daiyin Zhu, Xin Nie and Zhaoda Zhu

Department of Electronic Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

* Author to whom correspondence should be addressed.

Received: 3 April 2008; Accepted: 19 May 2008 / Published: 26 May 2008

(This article belongs to the Special Issue Synthetic Aperture Radar (SAR))

Download PDF Full-Text [105 KB, uploaded 16 September 2008 11:02 CEST]

Abstract: In this work, a 2-D subaperture polar format algorithm (PFA) based on steppedchirp signal is proposed. Instead of traditional pulse synthesis preprocessing, the presented method integrates the pulse synthesis process into the range subaperture processing. Meanwhile, due to the multi-resolution property of subaperture processing, this algorithm is able to compensate the space-variant phase error caused by the radar motion during the period of a pulse cluster. Point target simulation has validated the presented algorithm.

Keywords: Synthetic aperture radar (SAR); subaperture; synthetic bandwidth; steppedchirp signal; space-variant phase compensation

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