低慢小目标探测时的气象干扰抑制方法研究

针对低慢小目标探测时可能出现的低速气象干扰航迹的问题，在低分辨雷达基于信号维特征的目标分类正确率偏低的情况下，提出一种基于多特征联合的气象虚警抑制方法，在目标稳定跟踪，形成稳定航迹时，联合目标的信号特征(形状、雷达散射截面积等)，航迹分布特征(气象点迹比例、速度、方向等)等多种特征，利用多圈点迹的积累，提高气象干扰航迹的正确识别率并加以抑制，同时不影响真实低慢小目标的正常检测和跟踪。实际试飞结果表明：文中提出的基于多特征联合的气象虚警抑制方法在有效抑制气象干扰航迹的同时，不影响配试无人机的正常检测和跟踪。

A Study on Weather Interference Suppression Method in the Detection of Low-altitude Slow and Small Targets

In the detection and tracking of low-altitude, slow and small (LSS) targets, the effect of tracking may be influenced by the slow weather interference tracks. For narrow-band radar, the target classification accuracy based on the signal characters extracted from the target echoes is too low to suppress the phenomenon of weather interferences. In this paper, the method based on multi-features combination is proposed for the weather interference suppression. During the tacking of targets, the echo characters (RCS, shapes of echo) and track features (weather track point rate, velocity, Doppler direction, etc.) are combined to identify and suppress the weather tracks, meanwhile, the detection and tracking of true LSS targets is not influenced. The results of flight-test experiments prove the validity of the proposed weather interference suppression method.