基于参量阵的水声通信技术研究

发布时间：2018-04-10 10:47

本文选题：水声通信　+ 参量阵　；参考：《哈尔滨工程大学》2014年硕士论文

【摘要】：水声通信技术是水声领域的重点研究内容之一,本文主要通过实验研究了基于参量阵的水声通信技术。这种技术可以使用一个相对尺寸较小的发射换能器来产生一个具有良好指向性的低频声波,它可以解决水下远程通信中换能器尺寸偏大的问题。参量阵是水的非线性作用的结果,本文介绍了参量阵的产生原理,同时也对非线性波动方程和伯克泰远场解进行了推导。为了验证参量阵这一理论的存在,在水槽中测量了差频波在水下各个位置处的声压值。实验表明差频波确实存在,并且通过实验结果,对参量阵的特点有了大体的了解。参量阵具有十分显著的特点,本文对参量阵的指向性与差频波的能量转换效率两方面进行研究。为了测得参量阵的指向性,首先进行理论分析、推导参量阵指向性函数,并进行数值仿真,接着进行水池实验,得到确切的数值与仿真结果进行比较,最后对参量阵具有高指向性这一特点的原因进行分析。在研究参量阵能量转换效率时,首先对水槽实验结果进行分析,讨论差频波在换能器的中心轴线上能量变化规律,接着推导能量转换效率公式,分析各种因素对它的影响,指出提高转换效率的方法。本文的主要内容是基于参量阵的水声通信实验。首先进行理论仿真,确定实验中选用的数据调制和解调方法,最终调制方法选用可靠性更高的二进制频移键控法,解调方法选择抗干扰效果更好的相干解调法。确定调制与解调方法后,进行水池中的参量阵数据通信实验,在对水听器接收到的声波进行解调后,得到与所发数据相同的结果,证明利用参量阵进行水下数据的通信是可行的,也就是说可以应用参量阵技术,令一个相对尺寸较小的换能器产生高指向性的低频波并进行水声通信。
[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.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.3

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