时变空变环境下被动声纳信号仿真

发布时间：2018-06-15 15:57

本文选题：被动声纳信号仿真 + 非平稳模型　；参考：《东南大学》2016年硕士论文

【摘要】：被动声纳系统通常处于时间和空间不断变化的环境,声纳基阵接收到的信号呈现出一定的时变特性。为了给声纳阵列信号处理技术提供多样化的逼真仿真数据,本文围绕被动声纳的工作原理,研究了声纳目标及平台不断运动的时变空变环境下的被动声纳阵列信号仿真方法,并设计研制了基于TigerSHARC201芯片的实时被动声纳阵列信号仿真系统。论文的主要工作如下：1、介绍了被动声纳阵列信号仿真的需求和实现过程,整个仿真系统包括五个基本模块,分别为目标运动轨迹仿真、目标辐射噪声仿真、水声信道仿真、阵元信号仿真和海洋环境噪声仿真。2、分析了由于目标和平台不断运动,被动声纳所处环境在时间和空间上不断变化,从而引起的被动声纳信号时变特性,包括舰船辐射噪声的非平稳性、不可忽略的多普勒频移,以及平台机动时的拖曳阵阵形畸变。3、研究了时变空变环境下的被动声纳阵列信号仿真方法,以克服传统仿真方法在被动声纳信号时变特性仿真上的局限性。针对非平稳舰船辐射噪声的仿真,提出了参数非平稳的建模方法,包括时变谱级、连续谱以及线谱的仿真；对于目标和平台相对运动引起的不断变化的多普勒频移,提出基于精确时延滤波器的多普勒频移实时仿真方法；针对拖曳阵平台机动引起的阵形畸变,分别采用圆弧和正弦近似的处理方法,仿真阵形畸变时的被动声纳信号。4、基于TigerSHARC201高速并行信号处理系统,设计并构建了被动声纳阵列信号实时仿真系统。给出了系统总体架构及各模块实现方法,进行了各模块的编程实现以及串联调试,实现了水声环境时空变化、目标平台运动、目标和环境噪声特性可选等条件下的实时信号仿真输出,并通过仿真数据分析验证了本文所设计的被动声纳阵列信号实时仿真系统的可行性及其性能。
[Abstract]:Passive sonar system is usually in the environment of changing time and space, and the signals received by sonar array show certain time-varying characteristics. In order to provide a variety of realistic simulation data for sonar array signal processing technology, this paper focuses on the working principle of passive sonar, and studies the simulation method of passive sonar array signal under the time-varying space-variant environment where the sonar target and platform are constantly moving. A real-time passive sonar array signal simulation system based on TigerSHARC201 chip is designed and developed. The main work of this paper is as follows: 1. The requirement and realization of passive sonar array signal simulation are introduced. The whole simulation system includes five basic modules: target trajectory simulation, target radiated noise simulation, underwater acoustic channel simulation. Array element signal simulation and ocean environment noise simulation. 2. The time-varying characteristics of passive sonar signal caused by the continuous movement of target and platform and the continuous change of time and space in the environment of passive sonar are analyzed. The simulation method of passive sonar array signal in time-varying space variant environment is studied, including the non-stationarity of ship radiated noise, the non-negligible Doppler frequency shift, and the trailing array shape distortion .3. In order to overcome the limitations of traditional simulation methods in passive sonar signal time-varying characteristics simulation. For the simulation of non-stationary ship radiated noise, a non-stationary modeling method is proposed, including the simulation of time-varying spectrum, continuous spectrum and line spectrum, and the changing Doppler frequency shift caused by the relative motion of target and platform. A real-time Doppler frequency shift simulation method based on accurate time-delay filter is proposed, and the circular arc and sinusoidal approximation are used to deal with the formation distortion caused by maneuvering of towed array platform. Based on the TigerSHARC201 high-speed parallel signal processing system, the real-time simulation system of passive sonar array signal is designed and constructed. The overall architecture of the system and the implementation method of each module are given, and the programming and debugging of each module are carried out. The spatio-temporal change of underwater acoustic environment and the movement of target platform are realized. The real time signal simulation output under the condition of target and environment noise characteristics is optional, and the feasibility and performance of the passive sonar array signal real-time simulation system designed in this paper are verified by the simulation data analysis.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN911.7

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