分布式星载干涉SAR相位同步  

Research on Phase Synchronization of Bistatic Spaceborne Interferometric SAR

作　　者：王政 李世强 WANG Zheng;LI Shiqiang

机构地区：[1]中国科学院空天信息创新研究院,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《科技创新与应用》2024年第27期11-17,共7页Technology Innovation and Application

摘　　要：主星与辅星之间雷达载波的相位同步是分布式星载干涉合成孔径雷达需要解决的重要问题之一。为实现星间相位同步,该文提出一种基于连续波对传的相位同步方法。首先,采用连续波信号对传能够获得更高的同步信号信噪比,能够提升相位同步重复频率,避免插值处理;其次,相位同步工作在中频,能够简化系统天线配置;同时,采用GPS驯服晶振使频率源一致性优于10-10。地面验证试验结果显示,该方法同步后剩余相位误差为1.68°(1σ),具有良好的同步性能。The phase synchronization of radar carriers between main satellite and auxiliary satellite is one of the important problems to be solved in bistatic spaceborne interferometric synthetic aperture radar(InSAR).In order to realize inter-satellite phase synchronization,a phase synchronization method based on continuous wave(CW)pair transmission is proposed in this paper.First of all,the use of CW signal pair transmission can obtain a higher signal-to-noise ratio of the synchronous signal,improve the phase synchronization repetition frequency and avoid interpolation processing;secondly,the phase synchronization works in the intermediate frequency,which can simplify the antenna configuration of the system;at the same time,using GPS to tame the crystal oscillator makes the frequency source consistency better than 10-10.The ground verification test results show that the residual phase error of the method is 1.68°(1?滓),with good synchronization performance.

关 键 词：分布式SAR 相位同步 连续波对传 信噪比 天线配置 

分 类 号：TN957.52[电子电信—信号与信息处理]