相干雷达高度表大地回波去相关研究与实验  

Study and Experiment of Coherent Radar Altimeter Terrain Return Decorrelation

作　　者：李娟[1] 张海[2] 陈祝明[1] 段锐[1] 成彬彬[2] 

机构地区：[1]电子科技大学电子工程学院,成都611731 [2]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《现代雷达》2012年第5期73-76,共4页Modern Radar

基　　金：国家自然科学基金委员会与中国工程物理研究院联合基金(NSAF)资助项目(10776003)

摘　　要：由于非刚体目标自身的变化或者刚体目标与雷达之间的距离、视角发生变化都会产生大地回波去相关现象。文中针对上述现象建立了大地回波的几何与幅度起伏模型,对机载相干雷达高度表回波特性进行了仿真研究。文中还利用S波段相干脉冲散射计开展了大地回波测量实验,对回波数据进行了相干处理,并对仿真结果进行了实验验证。仿真与实验的结果表明:大地回波的去相关损失取决于地面粗糙度以及载机在一个脉冲重复周期内移动的距离。Terrain return decorrelation is generated by the changes of non-rigid objects themselves or the distances and viewing an- gles between rigid objects and radar. In this paper, the geometric and amplitude fluctuation model of terrain surface is built, and then the characteristics of radar altimeter terrain return are simulated by the model. On this basis, an experimental program to measure the terrain return is carried out to verify the correctness of simulation results by using coherent pulsed S-band scatterome- ter. And the return data is processed eohenrently. The simulation and experimental results show that the terrain return incoherent loses depend on both the surface roughness and the distance that the aerialcarrier moved in a PRI.

关 键 词：去相关 积累增益 相干脉冲散射计 

分 类 号：TN957.51[电子电信—信号与信息处理]