基于OPNET的水声网络信道仿真研究

水声网络是实现海洋监测、数据采集以及战略通信等的重要手段,但其受水声信道特性制约严重。为此,从介绍水声信道的特性出发,采用Thorp经验公式模拟海水吸收特性,在此基础上对路径损耗进行仿真解算,并改进Wenz噪声模型使之更好地接近水声信道的特性。进而,通过改进OPNET平台内置的传播时延阶段、接收机功率阶段、背景噪声阶段设计水声信道OPNET模型,使其适合水声信道,基本实现对真实信道的近似模拟。最后,设计OPNET移动网络模型,将模拟的水声信道加进移动网络进行仿真,分析水声信道特性对网络性能的影响。

Research and Simulation of Underwater Acoustic Network Channel Based on OPNET

Underwater acoustic network is an important means of realizing marine monitoring,data collection and strategic communications,however,its performance is seriously restricted by the characteristic of underwater acoustic channel.According to the introduction of characteristics of underwater acoustic channel,the empirical formula Thorp was used to simulate water absorption characteristic,on the basis of which,path loss was calculated.And Wenz noise model was improved for the purpose of approaching the noise characteristic of underwater acoustic channel more closely.Furthermore,in order to adjust to underwater acoustic channel,an OPNET model was designed by improving propagation delay stage,receiver power stage and background noise stage within OPNET platform,with the result of realizing the approximate simulation of the real channel basically.Finally,an OPNET mobile network model was designed with adding the simulated underwater acoustic channel model,and the influence of characteristics of underwater acoustic channel for network performances was analyzed.