应用时频分析进行高频雷达射频干扰抑制

HF Radar Radio Frequency Interference Suppression Based on Time-Frequency Analysis

射频干扰是困扰高频雷达工作的难题之一 .本文基于雷达基带采样信号中射频干扰和有用目标信号的时频分布的差异 ,提出了一种新的射频干扰抑制方法 .将该方法应用于高频地波雷达的回波信号处理中 ,能有效地抑制射频干扰却不损失目标信号 ,从而使回波距离 多普勒谱的质量得到改善 ,大大提高了系统的抗干扰能力 .该方法也可视为自动实时选频系统的一种软实现 .

Radio frequency interference (RFI) often causes great trouble to HF radars. We propose a novel method for RFI suppression based on the discrepancies of the time-frequency distributions of the RFI and the target signals. The method suppresses RFI effectively while hardly brings any loss to the target signals so that the qualities of the echo range-Doppler spectra are greatly improved and the anti-jamming abilities of the HF radars are greatly enhanced. The method can also be regarded as a soft realization of the real time radar frequency selection.