基于方位向多通道星载ScanSAR的MCECS算法  

Multiple channels extended chirp scaling algorithm for spaceborne multi-channels data processing in ScanSAR mode

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：《北京航空航天大学学报》2011年第10期1196-1201,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：教育部"新世纪优秀人才"支持计划资助项目(NCET-06-0166);领航创新基金资助项目(YWF-10-01-A24)

摘　　要：针对如何实现星载合成孔径雷达(SAR,Synthetic Aperture Radar)超宽测绘带的问题,对多通道星载SAR扫描模式开展研究.在分析该模式特点的基础上提出了实现超宽测绘带的方法,并推导了多通道扫描模式成像处理算法(MCECS,Multiple Channels ExtendedChirp Scaling).该算法利用内定标数据校正通道间的幅相不一致性,通过滤波方法完成了方位向非均匀采样信号的重构.在采用修正的天线长度进行"扇贝效应"校正以及精确聚焦处理后,通过求解四次方程的方法对图像进行快速地理编码,并完成图像的拼接.最后利用计算机仿真验证了算法的有效性.Aimed at the realization of ultra-wide-swath, the operation of spaceborne multi-channels synthetic aperture radar（SAR） systems in ScanSAR mode was studied. Based on the characteristic analysis of the mode, a new method of ultra-wide-swath was presented as well as the imaging algorithm （MCECS, multiple channels extended chirp scaling）. The algorithm calibrates amplitude and phase difference among receivechannels by internal calibration data and reconstructs nonuniformly sampled signal in azimuth by filter banks. After Scalloping remedy by applying the amendatory length of antenna and accurate focusing, it enabled the subswaths combination after image geocoding by solving the quartic equation. Finally, computer simulations show the validity of the algorithm.

关 键 词：合成孔径雷达 多通道天线 超宽测绘带 非均匀采样 

分 类 号：TN957[电子电信—信号与信息处理]