天地波高频超视距雷达阵列校准方法

A Calibration Method of Amplitude and Phase Errors for HF-OTHR Array

针对天地波高频超视距雷达系统,研究了阵列幅相误差的校准方法。利用方位已知的直达波信号得到的幅相误差值,可以用来对天线阵列进行校准。而在实际雷达工作中,信号会受到杂波和环境影响从而导致校准值的稳定性变差。因此,采用对应时刻的校准值直接补偿会带来较大的误差。针对传统直接补偿存在的缺陷,提出了一种改进方法。该方法采用高斯函数累加模型对每个时刻校准值进行优选,从而达到校准值优化的目的。试验结果表明,该方法能够提高海流结果的准确性。

In this paper,the calibration method of amplitude and phase errors for HF-OTHR is studied.The amplitude and phase error values obtaind by use of direct wave signal of known azimuth can be used to calibrate the antenna array.While in the actual radar working environment,the stability of calibration is worse because the signal is affected by clutter and noise.Therefore,the direct compensation using the calibration values at the corresponding time will lead to greater errors.In view of the drawback of traditional direct compensation,an improved method is proposed.The method uses GFAM(Gauss Function Accumulation Model)to optimize the calibration values at each time,so as to achieve the optimization of calibration values.The experimental results show that this method can improve the accuracy of ocean current results.