本文關(guān)鍵詞： 相位編碼OFDM 波形設(shè)計 信號處理 抗干擾 仿真軟件實(shí)現(xiàn)　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：新體制抗干擾雷達(dá)和高分辨率雷達(dá)成像技術(shù)是近幾年來雷達(dá)領(lǐng)域研究的熱點(diǎn),而相位編碼OFDM雷達(dá)同時具有較高的距離分辨率和優(yōu)良的抗干擾性能,因此研究相位編碼OFDM雷達(dá)關(guān)鍵技術(shù)的仿真實(shí)現(xiàn)并進(jìn)一步構(gòu)建其可視化的仿真軟件系統(tǒng)具有一定的實(shí)用價值。相位編碼OFDM信號,顧名思義,是指對OFDM信號的各個子載波進(jìn)行合適的相位編碼,因此其信號的產(chǎn)生可以和普通OFDM信號一樣直接利用IFFT/FFT進(jìn)行快速的數(shù)字調(diào)制解調(diào)。相位編碼OFDM信號具有較大的時寬帶寬積,因此雷達(dá)可以獲得較好的低截獲概率性能和較高的距離分辨力。多樣的相位編碼方式又使得相位編碼OFDM雷達(dá)的波形設(shè)計靈活多變,通過適當(dāng)?shù)牟ㄐ卧O(shè)計和優(yōu)化使得雷達(dá)可獲得較高的抗干擾性能,因而能夠更好地適應(yīng)復(fù)雜的工作環(huán)境。本文可分為兩個部分,其中第一部分是對相位編碼OFDM雷達(dá)系統(tǒng)的仿真實(shí)現(xiàn)的關(guān)鍵算法進(jìn)行研究和驗(yàn)證,主要包括以下三個方面的內(nèi)容：在波形設(shè)計方面,首先,本文對相位編碼OFDM信號的結(jié)構(gòu)特性、模糊特性和自相關(guān)特性進(jìn)行了詳細(xì)的分析；然后,分別在巴克碼和混沌二相碼兩種不同的編碼方式下,研究了改善信號的自相關(guān)性能和峰均功率比的方法；最后,給出一種可行的相位編碼OFDM雷達(dá)發(fā)射信號的設(shè)計方式。在信號處理方面,首先,本文闡述了相位編碼OFDM雷達(dá)系統(tǒng)的信號發(fā)射和回波接收過程；然后,針對OFDM信號特殊結(jié)構(gòu)研究了“兩級脈沖壓縮”方法和相應(yīng)的目標(biāo)檢測方法。最后,對于目標(biāo)測距和測速問題,分別采用降低模糊函數(shù)周期旁瓣來避免距離模糊的方法和基于“最小二乘”解速度模糊的測速方法。在抗干擾性能方面,本文主要研究的是混沌編碼OFDM雷達(dá)信號。利用混沌碼的初值敏感性產(chǎn)生眾多彼此互不相關(guān)的編碼序列,而雷達(dá)發(fā)射信號的不同脈沖由不同初值的混沌二相碼序列所編碼,由此增加了脈沖問的互異性,從而提高了混沌編碼OFDM雷達(dá)在噪聲壓制干擾和復(fù)制欺騙干擾下的抗十?dāng)_性能。第二部分主要介紹了在VC++平臺上,相位編碼OFDM雷達(dá)系統(tǒng)仿真軟件的模塊化方式的設(shè)計與實(shí)現(xiàn)。首先,利用已在第一部分完成研究的相位編碼OFDM雷達(dá)系統(tǒng)的各級實(shí)現(xiàn)算法,進(jìn)行了仿真軟件的各級功能模塊的設(shè)計和實(shí)現(xiàn)。然后,完成了對各個主要模塊的仿真調(diào)試及對整個仿真內(nèi)核的系統(tǒng)仿真調(diào)試。
[Abstract]:The new anti-jamming radar and high-resolution radar imaging technology are the hot spots in the field of radar in recent years, while the phase-coded OFDM radar has high range resolution and excellent anti-jamming performance at the same time. Therefore, it has certain practical value to study the simulation of the key technology of phase-coded OFDM radar and further construct its visual simulation software system. The phase-coded OFDM signal, as its name implies, It refers to the proper phase coding of each sub-carrier of OFDM signal, so its signal can be generated by using IFFT/FFT directly as ordinary OFDM signal to perform fast digital modulation and demodulation. The phase-coded OFDM signal has a large time-bandwidth wide product. Therefore, radar can obtain better performance of low probability of interception and higher range resolution. Various phase coding methods make the waveform design of phase-coded OFDM radar flexible and changeable. Through proper waveform design and optimization, radar can achieve high anti-jamming performance, so it can better adapt to complex working environment. This paper can be divided into two parts. The first part is to study and verify the key algorithms of phase coded OFDM radar system simulation, including the following three aspects: in the aspect of waveform design, firstly, the structural characteristics of phase coded OFDM signal are discussed. The fuzzy and autocorrelation characteristics are analyzed in detail. Then, the methods to improve the autocorrelation performance and the peak-to-average power ratio of the signal are studied under two different coding methods: Barker code and chaotic two-phase code. In the aspect of signal processing, this paper first describes the signal transmitting and echo receiving process of phase coded OFDM radar system. According to the special structure of OFDM signal, the "two-stage pulse compression" method and the corresponding target detection method are studied. The method of reducing the periodic sidelobes of fuzzy function to avoid distance ambiguity and the method of velocity measurement based on least square solution are adopted respectively. In this paper, chaotic coded OFDM radar signals are mainly studied. Using the initial value sensitivity of chaotic codes to generate many discrete coding sequences, the different pulses of radar transmitted signals are encoded by chaotic binary code sequences with different initial values. In this way, the mutual heterogeneity of pulse interferences is increased, and the performance of chaotic coded OFDM radar is improved under noise suppression jamming and duplicated deception jamming. The second part mainly introduces the performance of chaotic coded OFDM radar on VC platform. The design and implementation of modularization of phase coded OFDM radar system simulation software. Firstly, the realization algorithm of phase coded OFDM radar system has been completed in the first part. The design and implementation of the functional modules at all levels of the simulation software are carried out. Then, the simulation debugging of the main modules and the system simulation debugging of the whole simulation kernel are completed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN958

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