混沌相位频率调制OFDM雷达信号研究

发布时间：2018-03-19 22:34

本文选题：OFDM雷达信号　切入点：模糊函数　出处：《信号处理》2017年09期 　论文类型：期刊论文

【摘要】：雷达波形设计逐渐成为现代雷达领域研究的热点,本文首先提出一种OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)混沌随机相位编码信号,并在此基础上用混沌序列对子载波进行频率调制,得到一种OFDM随机相位随机频率编码雷达信号形式,分析该信号的模糊函数、自相关特性以及子载波数对自相关性能的影响。同时,对该混沌编码信号存在的问题进行分析,并研究降低PMEPR(Peak to Mean Envelope Power Ratio,包络峰均比)的方法。仿真结果表明:基于混沌序列的OFDM相位频率组合调制信号具有更优的模糊函数和自相关旁瓣,混沌序列的复杂性和随机性使得信号具有更强的低截获特性。
[Abstract]:Radar waveform design has gradually become a hot topic in the field of modern radar. In this paper, a chaotic random phase coded signal named OFDM(Orthogonal Frequency Division Multiplexing (orthogonal Frequency Division Multiplexing) is proposed, and the frequency of subcarrier is modulated by chaotic sequence. A OFDM random phase random frequency coded radar signal form is obtained. The ambiguity function, autocorrelation characteristics and the influence of the number of subcarriers on the autocorrelation performance of the signal are analyzed. At the same time, the problems existing in the chaotic coded signal are analyzed. The method of reducing PMEPR(Peak to Mean Envelope Power ratio (PAPR) is studied. The simulation results show that the OFDM phase frequency combined modulation signal based on chaotic sequence has better ambiguity function and autocorrelation sidelobe. Because of the complexity and randomness of chaotic sequences, the signal has a stronger low interception characteristic.
【作者单位】：空军工程大学航空航天工程学院;北京航空航天大学电子信息工程学院;
【基金】：航空科学基金资助课题(2014ZC07002,20145596025)
【分类号】：TN957.51

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