一种基于OCDM的新型雷达通信一体化系统

A New Radar-Communication Integrated System Based on OCDM

为提高频谱利用率并实现系统小型化、集成化,近年来雷达通信一体化系统成为重要研究方向。正交线性调频波分复用(OCDM)信号是利用菲涅尔变换形成的一组正交线性啁啾(chirp)信号,基于OCDM的雷达通信一体化信号不仅具有正交频分复用(OFDM)信号的频谱利用率高、适合高速数据传输等优点,且具有更好的抗多径干扰能力,被认为是较好的OFDM一体化信号替代方案。文中提出了一种新型OCDM雷达信号处理方法,有效去除随机通信数据的同时,大幅降低计算复杂度。基于此方法,进一步构建了新型OCDM雷达通信一体化系统,分析比较了多径信道下,OCDM系统与OFDM系统的通信性能,并仿真比较了OFDM系统、传统OCDM系统以及新型OCDM系统的雷达性能。结果表明,新型OCDM一体化系统的通信性能优于OFDM系统,在大幅度降低传统OCDM系统的雷达信号处理算法计算复杂度的同时,具有更好的雷达探测性能,整体方案具有良好的工程应用前景。

In order to increase the spectrum efficiency and system integration level,joint radar-communication(RadCom)systems have been proposed and received great attention from the research community.The Orthogonal Chirp Division Multiplexing(OCDM)signal,which is the combination of a group of orthogonal chirp signals and can be implemented using discrete Fresnel transform(DFnT),is considered as a promising alternative of OFDM signal in Rad-Com system for its advantages of high spectrum efficiency,high communication rate,and anti-multipath jamming.In this paper,a novel OCDM radar signal processing method,which can eliminate the random communication data with lower computational complexity,has been proposed.Furthermore,a new Rad Com system based on OCDM has been built and communication and radar detection performances have been evaluated.Simulation results illustrate the superiority of our proposed system.