天波超视距雷达抑制非瞬态流星余迹干扰研究

An approach to suppressing meteor trails interference in the over-the-horizon radar

工作在高频波段的超视距雷达会受到流星余迹的干扰,这种干扰严重影响了超视距雷达接收机的正常工作.对于欠密类流星余迹形成的瞬态干扰,已经有了有效的抑制方法.但对于过密类余迹或多个欠密类余迹混合而形成的长持续时间的干扰,目前尚未提出有效的抑制方法.针对流星余迹干扰的特点,利用特征子空间理论,提出了有效消除非瞬态流星余迹干扰MTI滤波的方法.实测数据的仿真结果表明了这种算法的有效性和实用性.

The meteor trails often interfere with the OTH Radar in the high frequency band, which leads to the receiver of the OTH Radar not working normally. There are some special methods for eliminating underdense meteor trails interference. However, no effective method is proposed for getting rid of long time interference caused by overdense meteor trails or the combination of several underdense meteor trails. An effective approach based on MTI filtering to eliminating nontransient meteor trails interference is presented using the theory of eigen subspace after analyzing the feature of the meteor trails in detail. Simulation results in real data show that the proposed method is efficient and practical.