CDS-OFDM雷达通信一体化波形设计
首发时间:2019-04-29
摘要:由于多载波波形已在通信中得到了广泛应用,在雷达中也表现出良好的性能,采用正交频分复用(OFDM)信号实现雷达通信一体化可以同时满足通信系统信息传输和雷达探测的功能。研究发现,通信调制信息会影响雷达通信一体化波形的模糊函数,因此本文设计了一种基于混沌序列直接扩频(C-DSSS)的OFDM雷达通信一体化信号(CDS-OFDM),通过对通信信息进行预扩频的方式,改善一体化信号的模糊函数性能。采用相关性良好的混沌序列作为伪随机扩频码进行直接扩频,从而提高一体化信号的自相关性,有效的降低模糊函数的旁瓣,从而增强对目标的检测能力。本文对一体化信号的宽带模糊函数进行了详细分析,对发送和接收端的实现进行了详细说明。理论分析和仿真结果表明,本文设计的一体化波形能够满足常规雷达检测的要求,并具有良好的通信性能。
关键词: 雷达通信一体化 OFDM DSSS 混沌序列 模糊函数
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Integrated Waveform Design of OFDM Radar Communication Based on Direct Sequence Spread Spectrum
Abstract:Because the multi-carrier wave form has been widely used in the communication, it also shows good performance in the radar, and the orthogonal frequency division multiplexing (OFDM) signal is adopted to realize the radar communication integration, and the function of the communication system information transmission and the radar detection can be met at the same time. It is found that the communication modulation information will affect the fuzzy function of radar communication integrated waveform. Therefore, an OFDM radar communication integrated signal (CDS-OFDM) based on chaotic sequence direct spread spectrum (C-DSSS) is designed in this paper. The ambiguity function performance of the integrated signal is improved by pre-spreading the communication information. The ambiguity function performance of the integrated signal is improved. The chaotic sequence with good correlation is used as the pseudo-random spread spectrum code to improve the autocorrelation of the communication data information, so as to improve the autocorrelation of the integrated signal, effectively reduce the sidelobe of the ambiguity function, and thus enhance the detection ability of the target. In this paper, the wideband ambiguity function of the integrated signal is analyzed in detail, and the implementation of the sending and receiving end is described in detail. The theoretical analysis and simulation results show that the integrated waveform designed in this paper can meet the requirements of conventional radar detection and has good communication performance.
Keywords: Radar Communication Integration OFDM DSSS Chaotic sequence Ambiguity function
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