一种适用于MIMO SAR的改进极坐标格式算法  

A Modified Polar Format Algorithm for MIMO SAR

作　　者：鲍悦 刘晓东 丁城城 王海军 BAO Yue;LIU Xiao-dong;DING Cheng-cheng;WANG Hai-jun(Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011

出　　处：《舰船电子对抗》2023年第1期68-73,共6页Shipboard Electronic Countermeasure

摘　　要：多输入多输出(MIMO)合成孔径雷达(SAR)系统采用多个通道收发信号,在空间上增加采样点数,其脉冲重复频率可远低于多普勒带宽,从而同时获取高分辨率宽测绘带SAR图像。MIMO SAR采样信号成像处理前,需进行时域或频域预处理以重建无模糊的信号频谱,这增加了系统的运算量。分析了MIMO SAR回波信号模型及传统极坐标格式算法原理,提出了一种适用于MIMO SAR改进的极坐标格式算法。该算法将预处理操作嵌入成像过程,具有较高的计算效率。仿真结果验证了该方法的可行性和有效性。The multiple-input multiple-output(MIMO) synthetic aperture radar(SAR) system uses multiple channels to transmit and receive signals, increases the number of sampling points in space, and its pulse repetition frequency(PRF) can be much lower than the Doppler bandwidth dramatically, thus high-resolution wide-swath(HRWS) SAR images will be provided at the same time.Before MIMO SAR sampling signal imaging processing, time domain or frequency domain preprocessing is needed to reconstruct the signal spectrum without fuzziness, which increases the computation load of the system.This paper analyzes the echo signal model for MIMO SAR and the principle of traditional polar format algorithm(PFA),proposes a modified polar format algorithm to improve the MIMO SAR data.The new algorithm embeds preprocessing operation into the imaging process, therefore possesses higher computational efficiency.Simulation results verify the feasibility and effectiveness of the method.

关 键 词：合成孔径雷达 多输入多输出 高分宽幅 极坐标格式算法 

分 类 号：TN957.52[电子电信—信号与信息处理]