To analyze several key problems about effectiveness analysis of spaceborne parasitic SAR system, firstly, an index system of effectiveness assessment is established based on the mission request of distributed SAR system; 针对主星带伴随分布式小卫星系统效能分析中几个关键问题进行了研究。首先,根据分布式小卫星SAR系统的任务需求,给出了系统效能评估指标体系;