星载双基地雷达空时二维杂波建模和特性分析

建立了星载双基地雷达杂波模型，考虑了卫星椭圆轨道、地球表面弯曲、地球自转、距离模糊以及收发几何配置等因素对杂波的影响．基于该模型对星载双基地雷达杂波的空时二维特性及其对空时二维自适应处理(STAP)性能的影响进行了仿真分析，结果表明，星载双基地雷达的杂波分布具有空变性和时变性; 这些特性以及距离模糊都会导致系统抑制杂波性能的下降．另外，当接收阵列阵元都放置在一颗卫星上时，由于接收阵列的低空间分辨率导致难以检测低速目标，仿真结果表明，将接收阵列空间超稀疏分布(分布式小卫星)可以很好的解决这一问题．

Clutter modeling and analysis for spaceborne bistatic radar

This paper presents a new clutter model for bistatic spaceborne radar, which takes into account the influences of the elliptic orbits of the satellites, the curving surface of the earth, the earth rotation, the range ambiguity and the geometry of the bistatic radar system on clutter and STAP performance. Based on the model proposed in this paper, an analysis of the characteristic of ground clutter is made. Simulation results show that the space-time distribution of clutter would vary with range and time, which, along with range ambiguity would result in the performance degradation of clutter cancellation. And the GMTI is unachievable if the elements of the receive array are all mounted on one satellite due to its serious Doppler frequency ambiguity and inadequate spatial resolution, which could be resolved by mounting the elements of the receive array sparsely on many distributed small satellites.