线性调频和巴克码组合调制雷达信号

Hybrid Radar Signal Composed Modulation of Linear Frequency and Barker Phase Coded Modulation

针对雷达在现代电子战争中采用单一的线性调频或单一的相位编码信号容易被敌方电子侦察设备截获的问题,提出一种脉内线性调频、脉间13位巴克码相位编码的组合调制信号形式。通过理论分析和计算机仿真,给出信号的模糊图、距离分辨力、速度分辨力以及低截获概率(LPI,Low Probability of Intercept)特性分析,结果表明该信号波形具有近似"图钉"型的模糊图和良好的距离及速度分辨力。最后进行了LPI性能分析,表明该信号形式降低了截获概率因子,提升了雷达的LPI性能。

For the problem that the simplex modulated radar signal using linear frequency modulation（LFM） or phase code modulation can be easily intercepted by electronic reconnaissance equipment in modern electronic war,a hybrid radar signal composed of LFM and 13 bit Barker phase coded signal is proposed.By the theoretical analysis and computer simulation,several characteristics of radar signal have been discussed,such as ambiguity graph,distance resolution,velocity resolution and low probability of intercept（LPI） performance.The simulations show that the hybrid signal has a ＂thumbtack＂ ambiguity graph and a better performance for the distance resolution and the velocity resolution.Finally,LPI performance analysis proves that the intercept factor is reduced and the LPI performance is improved.