分布式高频地波雷达阵列幅相误差的校准方法  

A Calibration of Gain and Phase Errors for Distributed HFSWR Array

作　　者：刘斌[1] 吴雄斌[1] 徐全军 龙超[1] 李伦[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]总参气象水文局,北京100073

出　　处：《武汉大学学报（理学版）》2012年第3期269-274,共6页Journal of Wuhan University:Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)(2012AA091701);国家自然科学基金(60571065);武汉大学博士研究生自主科研项目资助

摘　　要：针对分布式高频地波雷达系统,研究了阵列幅相误差的校准方法.该方法利用方位已知直达波信号的多普勒谱来估计阵列幅相误差,不需要估计协方差矩阵和进行特征分解.与利用海洋回波中的单DOA谱点进行通道校准的传统自校准方法相比,该方法的计算量和时间损耗大大地降低.仿真和实测数据的对比验证分析表明了通过直达波进行阵列幅相误差校准可以获得稳定的幅度、相位校准值,校准后MUSIC谱估计的准确性和稳定性得到明显的提高.To calibrate the array errors with gain and phase uncertainty for distributed HFSWR, a calibration approach for evaluating the gain-phase errors is presented in this paper. Using the known position direct wave signal＇s Doppler spectrum to estimate the array gain-phase errors, it is no use to estimate the eovariance matrix and eigende- composition. Compared with the channel calibration using sea echoes＇with single DOA, the method has a small amount of computation and it is easy to be implemented. Comparative validation analysis of simulation and measured data show that the direct wave calibrate array calibration of gain and phase errors can get a stable amplitude, phase calibration value, MUSIC spectral estimation of calibration accuracy and stability are significantly improved.

关 键 词：分布式高频地波雷达 阵列校准 幅相误差 直达波 MUSIC算法 

分 类 号：TN958.93[电子电信—信号与信息处理]