發(fā)布時(shí)間：2018-04-10 10:47

本文選題：水聲通信　+ 參量陣　；參考：《哈爾濱工程大學(xué)》2014年碩士論文

【摘要】：水聲通信技術(shù)是水聲領(lǐng)域的重點(diǎn)研究?jī)?nèi)容之一,本文主要通過(guò)實(shí)驗(yàn)研究了基于參量陣的水聲通信技術(shù)。這種技術(shù)可以使用一個(gè)相對(duì)尺寸較小的發(fā)射換能器來(lái)產(chǎn)生一個(gè)具有良好指向性的低頻聲波,它可以解決水下遠(yuǎn)程通信中換能器尺寸偏大的問(wèn)題。參量陣是水的非線性作用的結(jié)果,本文介紹了參量陣的產(chǎn)生原理,同時(shí)也對(duì)非線性波動(dòng)方程和伯克泰遠(yuǎn)場(chǎng)解進(jìn)行了推導(dǎo)。為了驗(yàn)證參量陣這一理論的存在,在水槽中測(cè)量了差頻波在水下各個(gè)位置處的聲壓值。實(shí)驗(yàn)表明差頻波確實(shí)存在,并且通過(guò)實(shí)驗(yàn)結(jié)果,對(duì)參量陣的特點(diǎn)有了大體的了解。參量陣具有十分顯著的特點(diǎn),本文對(duì)參量陣的指向性與差頻波的能量轉(zhuǎn)換效率兩方面進(jìn)行研究。為了測(cè)得參量陣的指向性,首先進(jìn)行理論分析、推導(dǎo)參量陣指向性函數(shù),并進(jìn)行數(shù)值仿真,接著進(jìn)行水池實(shí)驗(yàn),得到確切的數(shù)值與仿真結(jié)果進(jìn)行比較,最后對(duì)參量陣具有高指向性這一特點(diǎn)的原因進(jìn)行分析。在研究參量陣能量轉(zhuǎn)換效率時(shí),首先對(duì)水槽實(shí)驗(yàn)結(jié)果進(jìn)行分析,討論差頻波在換能器的中心軸線上能量變化規(guī)律,接著推導(dǎo)能量轉(zhuǎn)換效率公式,分析各種因素對(duì)它的影響,指出提高轉(zhuǎn)換效率的方法。本文的主要內(nèi)容是基于參量陣的水聲通信實(shí)驗(yàn)。首先進(jìn)行理論仿真,確定實(shí)驗(yàn)中選用的數(shù)據(jù)調(diào)制和解調(diào)方法,最終調(diào)制方法選用可靠性更高的二進(jìn)制頻移鍵控法,解調(diào)方法選擇抗干擾效果更好的相干解調(diào)法。確定調(diào)制與解調(diào)方法后,進(jìn)行水池中的參量陣數(shù)據(jù)通信實(shí)驗(yàn),在對(duì)水聽(tīng)器接收到的聲波進(jìn)行解調(diào)后,得到與所發(fā)數(shù)據(jù)相同的結(jié)果,證明利用參量陣進(jìn)行水下數(shù)據(jù)的通信是可行的,也就是說(shuō)可以應(yīng)用參量陣技術(shù),令一個(gè)相對(duì)尺寸較小的換能器產(chǎn)生高指向性的低頻波并進(jìn)行水聲通信。
[Abstract]:Underwater acoustic communication technology is one of the key research contents in underwater acoustic field. This paper mainly studies the underwater acoustic communication technology based on parametric array through experiments.This technique can use a relatively small transmitting transducer to produce a low frequency acoustic wave with good directivity. It can solve the problem of large transducer size in underwater remote communication.The parametric matrix is the result of the nonlinear action of water. In this paper, the principle of the parametric matrix is introduced, and the nonlinear wave equation and the Berkshire far-field solution are also derived.In order to verify the existence of the theory of parametric array, the acoustic pressure of the differential frequency wave at various locations under water was measured in the flume.The experimental results show that the differential frequency waves do exist, and the characteristics of the parametric arrays are generally understood by the experimental results.Parametric arrays have very remarkable characteristics. In this paper, the directivity of parametric arrays and the energy conversion efficiency of differential frequency waves are studied.In order to measure the directivity of the parametric array, the theoretical analysis is carried out, the directivity function of the parametric array is deduced, and the numerical simulation is carried out, and the exact numerical value is compared with the simulation result.Finally, the reason of the high directivity of parametric array is analyzed.In studying the energy conversion efficiency of parametric array, the experimental results of flume are analyzed firstly, and the law of energy variation of differential frequency wave on the central axis of transducer is discussed. Then, the formula of energy conversion efficiency is deduced, and the influence of various factors on it is analyzed.The method of improving conversion efficiency is pointed out.The main content of this paper is the experiment of underwater acoustic communication based on parametric array.Firstly, the theoretical simulation is carried out to determine the data modulation and demodulation method selected in the experiment, and the binary frequency shift keying method with higher reliability is used in the final modulation method, and the coherent demodulation method with better anti-interference effect is chosen as the demodulation method.After the method of modulation and demodulation is determined, the experiment of parametric array data communication in the pool is carried out. After demodulating the sound wave received by the hydrophone, the same results as the data are obtained.It is proved that it is feasible to use parametric array to communicate underwater data, that is to say, parametric array technology can be used to make a transducer with relatively small size produce low frequency wave with high directivity and carry out underwater acoustic communication.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.3

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本文編號(hào)：1730879