星载双基地雷达杂波建模及特性分析

Clutter modeling and characteristic analysis of spaceborne bistatic radar

星载双基地雷达对增强隐身目标的雷达散射截面等有更大的优势,但其杂波较单基地星载雷达杂波分布更为复杂。为了解决星载双基地雷达的问题,建立了以地球模型为基础、以地心和双卫星连线中点为原点的两个直角坐标系,通过联立构造的椭球面方程和参数方程建立了星载双基地雷达几何模型,提出了基于构建的星载双基地雷达模型的杂波多普勒频率构建方法,最后具体分析了工作频率的变化对多普勒频率的影响。与现有模型相比,所提模型简化了运算过程,需已知的参数信息相对较少,可适用于更多双/多基地场景。仿真结果表明双基地距离和取值越大或工作频率取值越大,杂波展宽越严重。

Spaceborne bistatic radar has greater advantages such as enhancing radar cross section of stealth target.The clutter distribution of spaceborne bistatic radar is more complex than that of the spaceborne radar.In order to solve the problem of spaceborne bistatic radar clutter,two coordinate systems are established.Both are based on the earth model,and one takes the center of the earth as the origin,and the other is based on the midpoint of the line between two satellites as the origin.The geometric model of the spaceborne bistatic radar is established by using the corresponding ellipsoid equation and parameter equation and the clutter Doppler frequency construction method based on the constructed spaceborne bistatic radar model is proposed.Finally,the influence of operating frequency on Doppler frequency is analyzed.Compared with the existing models,the proposed model simplifies the operation process,requires less known parameter information and can be applied to more bistatic/multistatic scenarios.Meanwhile,the simulation result shows that the larger the value of the isometric contour or the larger the value of operating frequency,the more serious the clutter broadening becomes.