【摘要】：本文主要研究偽隨機(jī)碼寬帶擴(kuò)頻探測(cè)技術(shù)在海洋中的應(yīng)用,針對(duì)目前國內(nèi)外常用的典型水聲探測(cè)技術(shù)與設(shè)備的一些不足之處,提出利用偽隨機(jī)碼寬帶擴(kuò)頻技術(shù)改善現(xiàn)有的海洋探測(cè)系統(tǒng)性能。本文首先對(duì)擴(kuò)頻技術(shù)理論做了深入的討論,認(rèn)識(shí)到擴(kuò)頻技術(shù)對(duì)于信號(hào)信噪比的改善。偽隨機(jī)碼序列為偽隨機(jī)擴(kuò)頻系統(tǒng)的發(fā)射信號(hào),因而偽隨機(jī)碼的設(shè)計(jì)對(duì)系統(tǒng)性能具有重要的影響,此外,當(dāng)有多個(gè)系統(tǒng)平臺(tái)觀測(cè)時(shí),偽隨機(jī)碼還可作為碼分多址技術(shù)中的地址碼使用。本文的偽隨機(jī)碼以Gold序列為主,而Gold序列是基于m序列優(yōu)選對(duì)產(chǎn)生的,因而本文討論和探索了m序列和Gold序列的生成條件,并對(duì)其相關(guān)特性進(jìn)行比較,最終設(shè)計(jì)出適合擴(kuò)頻系統(tǒng)平臺(tái)的平衡Gold序列碼集。擴(kuò)頻技術(shù)中信號(hào)在接收端要達(dá)到最大信噪比,則需要一種最佳的線性濾波器,這就需要匹配濾波來實(shí)現(xiàn),因而本文還討論了匹配濾波的原理算法及其在時(shí)域和頻域的實(shí)現(xiàn),并在頻域上實(shí)現(xiàn)了Gold序列的匹配濾波處理。擴(kuò)頻技術(shù)的實(shí)現(xiàn)需要借助于數(shù)字信號(hào)處理器(DSP)平臺(tái),因而本研究利用數(shù)字信號(hào)處理器、模數(shù)/數(shù)模轉(zhuǎn)換器、內(nèi)存等硬件搭建了一海洋探測(cè)泛用的數(shù)字信號(hào)處理器平臺(tái),并將信號(hào)生成程序和匹配濾波程序?qū)懭朐撈脚_(tái)中,成為擴(kuò)頻技術(shù)的核心處理器。為驗(yàn)證偽隨機(jī)碼擴(kuò)頻技術(shù)對(duì)海洋探測(cè)系統(tǒng)性能的改善,在實(shí)驗(yàn)室環(huán)境下通過發(fā)射Gold序列、Chirp信號(hào)和CW信號(hào),并在接收端接收這些信號(hào),利用DSP中的匹配算法分別對(duì)其這三種信號(hào)進(jìn)行匹配處理,并評(píng)價(jià)這三種信號(hào)的匹配處理對(duì)系統(tǒng)性能的影響。結(jié)果表明6階的Gold序列具有和Chirp信號(hào)相近的系統(tǒng)處理增益,它們的增益比CW信號(hào)高得多,而Gold序列具有最佳的時(shí)間分辨率。此外,將數(shù)字信號(hào)處理器海洋泛用平臺(tái)運(yùn)用于海洋聲層析系統(tǒng)中,通過聲層析系統(tǒng)實(shí)現(xiàn)擴(kuò)頻技術(shù)在實(shí)際海洋探測(cè)中的應(yīng)用。計(jì)劃在舟山桃花島海域布設(shè)聲層析基站,選取目標(biāo)海域的聲層析布設(shè)點(diǎn),完成聲層析基站的設(shè)計(jì),并對(duì)目標(biāo)海域進(jìn)行水文調(diào)查并對(duì)該海域的聲學(xué)環(huán)境進(jìn)行分析,為實(shí)際海域系統(tǒng)測(cè)試和之后的長(zhǎng)期聲層析聲吶系統(tǒng)的觀測(cè)提供實(shí)際海域的聲學(xué)環(huán)境數(shù)據(jù)支撐。
文內(nèi)圖片：
圖片說明：階m序列自相關(guān)函數(shù)曲線
[Abstract]:In this paper, the application of pseudorandom code broadband spread spectrum detection technology in ocean is studied. In view of some shortcomings of typical underwater acoustic detection technology and equipment commonly used at home and abroad, the performance of existing marine detection system is improved by using pseudorandom code broadband spread spectrum technology. In this paper, the theory of spread spectrum technology is discussed in detail, and the improvement of signal-to-noise ratio (SNR) by spread spectrum technology is recognized. Pseudorandom code sequence is the transmitted signal of pseudorandom spread spectrum system, so the design of pseudorandom code has an important influence on system performance. In addition, pseudorandom code can also be used as address code in code division multiple access (CDMA) technology when there are multiple system platforms. In this paper, the pseudorandom code is mainly Gold sequence, while Gold sequence is based on m sequence optimization pair. Therefore, this paper discusses and explores the generation conditions of m sequence and Gold sequence, compares their related characteristics, and finally designs a balanced Gold sequence code set suitable for spread spectrum system platform. In order to achieve the maximum signal-to-noise ratio (SNR) at the receiver of spread spectrum technology, an optimal linear filter is needed, which requires matching filtering. Therefore, the principle and algorithm of matched filtering and its implementation in time domain and frequency domain are also discussed in this paper, and the matched filtering processing of Gold sequence is realized in frequency domain. The realization of spread spectrum technology needs the help of digital signal processor (DSP) platform, so this research uses digital signal processor, analog-to-digital converter, memory and other hardware to build a universal digital signal processor platform for ocean detection, and writes the signal generation program and matching filter program into the platform, which becomes the core processor of spread spectrum technology. In order to verify the improvement of the performance of marine detection system by pseudorandom code spread spectrum technology, Gold sequence, Chirp signal and CW signal are transmitted in laboratory environment, and these signals are received at the receiving end. The matching algorithm in DSP is used to match the three signals, and the influence of matching processing of these three signals on the performance of the system is evaluated. The results show that the sixth order Gold sequence has the same system processing gain as the Chirp signal, and their gain is much higher than that of the CW signal, while the Gold sequence has the best time resolution. In addition, the offshore universal platform of digital signal processor is applied to the ocean acoustic tomography system, and the application of spread spectrum technology in the actual ocean detection is realized by the acoustic tomography system. It is planned to set up acoustic chromatography base station in Zhoushan Taohua Island sea area, select the acoustic chromatography distribution point in the target sea area, complete the design of acoustic chromatography base station, and carry on the hydrological investigation to the target sea area and analyze the acoustic environment of the sea area, so as to provide the acoustic environment data support for the actual sea area system test and the long-term acoustic tomography Sonar system observation.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P715

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