分布式星载干涉SAR中空间基线的分析和设计

BASELINE ANALYSIS AND DESIGN FOR DISTRIBUTED SPACEBORNE INTEFEROMETRIC SAR

分布式星载干涉SAR可以同时实现三维地形成像、洋流成像和提高空间分辨率等3种SAR于涉成像。其系统基线设计需要同时考虑这3种SAR干涉成像对基线的不同要求,所以比较复杂。该文在给出分布式小卫星被动稳定编队飞行的空间构形和3种SAR干涉成像对系统基线要求的基础上,提出了分布式星载干涉SAR基线设计中存在着3个制约关系;给出了协调这3个制约关系的一种设计准则,并在此准则下对一个L波段的分布式星载干涉SAR进行了系统基线设计。

Distributed Spaceborne Interferometric SAR(DSI-SAR) can be explored to implement three possibilities of the coherent combination of SAR images, which are DEM, ocean current imaging and improving resolution in range and azimuth. So the baseline design for DSI-SAR is more complicated than that for INSAR. In this paper, formation flying of small satellites and geometry of DSI-SAR are discussed and the requirements of three SAR coherent combinations for baselines are analyzed. Furthermore, three performance trade-offs in DSI-SAR baseline design are presented. According to these trade-offs, a method to design baseline is given and applied to an L-band DSI-SAR.