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高频声纳接收信号仿真预报

Simulation and Forecast of High-frequency Sonar Receiving Signal

作者: 专业:声学 导师:朴胜春 年度:2010 学位:硕士  院校: 哈尔滨工程大学

Keywords

Receiving signal, GRAB, Reverberation

        高频声纳接收信号仿真预报研究在声纳研制的不同阶段都具有很重要的意义。本文所仿真的高频声纳接收信号包括有以下几类信号:1、单程传输信号,即高频声纳声源发射的声信号经过信道单程传输,在接收水听器处的声信号,这种传输方式多用于水下通讯、定位,导航等。2、水中目标回波信号,即高频声纳声源发射信号打到水下目标如潜艇、鱼雷等时经由目标散射返回到接收水听器处的声信号。这种工作方式用于目标的探测和识别。3、海底混响信号,即高频声纳工作过程中,部分声信号经由海底散射后到达接收水听器的信号。4、海底回波信号,即高频声纳发射信号打到海底经由海底散射返回到接收水听器的接收信号。这种信号可用于仿真测深仪、侧扫声纳等的接收信号。在这四种接收信号的仿真建模中,传播模型是很重要的一个部分。针对射线声学计算简单适用于高频情况这一特点,本文选取高斯射线束(GRAB)声线传播理论进行传播建模,它是由射线理论演变而来,但克服了其不能计算声影区和焦散区声场的缺点,在一定距离上每一根声线对所有深度都有能量贡献。最后本文以Visual C++为平台编写了人机交互界面,通过在界面输入操作指令实现对用户指定海洋环境情况下的高频声纳接收信号进行预报的功能。本软件利用动态链接库实现了VC对Fortran计算程序的调用,并采用Matcom接口实现了VC与Matlab的混合编程,完成了伪彩图形的显示功能。
    The simulation and forecast about receiving signal of high-frequency sonar plays a very important role in different stages of sonar design. As follows, this paper completes four kinds of receiving signals:1. One-way propagation signal: high-frequency sonar emits signal, which transmits single path and received by hydrophone. This kind of transmission is always applied in underwater communication, location, guidance.2. Echo signal of underwater target: high-frequency sonar emits signal on target, such as submarine, torpedo, then the backscattered signal from target transmits to hydrophone. This type of transmission is usually used in detecting and identifying.3. Reverberation of sea bottom: parts of the signal from sound generator are backscattered by sea bottom, which is received by hydrophone as reverberation.4. Echo signal of sea bottom: high-frequency sonar emits signal on sea bottom, then the backscatter signal transmits to hydrophone. This kind of signal is adapted to simulate the signal of bathymeter and side-scanning sonar.In the simulation of four kinds of receiving signals, transmission model is an important part. This paper adopts Gaussian Ray Bundle (GRAB) theory as the modeling method, because that the ray theory is fit for high-frequency. GRAB is a ray-based model, which overcomes the disadvantages of traditional ray theory. In a certain range, every single ray has contribution for any depth.Finally using Visual C++ as platform, this paper programs the man-machine interface, which can display receiving signal wave through the setting of specified marine conditions. It also uses DLL to realize calling Fortran programs, and realize the function of displaying colorful graphic by mixing programming between VC and Matlab.
        

高频声纳接收信号仿真预报

摘要5-6
ABSTRACT6
第1章 绪论9-13
    1.1 课题背景和意义9-10
    1.2 高频声纳仿真研究概况10-11
    1.3 本文的主要内容11-13
第2章 传播模型13-23
    2.1 射线声学基础13-15
    2.2 GRAB 的基本理论15-19
        2.2.1 GRAB 的基本方程15-18
        2.2.2 GRAB 算法程序18-19
    2.3 时域波形预报模型19-22
    2.4 本章小结22-23
第3章 高频声纳接收信号模型23-38
    3.1 高频声纳单程传输信号23-26
    3.2 高频声纳水中目标回波信号26-29
    3.3 高频声纳海底混响信号29-35
        3.3.1 简化理论推导的几点假设29
        3.3.2 模型的建立29-30
        3.3.3 混响时域波形的推导30-35
    3.4 高频声纳海底回波信号35-37
    3.5 本章小结37-38
第4章 软件与仿真38-59
    4.1 仿真平台特点38-41
        4.1.1 C++特点38-39
        4.1.2 动态链接库调用39-40
        4.1.3 基于MATCOM 的VC 与MATLAB 混合编程40-41
    4.2 人机交互界面41-46
    4.3 仿真结果检验46-58
        4.3.1 单程传输信号46-49
        4.3.2 水中目标回波信号49-51
        4.3.3 海底混响信号51-56
        4.3.4 海底回波信号56-58
    4.4 本章小结58-59
结论59-60
参考文献60-63
致谢63
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