【作者】 胡涛；

【导师】 赵春晖；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2007， 硕士

【摘要】 本文的内容主要是关于水下目标可视化仿真系统的技术研究，此系统为后续的水下目标的识别提供可靠的数据来源。常见的水下军事目标有水雷、鱼雷和潜艇等，本文主要对这几种典型的水下目标进行分析。由于水下环境的特殊性，声波是水下进行远程信息传播最有效的载体，因此目标的回声特性是进行可视化仿真的重要依据。本文基于水声学原理，根据目标在远场和近场的声散射特性的不同，采用不同的方法对目标的回声特性进行仿真。在远场条件下，利用亮点模型理论，结合“稳相法积分”，计算出水雷、鱼雷和潜艇的亮点参数，对它们的回波波形进行模拟，以提供一种从时域波形上进行水下目标识别的数据源。在近场条件下，运用修正的物理声学法近似求解水下目标的散射声场，采用面向对象的程序设计方法，在Visual C++平台下，具体实现了针对881A型的单波束声呐成像仿真和针对SeaBat8125型的多波束声呐成像仿真，并能对产生的图像进行加噪和保存。为了满足水下目标识别的多种数据需求，本文利用三维图形建模软件对水雷、鱼雷和潜艇进行精确建模，在OpenGL绘图环境下模拟水下摄像机的功能，实现了近距离的理想条件下的光学成像仿真。本文的仿真结果为水下目标的探测和识别系统作了有益的工作，并有助于水下目标识别新方法的研究。更多还原

【Abstract】 The main content of this thesis is the studies about the simulation system of underwater target visualization. This system will provide reliable data source for the underwater target recognition. In this thesis, the research is concentrated on the common underwater military object such as mine, torpedo and submarine.For the particularity of the underwater environment, the sound wave is the most effective media for long-distance propagation of underwater information. So the target echo characteristic is important evidence for visualization. Based on the acoustic theory and according to the different acoustic scattering feature between far field and near field, the target echo characteristic is simulated by different ways in this thesis.Under the condition of far field, the echo simulation of underwater target is implemented with their highlight parameters, which is calculated by making use of the highlight model theory and the method of "stabile phase integrate". It will present a kind of data source for the underwater target recognition from the wave of time domain.Under the condition of near field, the single-beam sonar imaging simulation based on 881A and the multibeam sonar imaging simulation based on SeaBat8125 are realized using modified physical acoustic method and object-oriented programming technique in the Visual C++ environment. Furthermore, the image as simulation result can be saved and added noise on it.For meeting the various data need of underwater target recognition, optical imaging simulation that imitate underwater camera under ideal situation, is carried out under the drawing environment of OpenGL with the models of mine, torpedo and submarine, which are set up in the 3D figure software.The simulation result of this thesis is helpful for underwater target detection and recognition, and useful for the study of new recognition method.更多还原