聚束SAR的快速卷积反投影成像算法

Fast Convolution Backprojection Algorithm for Spotlight Synthetic Aperture Radar

本文对应用于聚束SAR成像的卷积反投影 (CBP)算法进行了详细研究 ,采用子孔径处理的方法 ,使得这种算法的计算量得到明显的降低 .同时 ,对计算过程的分析表明CBP算法中所涉及的数量巨大的乘法运算可以用加法运算代替 ,加法操作又可以简单有效地利用可编程逻辑器件进行并行处理 .通过上述改进 ,CBP算法成像处理在计算量降低的同时 ,硬件结构也得到了很大的简化 .论文同时给出了大前斜视角情况下的处理方法、点目标仿真和利用快速CBP算法对E SAR原始数据的成像结果 .

In this paper,one of spotlight SAR image formation algorithms,the convolution backprojection (CBP) algorithm,is studied in detail.The subaperture method is proposed to reduce computation load.At the same time,the multiplication,the number of which is very large when using CBP,is mainly substituted by addition which can be parallelly processed using commonly used FPGA or CPLD.The method for processing high squinted angle is also presented and results got from processing raw data of DLR's E-SAR system have validated the improvements described above.