一种NLFM-CPM雷达通信一体化信号设计

Signal design for integrated radar and communication based on NLFM-CPM

针对利用雷达信号调制通信信息提高雷达低占空比脉冲发射形式下的通信速率时,信号自相关旁瓣较高的问题,提出一种基于非线性调频(nonlinear frequency modulation,NLFM)信号的雷达通信一体化信号形式。首先,结合连续相位调制(continuous phase modulation,CPM)建立了NLFM-CPM一体化信号模型。然后,根据雷达自相关性能准则与分辨性能准则,在匹配滤波的处理方案下,分析了一体化信号的调制参数对雷达探测性能的影响。最后,分析了调制参数对通信性能的影响。仿真结果表明,该信号在不损失雷达主瓣能量、距离与速度分辨率以及兼顾通信可靠性的前提下,可实现低于-35dB的自相关旁瓣。

Aiming at high autocorrelation sidelobe existing in using radar signal modulated by communication information to improve communication data rate of radar under low duty cycle pulse transmission,an integrated radar and communication signal format based on nonlinear frequency modulation(NLFM)signal is proposed.At first,by combining the continuous phase modulation(CPM)and the NLFM signal,the model of the NLFM-CPM integrated signal is established.Then,based on the radar autocorrelation performance criterion and the resolution criterion,with the matched filter approach,the impact of the modulation parameters of the integrated signal on radar detection performance is analyzed.Finally,the impact of modulation parameters on communication performance is analyzed.The simulation results show that under the premise of not losing the radar mainlobe energy,range resolution,velocity resolution and maintaining the reliability of communication,the proposed signal can make the autocorrelation sidelobe less than-35dB.