基于平均轨道要素的干涉SAR编队构形设计方法研究

提出了一种在整个轨道周期内沿轨迹向和垂直轨迹向均存在稳定基线组合的三星编队，并在考虑J2摄动基础上给出了其轨道设计方法。依据系统任务要求给出了该队形设计的约束条件，初步确定了编队的平均轨道参数。为了使得空间基线在摄动情况下保持相对稳定，对卫星平均半长轴进行了小量修正。最后在卫星工具包（STK）下进行了高精度轨道仿真验证。结果表明，该方法设计的编队初始轨道参数能使空间基线保持稳定，在一个轨道周期内，垂直轨迹方向存在两条相同的稳定基线，沿轨迹方向存在一条稳定基线和两条周期性变化基线，能够同时满足DEM和GMTI任务要求。

Formation Configuration, Orbit Design and Baseline Performance Analysis Based on DEM and GMTI

Taken into account J2 perturbation, a novel configuration and orbit design method for distributed SAR satellite formation based on DEM and GMTI space mission is presented. According to different technical requirement, the formation flying consisted of three satellites, owning to stable along-track baseline and cress-track baselines, is designed. Then, the mean orbit elements of all formation satellites are preliminary determined. In order to maintain the stability of space baselines in perturbation environment, the mean semi-major axis of deputy satellites is little modified. Finally, mean orbit elements are transformed into osculating elements and high precision orbit simulation is verified in Satellite Tool Kit. It is indicated that novel formation configuration and formation initial orbit elements from this method can make space baselines maintain in a good condition. This formation configuration can provide with two equal stable along-track baselines and one stabled cress-track baseline and two same periodic crosstrack baselines.