线阵 SAR 三维成像分辨率分析

摘要

Linear array antennas synthetic aperture radar (LASAR) can acquire the echoes of the target from different observation angles, and it can realize three-dimensional (3D) imaging for the targets.In order to get the 3D images with high resolutions, the relationship between the resolutions and the observation geometry is studied in this paper.Firstly, the signal model for LASAR 3D imaging is derived, and the 3D resolutions related with the geometry of the LASAR are obtained.Then the variance of the resolution in the elevation direction with array antenna angle and referenced look angle is analyzed.And then we conclude that the best resolution is obtained when the array antenna angle is equal to the referenced look angle.Finally, the simulation results of LASAR 3D imaging with MATLAB software are given, and the resolutions of 3D imaging under different observation geometry are analyzed and compared.%研究阵列无线 SAR 系统优化问题,关于线阵合成孔径雷达(SAR)使用阵列天线获取观测目标不同入射角的回波信号,能够实现对目标的三维成像.为了获取高分辨率的三维成像结果,研究了线阵 SAR 三维成像分辨率与观测几何的关系.采用线阵 SAR 实现三维成像的信号模型,得到了与线阵 SAR 几何相关的三维分辨率,根据高度向分辨率随着参考视角和线阵角度的变化,得到在线阵角度的三维成像分辨率.并运用运用 MATLAB 仿真平台进行了线阵 SAR 三维成像仿真,结果表明目标三维成像得到了高分辨率的结果.