The Cartwheel interferometric SAR constellation proj ect is briefly introduced in the paper.Then the system performance requirement,operational mode,system realization,on-orbit movement and the application results of Germany TanDEM-X formation flying interferometric SAR satellite are presented.The key technologies of TanDEM-X system which are baseline deter-mination,synchronization between satellites and autonomous formation flying are detailedly in-vestigated and analyzed.Solution to the three key technologies and their achieved performance are given,and the modification suggestion for its time synchronization method is proposed.Inspira-tions for the similar system manufacture from two aspects of system design and key technology is summarized.%首先简述了"干涉车轮"(Cartwheel)干涉 SAR 星座计划的基本情况,继而针对德国X频段陆地合成孔径雷达-附加数字高程测量(TanDEM-X)编队干涉 SAR 系统的性能指标要求、工作模式、系统实现、在轨运行应用情况进行了介绍.重点针对TanDEM-X的基线测量、星间同步和自主编队控制3项关键技术采取的技术途径和达到的性能指标进行了深入调研分析,并针对其中值得改进的时间同步方法提出了具体的改进措施,最后,从系统总体设计和关键技术两方面归纳了对其他类似系统研制的启示.
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