摘要
在中低频段(通常为数百至数千赫兹频率范围),传播损失、时空相关性以及时空平稳性等水声信道特性是主、被动目标探测和远程通讯技术研究的重点。为了模拟信道的时空去相关特性,应用KrakenC传播模型得到理想信道传递函数H(r,ω),并在此基础上,提出了新的基于信道时延的相位加扰方法。通过数值仿真,该方法可以很好地在统计特性上模拟海试LoFAR’08中的实际浅海信道测量数据。测量数据由拖曳式电火花声源(有效带宽为300Hz^2.5kHz)激励浅水信道得到。
In the Low-mid frequency band(Typically,several hundred hertz to several kilohertz),the main underwater channel features are important to the active/passive target detection and long-range communication problems,such as the transmission loss,temporal-spatial coherence and nonstationarity.In order to simulate the channel spa-tial-decorrelation characteristics,a new delay-dependence perturbation method is provided to modify the ideal channel transfer function H(r,ω),which is obtained through the KrakenC acoustic-field calculation model.The numerical simulation results of the macro-parameter channel model conform well to the real shallow water channel measurements with towed electric-discharge sources(Effective bandwidth: 300Hz-2.5kHz) in the sense of statistical characteristics.
出处
《声学技术》
CSCD
2010年第6期565-568,共4页
Technical Acoustics
基金
国家自然科学基金(60532040)
国家安全重大基础研究基金(613660203)
关键词
水声
浅海
信道仿真
混合建模
underwater acoustic
shallow water
channel simulation
hybrid model