多基站星载InSAR系统通道幅相一致性研究

Research on Channel Amplitude and Phase Consistency of Multi-base Station Spaceborne InSAR System

多基站星载干涉合成孔径雷达(InSAR)系统因具有全天时、全天候获取全球陆地三维高程信息能力,近年来受到越来越多的关注。为了增加单个轨道圈次内工作时间,系统采用主辅星交替发射模式,但该模式对合成孔径雷达(SAR)系统通道幅相一致性提出了较高的要求。针对已有文献中SAR系统缺少关键子系统和高低温实测结果的缺憾,文章分析了InSAR系统干涉精度影响因素,研究了测试方案,开展了系统实测与评估,并给出了不同温度下通道幅相一致性测试结果。文章对多基站星载InSAR系统测试研究具有借鉴意义。

Because of the ability to acquire three-dimensional elevation information of global land all-day and all-weather,multi-static spaceborne InSAR system is gaining more and more attention in recent years.In order to add working time in each orbit,the system uses the method to transmit signal alternately by master and slave satellites,but higher requirements are placed on channel amplitude-phase consistency of the system.Targeting at the SAR system lacks the key subsystems and the high and low temperature measurement results in the existing literature,this paper analyses the factors affecting of the InSAR interferometry accuracy,researches the test methods,implements the system test and evaluation,and gives the test result of channel amplitude-phase consistency at high and low temperature.This paper will benefit the research for multi-static spaceborne InSAR system test.