A pvdf piezoelectric membrane is used as sensitive element for measuring the scalar pressure of the underwater sound field 而声压通道采用pvdf压电薄膜作为敏感元件，以拾取水下声场中的标量信息。
In traveling through the sea , an underwater sound signal is affected by many factors and takes much information of the ocean 水声信号在海洋中传播时受到各种海洋环境因素的影响，携带了大量的海洋环境信息。
Corresponding aspects of underwater sound channel are summarized and a proper simulation model based upon ray - model is presented ; 5 对海洋声信道的有关问题作了综述，给出了一种适合仿真系统的基于射线声学的海洋声信道模型； 5
Sonar is a term that refers both to the application of underwater sound to the detection and location of objects in the sea and to the apparatus used in such application 声纳有双重意义，一方面指的是运用水面下的声音来探测并定位海中物体，另方面则是指探测时所用的仪器。
The applications include underwater acoustic channel estimation , de - convolution , target tracking and inverse problems of underwater sound field . it is shown that sa and ga have the capability of solving the specific problems 对这些技术和方法的深入研究，有可能为水声工程领域提供新的技术手段，找得新的发展方向。
In this paper , the self - adaptive filter , the wavelet transform and the fourier transform are used to detect the stationary and the non - stationary signal of underwater sound in anisotropic noise field 本文以各向异性噪声场为例，分别对声矢量信号中的声压、振速探讨应用自适应滤波、小波变换、短时傅里叶变换检测水声平稳和非平稳信号的应用效果。
Area electronic buoys system is a large - scale underwater sound equipment of tracking and locating moving objects such as submarines , torpedoes and ships . with advanced vector sensors as detective devices , it has excellent antinoise performance , and its signal noise ratio is high 区域电子浮标系统是一套大型的水声跟踪定位设备，其主要任务是准确跟踪和定位海上多个运动目标(如潜艇、鱼雷、船只等)的运动轨迹。
The main work of the first part includes : introducing some methods of underwater sound positioning and analyzing their performance , analyzing the theory of measuring direction and distance of the target by three elements symmetrical and dissymmetrical array , comparing the measuring error of two kinds of array , and giving the theory of the generic arrays and discussing the phase wrapping and the distance wrapping in passive ranging 对被动测距技术的研究工作主要包括：简单介绍了水声定位的几种方法，并对其性能进行了分析对比，分析了三元对称阵和非对称阵测向测距的原理，对两种阵型的测向测距误差进行了对比分析，还给出了一般阵型测向测距原理，最后还对被动测向测距中存在的相位模糊和距离模糊问题进行了探讨。
By analyzing and processing the underwater sound signals received on the array , we can get the parameters of ocean environment . compared with traditional methods of direct point measurement , ocean acoustic tomography has obvious advantages : much simpler and more effective , and it can continuously monitor ocean environment in a large area for a long time 海洋声层析技术通过分析处理水声接收基阵接收到的海洋信道中的水声信号来反演海洋环境参数，这种方法方便、高效并且可以进行长时间的大范围连续监测，与传统的直接测量的方法相比有明显的优势。
The submarine structure is simplified to single or double infinite cylindrical shell stiffened with rings , bulkheads and stringers , focusing on underwater sound radiation from the single shell . the shell motion is described by donnell ' s theory including excitation forces and reactions of rings , bulkheads , stringers and fluid , which leads to the fluid - structure coupling vibration equation . expressing displacements by velocities , applying modal expansion circumferentially and fourier transformation longitudinally result in the shell ' s modal equations of motion 壳体的运动方程采用较为简单的donnell理论描述，运动方程中包括了激励力、加筋结构(环肋、舱壁和纵骨)和流场对壳体的作用力，从而组成流场-结构的耦合振动方程，并进一步将方程中的位移用速度表示，然后沿轴线方向进行fourier变换，将速度和各项荷载沿圆周方向进行模态展开，得到了壳体振动的模态运动方程。
