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Sensors 2017, 17(5), 1058; doi:10.3390/s17051058

A Generalized Chirp-Scaling Algorithm for Geosynchronous Orbit SAR Staring Observations

School of Electronics and Information, Northwestern Polytechnical University, N 1, Dongxiang Rd, Xi’an 710129, China
China Academy of Space Technology (Xi’an), Weiqu Street, Xi’an 710100, China
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 19 March 2017 / Revised: 30 April 2017 / Accepted: 2 May 2017 / Published: 6 May 2017
(This article belongs to the Section Remote Sensors)
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Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) has recently received increasing attention due to its ability of performing staring observations of ground targets. However, GEO SAR staring observation has an ultra-long integration time that conventional frequency domain algorithms cannot handle because of the inaccurately assumed slant range model and existing azimuth aliasing. To overcome this problem, this paper proposes an improved chirp-scaling algorithm that uses a fifth-order slant range model where considering the impact of the “stop and go” assumption to overcome the inaccuracy of the conventional slant model and a two-step processing method to remove azimuth aliasing. Furthermore, the expression of two-dimensional spectrum is deduced based on a series of reversion methods, leading to an improved chirp-scaling algorithm including a high-order-phase coupling function compensation, range and azimuth compression. The important innovations of this algorithm are implementation of a fifth-order order slant range model and removal of azimuth aliasing for GEO SAR staring observations. A simulation of an L-band GEO SAR with 1800 s integration time is used to demonstrate the validity and accuracy of this algorithm. View Full-Text
Keywords: staring observation; geosynchronous SAR; fifth-order slant range mode; improved chirp-scaling algorithm staring observation; geosynchronous SAR; fifth-order slant range mode; improved chirp-scaling algorithm

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, C.; He, M. A Generalized Chirp-Scaling Algorithm for Geosynchronous Orbit SAR Staring Observations. Sensors 2017, 17, 1058.

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