基于自动识别系统信息相关系数法的阵列幅相误差校准方案

An Array Gain and Phase Error Calibration Scheme Based on Correlation Coefficient Method of Automatic Identification System Information

针对高频地波雷达系统的工程应用,提出一种基于自动识别系统(automatic identification system,AIS)信息相关系数法进行阵列幅相误差校准的方法。该方法利用低信噪比的舰船回波信号,可以实现同步校正,不需要专门部署应答器,且成本低,对于不能借助直达波校准的单基地高频地波雷达系统同样适用。分析现场的实测数据结果表明,通过该方法对阵列幅相误差进行校准可以获得稳定的幅度、相位校准值,校准后多信号分类(multiple signal classification,MUSIC)空间谱估计方位角的准确性和分辨率得到大幅度提高,进而显著改善利用MUSIC算法估计海流方位角的高频地波雷达系统海流探测性能。

An array calibration scheme based on correlation coefficient method of Automatic Identification System(AIS)information was proposed for the engineering applications of high frequency surface wave radars(HFSWR).The method utilized low signal-to-noise ratio(SNR)ship echo signals and achieved synchronization calibration.In addition,the scheme did not require special deployment of transponders and had a low cost.It was also suitable for monostatic HFSWR which cannot be calibrated by direct wave.The field measured data were analyzed.Results show that after the proposed method calibrate array gain and phase errors a stable amplitude,phase calibration value can be obtained.After calibration,the accuracy and resolution of the azimuth estimation of multiple signal classification(MUSIC)spatial spectrum are greatly improved,and the ocean current detection performance of HFSWR using MUSIC algorithm to estimate the azimuth of currents is significantly improved.