多符号OFDM雷达通信一体化波形优化设计方法

Waveform Optimization Design for Integration of Radar and Communication Based on Multi-symbol OFDM

雷达通信一体化有利于提高设备硬件资源利用率和频谱利用率,改善频谱拥挤现象,成为近年来研究的热点。针对直接信息调制一体化信号旁瓣较高、扩频信息调制一体化信号带宽较大的缺点,提出了一种加权预处理一体化波形优化方法。分析了多符号正交频分复用雷达通信一体化信号的模糊函数及其相关函数对模糊函数的影响,利用鲸鱼优化算法选择加权系数来改善原始序列的自相关和互相关特性,进而优化模糊函数的峰值旁瓣比性能。仿真结果表明,所提的一体化波形设计方法带宽更小,同时峰值旁瓣比性能进一步得到优化,通信速率和误比特率性能满足通信需求,具有较好的雷达通信一体化性能。

The integration of radar and communication is conducive to improving the utilization rate of hardware resources and spectrum,and alleviating the phenomenon of spectrum congestion,which has become a research hotspot in recent years.The integrated signal modulated by direct information has high side lobe,and the integrated signal modulated by spread spectrum has large bandwidth.To solve the problems,an integrated waveform optimization method with weighted preprocessing is proposed.This paper analyzes the ambiguity function of multi-symbol Orthogonal Frequency Division Multiplexing integrated signal and the effect of correlation function on the ambiguity function,and utilizes the Whale Optimization Algorithm to select the weighting coefficients to improve the auto-correlation and cross-correlation performance of the original sequence,and then optimizes the peak sidelobe ratio performance of the ambiguity function.Simulation results show that: 1) The proposed integrated waveform design method has a smaller bandwidth and the peak sidelobe ratio performance is further optimized;and 2) The communication rate and bit error rate performance satisfy the communication requirements,which makes it suitable for the integration of radar and communication.