地球单基ISAR对月球成像信号参数设计与仿真

Design and Simulation of Earth-Based Monostatic ISAR Lunar Imaging Signal Parameters

利用地基逆合成孔径雷达(Inverse Synthetic Aperture Radar,ISAR)对月球进行观测和成像处理,可获得月球正面的地形地貌等特征。本文首先构建了用于逆合成孔径雷达成像的地面单基雷达对月球观测的等效转台模型,分析了月球表面等效散射中心与雷达径向距离的变化特性。然后,给出了单基雷达脉冲重复频率、脉冲宽度、工作频段、带宽和采样频率等信号参数的设计准则,并建立了单基雷达对月球观测的ISAR回波模型与成像处理流程。最后,通过仿真实验验证了本文理论分析和成像算法的有效性。

The lunar near-side topography can be obtained through the observation and imaging by use of the earth-based inverse synthetic aperture radar(ISAR).In this paper,the equivalent turntable model for the lunar observation using earth-based monostatic radar is constituted from the perspective of ISAR imaging.The radial distance between the lunar equivalent scatterers and the radar is derived and analyzed.Then,the design criteria of the monostatic radar signal parameters,e.g.the pulse repetition frequency,pulse time width,working frequency band,bandwidth and sampling frequency are discussed.After that,the ISAR echo model of lunar observation using the monostatic radar is established,and the ISAR imaging algorithm is proposed.Finally,the validity of the theoretical analysis and imaging algorithm is verified by the simulation experiment.