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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.
Aiming at the distributed high frequency ground wave radar system, the calibration method of array amplitude and phase error is studied, which uses the Doppler spectrum of azimuth known direct wave signal to estimate the array amplitude and phase error without the need of estimating the covariance matrix and performing the feature Decomposition.Compared with the traditional self-calibration method using single DOA spectral points for oceanic echo calibration, the computational complexity and time loss of the method are greatly reduced.Comparison and verification of the simulation and measured data show that the method is implemented by direct wave Array amplitude and phase error calibration can obtain a stable amplitude, the phase calibration value, calibration MUSIC spectral estimation accuracy and stability has been significantly improved.