一种基于OCDM 的新型雷达通信一体化系统

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。

A New Radar-Communication Integrated System Based on OCDM

In order to increase the spectrum efficiency and system integration level, joint radar-communication (Rad- Com) 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 RadCom 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.