FOCUSING OF SPACEBORNE BISTATIC SAR DATA BASED ON TIME-DOMAIN PERTURBATION

被引：0
|
作者：
Lu, Zheng [1 ]
Zhu, Yu [1 ]
Wang, Yuekun [1 ,2 ]
Xu, Mingming [1 ]
Li, Tengfei [1 ]
Li, Zhenfang [2 ]
机构：
[1] Beijing Inst Spacecraft Syst Engn, Beijing 100094, Peoples R China
[2] Xidian Univ, Natl Lab Radar Signal Proc, Xian 710071, Shaanxi, Peoples R China
来源：
IGARSS 2018 - 2018 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM | 2018年
基金：
中国国家自然科学基金;
关键词：
bistatic SAR; spatial-variant; time-domain perturbation; chirp scaling; imaging; ALGORITHM;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Spaceborne bistatic synthetic aperture radar (BiSAR) system with an inclined geosynchronous (GEO) illuminator and a low-earth-orbit (LEO) receiver is capable of providing higher signal-to-noise ratio (SNR), finer resolution and vast area of surveillance. However, spatial-variant characteristics of the echo signal caused by the complex bistatic formation raise technical challenges in data focusing. To address the issue, an improved chirp scaling (CS) algorithm based on time-domain perturbation is proposed. Firstly, the signal model of GEO-LEO bistatic SAR is derived based on the geometry. Then, two-dimension (2-D) perturbation functions are employed to correct the spatial-variant characteristics of the echo signal. Finally, the phase compensation functions are generated to compensate for the residual phase. The proposed algorithm is able to implement wide-swath and high-resolution imaging. Simulation results of point targets show the validity of the presented method.
引用
收藏
页码：3699 / 3702
页数：4
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