编队卫星InSAR系统相位定标设计研究

Research for Phase Calibration Design of a Format Flying Satellites InSAR System

编队卫星干涉合成孔径雷达(InSAR)系统具有不受国界限制,全天时、全天候获取全球陆地三维高程信息能力。InSAR系统工作期间不可避免地存在相位随温度漂移的问题,如果不采取措施进行提取和补偿,将会严重影响最终的干涉相位精度,进而影响系统的测高精度。因此,相位定标是InSAR系统实现高精度干涉测量的重要保证。文章基于编队卫星InSAR系统原理和架构,分析了雷达通道相位误差的影响,设计了相位定标链路,提出了两种实现相位定标的方案,并给出了测试结果,最后针对相位定标的工程实现给出了一些建议。

Format flying satellites InSAR system is not restricted by national boundaries,and has the ability to acquire three-dimensional elevation information of global land all-day and all-weather.The phase will drift with the change of temperature during InSAR system operation,which will affect phase accuracy and affect interferometry elevation accuracy finally if the system doesn’t adopt a measure to execute the phase compensation.So phase calibration becomes the important sponsion to achieve high-precision interferometry measuring in the InSAR system.In this paper,based on the principle and constitution of a format flying satellites InSAR system,the author analyses the influence of radar channel phase errors,presents phase calibration link,proposes two projects to achieve phase calibration,gives the test result,and puts forward some advices for engineering application in the end.