| 李轩,王磊,孙长瑜.浅海中低频水声信道仿真研究[J].声学技术,2010,(6):565~568 |
| 浅海中低频水声信道仿真研究 |
| Low-mid frequency random underwater channel simulation in shallow water environment |
| 投稿时间：2009-12-13 修订日期：2010-03-20 |
| DOI： |
| 中文关键词: 水声 浅海 信道仿真 混合建模 |
| 英文关键词: underwater acoustic shallow water channel simulation hybrid model |
| 基金项目:国家自然科学基金(60532040);国家安全重大基础研究基金(613660203) |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 spatial-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 senseof statistical characteristics. |
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