双基地高频地波雷达海杂波抑制

Ocean clutter suppression for a bistatic HF ground wave radar

摘要:

由于地貌、双基角和洋流等因素的影响,双基地海杂波形成的目标检测盲区会导致杂波被当作目标来检测和跟踪,形成大量的虚假目标.针对这一问题,提出一种快速抑制杂波方法:利用双基地海杂波频率特征的先验知识,结合海面的平稳特性,在距离多普勒(RD)谱上获取海杂波抑制的频率范围;应用Clean算法,先对通道时域数据进行海杂波抑制,之后进行数字波束形成,得到能够正常进行目标检测的谱数据.实际处理结果表明,该方法快速有效,能够实时进行数据处理.

Abstract:

For a bistatic HF radar,the bistatic angle,ocean current and physiognomy of receiver location will bring about the Bragg lines’ spreading,peak split and peak shift,so that the first order ocean clutter will be detected and tracked as a false target in some cases.To solve this problem,a fast method is proposed to suppress the ocean clutter.Based on some priori knowledge and stationary properties of the ocean surface,the ocean clutter frequency range to be suppressed was obtained on the Range-Doppler(RD) spectra.Then the Clean algorithm was applied to suppress the ocean clutter on the un-beam-formed channel data,after that the digital beam forming was performed and the obtained data were more helpful for target detection.The results show that this method is valid and can be implemented for real-time operation.