基于"斑马图"复用技术的分布式卫星SAR波位设计方法研究

重点研究分布式卫星合成孔径雷达系统的波位覆盖设计问题。推导了精确的星间几何关系模型，针对主星发射-辅星接收的简化模型，提出了一种基于“斑马图”复用技术的设计方法：根据分布式卫星空间几何模型，将辅星雷达回避直达波及星下点回波的限制条件，在主星雷达“斑马图”（即脉冲重复频率与覆盖关系约束图）上示出，即主、辅星复用波位设计“斑马图”；在合成斑马图上选择主星雷达的波位，则可以同时满足主、辅星雷达的限制条件。该方法可以很好地解决分布式卫星合成孔径雷达对地协同探测过程中面临的获取有效测绘带回波的问题。通过计算机仿真，给出波位设计结果，验证了本文方法的有效性。

Beam Position Design for Distributed Satellite SAR Based on Multiplex Coverage Diagram

A new method of elevation angle and pulse repetition frequency(PRF) design for distributed satellites synthetic aperture radar (SAR) system was presented.The accurate geometry model of the distributed satellites was deduced.We used the predigested model of active illuminator and passive receiver.A design method based on multiplex coverage diagram was proposed: transmitting and nadir interference of the active illuminator is illustrated on coverage diagram of PRF against elevation angle by additional method,the passive receiver's echo avoiding nadir interference and pulses arrived directly from the illuminator is shown on the same plot.The proper elevation angle and PRF on the synthetic coverage diagram can meet both the illuminator's and receiver's requirements for design.This method can solve the problem of getting the effectual echo when the distributed satellites SAR detect the earth together.Computer simulation results are given and the results can validate the efficiency of the method presented in this paper.