Focusing and Parameter Estimation of Fluctuating Targets in High Resolution Spaceborne SAR
Wen Xuejiao,
Qiu Xiaolan,
You Hongjian,
Lu Xiaojun
Affiliations
Wen Xuejiao
①(Key Laboratory of Geo-spatial Information Processing and Application System Technology, Beijing 100190, China) ②(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ③(University of Chinese Academy of Sciences, Beijing 100049, China)
Qiu Xiaolan
①(Key Laboratory of Geo-spatial Information Processing and Application System Technology, Beijing 100190, China) ②(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
You Hongjian
①(Key Laboratory of Geo-spatial Information Processing and Application System Technology, Beijing 100190, China) ②(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
Lu Xiaojun
④(China International Engineering Consulting Corporation, Beijing 100048, China)
Complex motion can cause serious defocusing phenomena in high resolution spaceborne SAR cases, which then lead to decreased image resolution. In this study, we built a simulation model to quantitatively analyze the signature and effect on maritime fluctuating targets in high resolution cases. To deal with formed Single-Look Complex (SLC) SAR images containing fluctuating targets, we implement a motion-compensation and fine-focusing method to obtain refocused images and the fluctuation parameters. We demonstrate the effectiveness and correctness of the proposed approach in focusing and estimating the parameters of fluctuating targets by processing the simulation results and archived images acquired by Terra-SAR in hybrid spotlight mode.
