一种频谱随机非连续雷达信号的处理方法

A Processing Method for Random Spectrum Discontinuous Radar Signal

高频地波OTH雷达工作在电磁干扰严重的短波波段 ,采用非连续频谱信号可降低电磁干扰对雷达的影响 ,但频谱的非连续性会引起距离旁瓣的升高 ,回波信号的动态范围变小 ,这种旁瓣无法用传统频域加权方法消除 ,从而导致地波雷达在多目标环境下探测弱小目标的能力降低。文中从消除信号频谱的非连续性的角度 ,介绍了一种基于线性预测方法的频谱非连续高频雷达信号的处理方法 ,较好地实现了频域不连续信号距离速度二维处理。经过预测处理后所得到的输出波形的距离旁瓣电平达到 -2 7dB ,目标的距离旁瓣得到有效抑制 ,使雷达在多目标环境下检测弱小目标的能力大大提高。

HF-OTH radars operate in the short-wave band w here there are many heavy electromagnetic inferences. Use of discontinuous spect rum waveform can mitigate the interferences to radars, but it gives rise to hi gh range sidelobes and thus a low signal dynamic range. This kind of sidelobes c an not be suppressed by traditional spectral weighting, and the radar performanc e of detecting the weak targets in multi-target environment is decreased. In th is paper we introduced a new signal processing technique based on linear predica tion to eliminate the discontinuity of discontinuous spectrum HF radar signal. Simulation results show that the range sidelobes can be reduced to-27dB after pr ocessed by the new technique, and the capability of radar to detect weak target s in multi-target environment is significantly improved.