时钟同步对星载多通道合成孔径雷达成像影响  

Effects of time synchronization on image quality of spaceborne multi-channels SAR

作　　者：杨威[1] 李春升[1] 陈杰[1] 王鹏波[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电波科学学报》2011年第4期636-640,821,822,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.60901055)

摘　　要：主要分析了时钟同步对方位向多通道星载合成孔径雷达(SAR)成像质量的影响。结合星载多通道SAR系统对时钟同步误差进行数学建模,阐述了时钟同步对星载多通道SAR图像的影响方式。通过数学推导分析了方位向成对回波的幅度及位置,并指出了时钟同步误差对方位向主瓣压缩性能的影响具有周期性,同时还会导致距离向主瓣压缩性能恶化。在此基础上,进一步研究了时钟抖动对成像质量的影响。最后,计算机仿真验证了理论分析结果的正确性。This paper discusses the effects on image quality of multi-channel space- borne synthetic aperture radar （SAR） caused by time synchronization error. First,a synchronization model is built combined with spaceborne multi-channel SAR system,and the influence mode of time synchronization on SAR image is also illuminated. Then,the amplitude and position of paired-echoes in azimuth are analyzed by mathematic derivation,and the periodic effects on azimuthal main lobe are illuminated as well. Moreover,the performance deterioration of main lobe in range are presented resulted from time synchronization error, and effects on image quality caused by time jitter is researched. Finally, the simulation results justify the validity of the analysis.

关 键 词：合成孔径雷达 多通道 时钟同步 成对回波 

分 类 号：TN957[电子电信—信号与信息处理]