Extended scintillation phase gradient autofocus in future spaceborne P-band SAR mission

作     者：Yifei JI Zhen DONG Yongsheng ZHANG Qilei ZHANG Baidong YAO Yifei JI;Zhen DONG;Yongsheng ZHANG;Qilei ZHANG;Baidong YAO

作者机构：College of Electronic Science and Technology National University of Defense Technology East China Research Institute of Electronic Engineering 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2021年第64卷第11期

页      面：216-232页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 081105[工学-导航、制导与控制] 081001[工学-通信与信息系统] 081002[工学-信号与信息处理] 0825[工学-航空宇航科学与技术] 0811[工学-控制科学与工程] 

基　　金：supported by National Natural Science Foundation of China (Grant No. 41271459) 

主　　题：synthetic aperture radar (SAR) ionospheric scintillation scintillation phase error (SPE) extended scintillation phase gradient autofocus (ESPGA) spaceborne P-band SAR 

摘      要：A future spaceborne P-band synthetic aperture radar(SAR) working system will be inevitably influenced by ionospheric scintillation, which tends to cause azimuth decorrelation and azimuth-imaging degradation. The scintillation phase error(SPE) history spatially varies by 2 D scenes, and this leads to the complexity of SPE estimation and compensation. In this paper, to address this problem, an approach based on the extended scintillation phase gradient autofocus(ESPGA) technique has been proposed. ESPGA is composed of three modules: local estimation, overall estimation, and correction. First, it employs the block PGA(BPGA) to estimate SPE associated with the local block. Second, by taking advantage of information redundancy of SPE estimates, azimuth splicing and range interpolation are applied to estimate the overall SPE distribution across the whole scene. Then, the estimation result corresponding to the overall SPE is considered to compensate the spatial-variant SPE and mitigate scintillation impacts on the spaceborne SAR images. Finally, a processing experiment based on a simulated image derived from an airborne P-band SAR real scene is conducted to demonstrate the effectiveness of the proposed methodology.