分布式小卫星SAR回波信号仿真

Simulation of Echo Signal in Distributed Satellite-borne SAR

基于分布式卫星的空间构形及相对运动,在地心赤道坐标系内分析了卫星平台与地面目标之间的瞬时距离、相对速度及加速度变化规律,给出一种基于编队构形的分布式小卫星SAR目标回波信号产生的方法,并用距离—多普勒算法进行成像。这为进一步研究基于分布式卫星SAR的动目标检测性能提供了数据基础,有助于编队卫星SAR系统参数设计和选择。

Based on spatial configuration and relative movement in the distributed satellites, a set of analytical formulas, which calculate instantaneous ranges and relative velocities and accelerations between satellite-borne SAR and targets on the earth, were derived in the Earth-Centered lnertial reference frame. A simulation method of satellite-borne SAR echo signal was proposed based on formation scheme in the distributed satellites, The simulated image was acquired by Range-Doppler imaging algorithm. The echo signal of scenes on the earth with overlaid moving point targets was simulated, in order to study new moving target detection theories for distributed satellite-borne SAR. At the same time, the work contributed to parameters design and performance analysis of the system.