一种天基双基地InSAR系统的相位同步方法及验证情况  

A Study and Test Results on a Phase Synchronization Method of a Space-borne Bistatic InSAR System

作　　者：来驰攀[1] 刘爱芳[1] 江涛[1] 林幼权[1] LAI Chipan;LIU Aifang;JIANG Tao;LIN Youquan(Nanjing Research Institute of Electronics Technology,Nanjing Jiangsu 210039,China)

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《现代雷达》2024年第4期15-21,共7页Modern Radar

摘　　要：以德国的TanDEM-X双星编队干涉合成孔径雷达(InSAR)卫星系统为背景,提出了基于点频连续波同步信号双向对传,实现编队卫星InSAR系统相位同步的方法。文中给出了该同步方法实现的框架,对该相位同步方法的原理进行了理论推导,得出了补偿相位差的表达式,并对影响同步精度的因素进行了初步的分析。该方法可用于天基双/多基地合成孔径雷达系统相位同步链路的设计,仿真分析的结果验证了该方法的理论可行性。此外,通过搭建实物系统对系统的工程可实现精度进行了验证,结果表明获取的载波频率相位同步精度与倍频器件的频率精度和一致性密切相关。该相位同步方法为与TanDEM-X相近InSAR系统的设计提供参考。Based on the parameters of Germany′s TanDEM-X format flying satellites Interferometric synthetic aperture radar(InSAR)system,the method of phase synchronization of InSAR system by single frequency continuous wave duplex is addressed.The framework for the implementation of this synchronization method is given in the paper,the expressions of the theory on the phase synchronization method are deduced,and the factors of effects on the accuracy of the synchronization method are simply analyzed.This phase synchronization method can be used to space-borne bi-static and multi-static SAR synchronization link design.The synchronization method is validated by numerical simulations.Moreover,the engineering accuracy is tested and verified through an experimental system.Results show that the accuracy of phase synchronization on carrier frequency is depend on the frequency accuracy and consistence of frequency multiplier.The method of phase synchronization can be used to the design of systems similar to TanDEM-X or other similar systems.

关 键 词：编队卫星 合成孔径雷达 干涉合成孔径雷达 相位同步 双基地雷达 

分 类 号：TN959.74[电子电信—信号与信息处理]