移变模式双站SAR信号模型及电磁仿真研究

Variant Bistatic SAR Signal Model and EM Simulation

针对移变模式下的双基地合成孔径雷达成像方法及电磁仿真进行了研究。在这一模式下对双基地SAR信号频谱进行分析,结合改进的Loffeld模型进行点目标回波信号分析及成像仿真。与此同时,通过物理光学方法获得三维目标的双基地回波信号,在此基础上分别采用原始与改进的Loffeld模型进行了双站SAR电磁成像仿真实验。点目标及电磁仿真结果均表明,与传统的Loffeld模型相比,改进的Loffeld模型在双基地移变模式下具有更为优良的聚焦性能。

The paper studies variant bistatic synthetic aperture radar（SAR） imaging method and EM simulation.After analyzing spectrum variant bistatic SAR signal,based on extended Loffeld＇s bistatic,point target echo signal and EM simulation are conducted.Meanwhile,bistatic echo signal of 3D target is gained through physical optics.Conventional LBF and extended Loffeld＇s bistatic formula（ELBF） are adopted respectively to conduct variant bistatic synthetic aperture radar（SAR） imaging method and EM simulation.Results of target and EM simulation show that the ELBF has better focusing property compared with the conventional LBF.