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 interferometric SAR
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摘要: 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。Abstract: Distributed Spaceborne Interferometric SAR(DSI-SAR) can be explored to imple-ment 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.
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