非连续谱FMCW雷达信号分析与处理

Signal analysis and processing for discontinuous spectra FMCW radar

高频地波雷达工作在干扰严重的高频段,系统很难找到一段连续寂净的工作频段。为提高雷达抗干扰性能,用几个不连续的干净频带来合成系统的有效带宽。分析了一种非连续谱线性调频雷达信号;根据信号特点采用先速度后距离的二维处理方式;通过对每段信号进行分解、相位补偿、重构的方法来消除由频率跳变所引起的距离旁瓣增高,谱峰分裂、偏移等影响。仿真结果表明了该方法能有效地抑制旁瓣,实现目标的二维分辨。

High frequency ground wave radars （GWR） operate in HF band, which is a hostile electromagnetic environment, making it difficult to find a broad clear frequency band for signal transmission. In order to improve the performance of radar for anti-jamming, the system band is synthesized of several discontinuous clear frequency bands. This paper analyzes a FMCW radar signal with discontinuous spectra, and proposes a velocity-range processing method. To eliminate the influence of frequency hopping, the methods of signal decomposition, phase compensation and signal reconstruction are applied to each segment. The simulation results show that the method can suppress the range sidelobes efficiently, and realize the range-Doppler resolution successfully.