volume | PIER Journals

2011-07-25

An Improved Polar Format Algorithm with Performance Analysis for Geosynchronous Circular SAR 2D Imaging

Qi Liu,

Dr. Qi Liu

Institute of Electronics, Chinese Academy of Sciences

China

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Wen Hong,

Dr. Wen Hong

National Key Laboratory of Microwave Imaging Technology

China

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Weixian Tan,

Prof. Weixian Tan

College of Information Engineering

Inner Mongolia University of Technology

China

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Yun Lin,

Dr. Yun Lin

National Key Laboratory of Science and Technology on Microwave Imaging

China

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Yanping Wang,

Dr. Yanping Wang

Science and Technology on Microwave Imaging Laboratory

Institute of Electronics, Chinese Academy of Sciences

China

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Yirong Wu

Dr. Yirong Wu

Science and Technology on Microwave Imaging Laboratory

Institute of Electronics, Chinese Academy of Sciences

China

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Progress In Electromagnetics Research, Vol. 119, 155-170, 2011

doi:10.2528/PIER11060503

Abstract

This paper presents an improved polar format algorithm (PFA) for geosynchronous synthetic aperture radar which undergoes a near-circular track (GeoCSAR). GeoCSAR imaging geometry and signal formulation considering orbit perturbations were derived to ensure accurate slant range between antenna and targets. The illuminated area is more than one million square kilometers due to the long slant distance, resulting in large amount of data to be processed and that the scene is a spherical crown rather than a plane. By assuming spherical wavefronts instead of planar wavefronts, improved polar format algorithm (PFA) was proposed to focus GeoCSAR raw data on a spherical reference surface (ground surface), so that the size of focused scene is no longer limited by the range curvature phase error. Thus, this method could deal with large area imaging for GeoCSAR precisely and efficiently. The implementation procedure, computational complexity, phase error and achievable resolution were presented to show the focusing capabilities of this imaging algorithm. Numerical simulation was further performed to validate the feasibility of this imaging algorithm and the correctness of analysis.

Citation

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Qi Liu, Wen Hong, Weixian Tan, Yun Lin, Yanping Wang, and Yirong Wu, "An Improved Polar Format Algorithm with Performance Analysis for Geosynchronous Circular SAR 2D Imaging," Progress In Electromagnetics Research, Vol. 119, 155-170, 2011.
doi:10.2528/PIER11060503

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