基于毫米波LFMCW雷达散射计的地杂波测量方法

Ground clutter measurement method with millimeter wave LFMCW radar scatterometer

研究毫米波雷达的地杂波特性对提高毫米波雷达的目标探测性能和大地遥感具有重要的作用。针对毫米波雷达地杂波测量问题,讨论了地杂波散射系数测量方法,对毫米波线性调频连续波(linear frequency modula-tion continuous wave,LFMCW)雷达散射计的系统校准、有效独立采样数、数据处理中软件门的应用以及减少测量误差等相关技术进行了研究;给出了Ka波段散射计测量灌木丛杂波特性的结果,结果表明在入射角小于15°范围内灌木丛的杂波幅度分布服从瑞利分布。

It is very important to explore the ground clutter characteristics at a millimeter wave（MMW） band for improving both radar target detection performances and earth remote sensing. Aiming at the problem existing in the ground clutter measurement method of an MMW LFMCW radar scatterometer, this paper is focused on the system calibration, selection of effective independent sampling numbers, application of the software gate in data processing, and decrease in measurement errors. The measured results of the bush backscatter with a Ka-band LFMCW scatterometer are analyzed. The results show the bush clutter amplitude is subordinate to a Rayleigh distribution when the incident angle is less than 15°.