OFDM-CPM-LFM雷达通信一体化信号研究

Research on integrated signal of OFDM-CPM-LFM radar communication

针对雷达通信一体化信号雷达、通信性能无法兼顾的问题,提出了OFDM-CPM-LFM雷达通信一体化信号.首先,通过连续相位调制(Continuous Phase Modulation,CPM)对线性调频信号(Linear Frequency Modulation,LFM)进行调制,降低信号模糊函数旁瓣提高雷达探测能力,在动态调制指数下均衡一体化信号性能;然后结合正交频分复用技术(Orthogonal Frequency Division Multiplexing,OFDM)提高通信传输速率,通过增加循环前、后缀降低干扰影响保证通信性能;最后,利用模糊函数与误码率分析一体化信号性能.仿真结果表明,所提一体化信号在保证雷达探测性能同时,能够实现高效通信,且误码率在信噪比10 dB时可达到10−5以下.

To address the problem that the radar and communication performance of radar communication integrated signal cannot be taken into account,OFDM-CPM-LFM radar communication integrated signal is proposed.Firstly,the linear frequency modulation(LFM)signal is modulated by continuous phase modulation(CPM)to reduce the signal side flap and improve the radar detection capability,and the integrated signal performance is balanced under the dynamic modulation index;then the orthogonal frequency division multiplexing(OFDM)technology is combined to improve the communication transmission rate,and the integrated signal performance is balanced by the dynamic modulation index.OFDM to improve the communication transmission rate,and reduce the influence of interference by increasing the cyclic prefix and suffix to ensure the communication performance;finally,the integrated signal performance is analyzed by using ambiguity function and bit error rate(BER).The simulation results show that the proposed integrated signal can achieve efficient communication while ensuring the radar detection performance,and the BER can reach below 10−5 at 10 dB SNR.