本文選題：OFDM雷達(dá)信號(hào)　切入點(diǎn)：模糊函數(shù)　出處：《信號(hào)處理》2017年09期 　論文類型：期刊論文

【摘要】：雷達(dá)波形設(shè)計(jì)逐漸成為現(xiàn)代雷達(dá)領(lǐng)域研究的熱點(diǎn),本文首先提出一種OFDM(Orthogonal Frequency Division Multiplexing,正交頻分復(fù)用)混沌隨機(jī)相位編碼信號(hào),并在此基礎(chǔ)上用混沌序列對(duì)子載波進(jìn)行頻率調(diào)制,得到一種OFDM隨機(jī)相位隨機(jī)頻率編碼雷達(dá)信號(hào)形式,分析該信號(hào)的模糊函數(shù)、自相關(guān)特性以及子載波數(shù)對(duì)自相關(guān)性能的影響。同時(shí),對(duì)該混沌編碼信號(hào)存在的問題進(jìn)行分析,并研究降低PMEPR(Peak to Mean Envelope Power Ratio,包絡(luò)峰均比)的方法。仿真結(jié)果表明:基于混沌序列的OFDM相位頻率組合調(diào)制信號(hào)具有更優(yōu)的模糊函數(shù)和自相關(guān)旁瓣,混沌序列的復(fù)雜性和隨機(jī)性使得信號(hào)具有更強(qiáng)的低截獲特性。
[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.
【作者單位】： 空軍工程大學(xué)航空航天工程學(xué)院;北京航空航天大學(xué)電子信息工程學(xué)院;
【基金】：航空科學(xué)基金資助課題(2014ZC07002,20145596025)
【分類號(hào)】：TN957.51

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本文編號(hào)：1636293