分布式小卫星雷达系统误差估计的新方法

A New Error Estimation Method for Distributed Small Satellites

相干联合处理小卫星编队雷达接收的地面回波可在获得大的成像测绘带的同时获得较高的方位分辨力,具有非常重要的军事应用前景。然而复杂的分布式小卫星雷达系统误差尤其是三维基线误差和多通道幅相误差,严重影响了联合处理各卫星回波数据的效果,甚至使其失败。针对这一问题,提出了一种新的分布式小卫星系统误差补偿方法,该方法不需要迭代运算,可在基线误差控制在分米数量级的基础上对回波信号的空间导向矢量进行准确估计。计算机仿真验证了方法的有效性。

Coherently combined processing of the echoes received by constellation of small satellite radars can obtain a wide swath of ground as well as a high azimuth resolution. However, the complicated errors, such as three-dimensional baseline errors and gain and phrase error, have a great effect on the result of the coherently combined processing of all the echoes. To solve this problem, a novel calibration and remedy method is proposed in this paper. This method can estimate and remedy the spatial steering vector of echo signals accurately on the basis of the baseline errors confined in a meter. Its validity is illustrated through com- puter simulations.