同时地形高程测量和地面运动目标检测的分布式InSAR最优编队构形

分布式小卫星干涉SAR为了同时获得时间基线(用于地面运动目标检测)和空间基线(用于地形高程测量),采取空间立体编队构形(即非沿航向直线编队),然而这种混合基线的情况会导致地面运动目标与地形杂波存在相位耦合,而且只靠信号处理方法很难分离,这对于检测地面运动目标极为不利。提出几种最优编队构形,在保证获得两种干涉基线的同时,通过对消两对干涉SAR图像来抑制掉固定杂波,从而可以检测地面运动目标,这种方法具有处理简单和性能较好等优点。最后给出了仿真结果。

The optimal formation configurations for both GMTI and DEM using distributed satellites InSAR

The distributed small satellite synthetic aperture radar (SAR) is a cluster of formation-flying small satellite SARs that cooperate to perform multiple space mission functions,such as ground moving target indicator (GMTI) and digital elevation model (DEM),and its functions and reliability exceed a larger,single-satellite SAR.To obtain along-track baseline and cross-track baseline at the same time,the small satellites in a formation must be distributed in two-dimensional or three-dimensional space,which would cause combined ATI/XTI phase.And it is difficult to suppress the ground clutter and detect ground moving targets in the present of combined ATI/XTI phase.The separation of the phase of topography and targets motion is very difficult by only using signal processing approaches.In this paper,several optimal formation configurations are presented and then a signal processing approach is used to detect gound moving targets.The simulated results are also given in this paper.