电子学报

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最大相干波束同步方法及其性能验证研究

张永俊1, 黄海风2, 张永胜2, 梁甸农2   

  1. 1. 中国人民解放军61886部队, 北京 100084;
    2. 国防科学技术大学电子科学与工程学院, 湖南长沙 410073
  • 收稿日期:2010-07-05 修回日期:2012-05-23 出版日期:2012-08-25 发布日期:2012-08-25
  • 作者简介:张永俊 男,1982年生于陕西咸阳,工程师,博士,主要研究方向为干涉SAR、星载分布式SAR系统理论与三同步技术等. E-mial:yj_zhang@nudt.edu.cn

Maximum Coherence Illumination Synchronization Method and its Performance Verification

ZHANG Yong-jun1, HUANG Hai-feng2, ZHANG Yong-sheng2, LIANG Dian-nong2   

  1. 1. The 61886 Unit of PLA, Beijing 100084, China;
    2. College of Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China
  • Received:2010-07-05 Revised:2012-05-23 Online:2012-08-25 Published:2012-08-25

摘要: 波束同步是分布式InSAR系统的关键技术之一.本文提出一种基于最大相干系数的星载分布式InSAR系统波束同步方法.分析了该波束同步方法下,双站多普勒中心频率的计算方法及双站图像信噪比的损失.进而从干涉图像对去相干、干涉处理中的独立视数以及干涉时刻配准误差的影响几个方面指出该方法相对于传统波束同步方法的优势,并进行了InSAR全流程信号级仿真验证.仿真结果表明,该方法可以有效提高分布式InSAR系统的测高定位精度.

关键词: 分布式InSAR, 波束同步, 相干系数, 性能分析, 系统仿真

Abstract: Illumination synchronization is the key technology for distributed interferometric SAR systems.A novel illumination synchronization method based on the maximum coherence is proposed.Then,the Doppler centroid frequency and the image SNR loss of bistatic mode SAR are analyzed theoretically.The advantages of the method compared with the traditional illumination synchronization method are presented by analyzing the effect of the interferometric image pair coherence、the number of independent looks for interferometric phase estimation and the error of interferometric coregistration time.A simulation which contains full process of InSAS system is carried out,The simulation results indicate that this method can improve the interferometric performance of the distributed InSAR system effectively.

Key words: distributed InSAR(interferometric SAR), illumination synchronization, coherence, performance analysis, system simulation

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