远区雷电是高频雷达的主要干扰源之一,需要加以抑制。该文根据雷电干扰的奇异性提出了通过计算方向分形维在分维上来区分雷电干扰和杂波信号。根据雷电干扰的瞬时分布特点提出分段计算背景均值形成门限检测雷电干扰。最后通过建立线性预测的全极点自回归模型来恢复雷电干扰所在位置上的杂波信号,达到干扰抑制的目的。实测数据处理结果表明了该文方法是有效的。

The faraway lightning impinging on the receivers of High-Frequency(HF) radar has to be rejected since it raises the Doppler spectrum background noise level and so degrades the detection performance of HF radar.According to the singularity of lightning interference,an approach which can discriminate lightning and clutter in fractal dimension by computing the direction-fractal dimension of radar echo signal is first proposed in this paper.Then a smart threshold avoiding the impulsive burst lightning is obtained and employed to detect the lightning.Finally a segment or segments of corrupted data are interpolated via linear prediction technique.The measured data are processed and the excellent performance of presented approach is demonstrated.

TN974