OTH雷达中自适应对消器抑制干扰技术研究

Interference Suppression Technology by Adaptive Canceler in OTH Radar

超视距雷达中 ,带宽的选择受到密集的大功率干扰的限制 ,很难找到满足距离分辨力要求且未污染的干净频带 ,从而导致了低的距离分辨力和信干比。本文分析了凹口滤波器零陷干扰时干扰的功率、频宽和位置对脉压输出旁瓣的影响。提出在给定的带宽内用自适应对消器抑制窄带干扰的方法。仿真结果表明 :该方法较好地抑制了干扰且不损失信号能量 ,脉压后旁瓣大大降低 。

In Over the Horizon (OTH) radar, the band is limited to lots of crowded and powerful interference. It is difficult to find an uncontaminated wide band, which leads to low range resolution and lower signal to interference ratio(SIR).This paper analyzes the degradation of pulse compression sidelobe due to the interference input power, bandwidth and location when notch filter is used. The adaptive interference cancellation technology within a required bandwidth is presented. It followed that this method can eliminate interference while not causing signal loss and can lead to lower sidelobe after pulse compression. The detection probability has increased greatly.