一种分布式小卫星SAR单视复图像信号仿真方法

Quick method of distributed small satellite synthetic aperture radar single-look complex image simulation

总结了分布式小卫星合成孔径雷达(DSS-SAR,Distributed Small Satellite Syn-thetic Aperture Radar)回波信号仿真所需具备的基本功能.给出了DSS-SAR的空间几何模型和信号模型.空间几何模型由描述小卫星编队构形的Hill方程给出,信号模型由单视复图像信号模型、信号相关性模型和干涉相位的统计特性共同描述.结合空间几何模型和单视复图像信号模型,提出了一种简洁的DSS-SAR单视复图像信号的仿真方法.该仿真方法中,小卫星的空间位置是根据虚拟中心空间位置和小卫星的编队构形计算得到,因此仿真时能够任意设置小卫星群的编队构形.通过对圆锥三维地形和平地两种地面场景的进行回波信号仿真,结果表明该仿真方法不但能够实现DSS-SAR信号仿真必须具备的功能,而且还具有实现简洁、误差加入方便等优点.

The basic requirements for echo simulation of DSS-SAR（distributed small satellite synthetic aperture radar） were concluded. The geometry model and signal model of DSS-SAR were presented. Hill equation was employed to illustrate the configuration of small satellites. Single-look complex image signal model, correlation of DSS- SAR echoes and interferometric phase probability density function were given to show the signal characteristics of DSS-SAR. A quick method was proposed to simulate single-look complex images of DSS-SAR. The method calculated positions of small satellites with the position of the central point and the small satellite configuration. It can simulate the single-look complex image signal of the arbitrary formation small satellite cluster conveniently. The flat and conical terrains were chosen, and the simulated single-look SAR（sythentic aperture radar） complex images were obtained with the proposed method. Computer simulation results show the simulation method not only satisfies the DSS- SAR signal simulation needs, but adds many kinds of error conveniently and simulates signal realistically.