三星编队干涉SAR测高的星间相位同步链路设计

对于三星编队干涉合成孔径雷达(SAR)地形测高,文中利用精确的Hill方程对卫星相对轨道和星间基线进行定量分析。首先,根据沿航向基线和垂直航向基线的约束确定三星编队,并同时干涉测高的工作区间;然后,根据喇叭波束宽度和三星的相对位置关系,正确切换相位同步喇叭,建立主星和两颗副星间相位同步链路,以获取两颗副星SAR成像所需的相位同步信息。其结论可为多星编队干涉SAR系统设计提供有益参考。

Design of Phase Synchronization Paths among Three Distributed SAR Satellites Measuring Terrain Height

The relative tracks and baselines are quantitatively analyzed with the accurate Hill equations of three distributed SAR satellites measuring terrain height. The working regions of three distributed SAR satellites are determined on the constraint condition of along-track baselines and cross-track baselines. On the basis of the beam width of horns and the relative positions of three distributed SAR satellites, the phase synchronization paths are built by switching the horns to acquire the compensated phase values for two slave satellites imaging. The conclusions can be regarded as a good reference in the design of the SAR systems of multiple distributed satellites.