發(fā)布時(shí)間：2018-08-04 09:39

【摘要】：近幾年來(lái),雷達(dá)成為目標(biāo)偵察與探測(cè)、跟蹤與制導(dǎo)的重要工具,受到國(guó)防軍事需求的牽引以及科學(xué)技術(shù)進(jìn)步的驅(qū)動(dòng),發(fā)展速度極其迅猛,新體制雷達(dá)種類(lèi)層出不窮。雷達(dá)研究領(lǐng)域中抗干擾性能和距離高分辨一直是雷達(dá)研究者密切關(guān)注的焦點(diǎn)問(wèn)題。本文提出的一種新體制雷達(dá)混沌編碼OFDM信號(hào)可以保證具有良好的抗干擾性能與較高的距離分辨力�；煦缇幋aOFDM信號(hào)是將混沌序列以相位編碼的形式編入到正交頻分復(fù)用信號(hào)之中�；煦缧蛄惺且环N看似無(wú)序其實(shí)有序的一組確定映射關(guān)系,擁有較好的自相關(guān)性并且難以被敵方接受機(jī)所截獲與破解,而正交頻分復(fù)用信號(hào),即OFDM信號(hào),則是一種多載頻信號(hào),每個(gè)載頻都滿足正交關(guān)系,OFDM信號(hào)有較大的合成帶寬,還擁有較高的頻譜利用率。所以將混沌與OFDM加以結(jié)合,設(shè)計(jì)出一種難以截獲破解且合成帶寬大的混沌編碼OFDM信號(hào)。本文可以分為三個(gè)部分:分別為混沌編碼OFDM信號(hào)的設(shè)計(jì)及混沌編碼OFDM信號(hào)的處理與分析。在第一部分中,主要介紹了混沌理論和OFDM信號(hào)的基本原理,并給出了混沌編碼OFDM雷達(dá)信號(hào)形式。針對(duì)此類(lèi)信號(hào)的相關(guān)性,模糊函數(shù)和包絡(luò)峰的基本概念加以闡述與推論,提出了改善包絡(luò)峰均比的方法,最后分析并設(shè)定了此類(lèi)信號(hào)的參數(shù)。在第二部分中,主要介紹了混沌編碼OFDM信號(hào)的回波處理過(guò)程,討論了信號(hào)的低截獲概率特性,并對(duì)此信號(hào)的抗壓制干擾性能進(jìn)行了分析與仿真驗(yàn)證。最后介紹了基于空時(shí)自適應(yīng)處理(STAP)的混沌編碼OFDM信號(hào)的雜波抑制性能分析。在第三部分中,主要闡述了本文的不足之處,并對(duì)后續(xù)工作方向提出建議。
[Abstract]:In recent years, radar has become an important tool for target reconnaissance and detection, tracking and guidance, driven by the military requirements of national defense and the progress of science and technology. Anti-jamming performance and high range resolution in radar research field have been the focus of radar researchers. In this paper, a new radar chaotic coded OFDM signal is proposed, which can guarantee good anti-jamming performance and high range resolution. Chaotic coded OFDM signals are coded in the form of phase coding to orthogonal frequency division multiplexing (OFDM) signals. Chaotic sequences are a set of deterministic mapping relationships which appear to be in an ordered order, which have good autocorrelation and are difficult to be intercepted and deciphered by enemy aircraft. The orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal, while the orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal. Each carrier frequency satisfies the orthogonal relation OFDM signal has the big synthesis bandwidth, also has the high spectrum efficiency. So a chaotic coded OFDM signal which is difficult to intercept and has large synthesis bandwidth is designed by combining chaos with OFDM. This paper can be divided into three parts: the design of chaotic coded OFDM signal and the processing and analysis of chaotic coded OFDM signal. In the first part, the chaos theory and the basic principle of OFDM signal are introduced, and the chaotic coded OFDM radar signal form is given. Aiming at the correlation of this kind of signal, the basic concepts of fuzzy function and envelope peak are expounded and inferred, and a method to improve the envelope peak to average ratio is put forward. Finally, the parameters of this kind of signal are analyzed and set. In the second part, the echo processing process of chaotic coded OFDM signal is introduced, and the characteristics of low probability of interception are discussed, and the anti-suppression interference performance of the signal is analyzed and verified by simulation. Finally, the clutter suppression performance of chaotic coded OFDM signal based on space-time adaptive processing (STAP) is introduced. In the third part, the deficiency of this paper is discussed, and some suggestions on the future work are put forward.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN957.51

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本文編號(hào)：2163441