基于脉间频率步进信号的高频地波雷达回波信号处理

Processing of Step Frequency Signal in a High Frequency Ground Wave Over-the-Horizon Radar

针对高频地波雷达探测海面低速移动目标的要求 ,研究了脉间频率步进高频雷达接收系统的结构 ,给出了回波信号的采集方式 ,推导出了相应的数学解析式 ;分析了利用滑动时间窗方法和二次FFT算法提取目标信息的原理 ,给出了获得目标的距离谱和速度多普勒谱的方法 .模拟结果表明 ,该信号采集方式和处理方法能够保证系统要求的距离和速度分辨率 ,提高回波的信噪比 ,并能准确获得目标的距离和速度信息 .研究结果为脉间频率步进高频雷达的设计提供了依据 .

It is studied how to apply the step frequency signal in a high frequency ground wave over-the horizon radar.First, the receiver model of step frequency HF radar is analyzed, and its formulation is presented. Next, it is discussed how to obtain the range and velocity information of targets from the modulated frequency stepped radar signal through sliding time window method and two-dimension FFT algorithm. Finally, the simulation results manifest that the range and velocity information of targets can be extracted correctly using the processing methods proposed in this paper .