The study on time-variant characteristics of under water acoustic channels

Fangkun Jia, En Cheng, Fei Yuan
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引用次数: 11

Abstract

With the characteristics of high ambient noise level, very narrow bandwidth, low carrier frequency, enormous propagation latency and time-space-frequency variant multipath effect, the stochastic ocean channel is very complex and difficult to achieve reliable UWA communications. The study of transmission characteristics is an important but weak link in underwear acoustic communication technology, so the study of underwater acoustic channel model has a very important practical significance. In this paper, based on conventional ray theory we have established N-path deterministic model, while taking advantage of BELLHOP, and introducing WSSUS channel model for shallow UWA channel transmission characteristics, and also have improved a shallow UWA time-variant channel model testing system performance. Comparing with the deterministic model, Simulation results show that the model is more intuitive and realistic.
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水声通道时变特性研究
随机海洋信道具有高环境噪声、极窄带宽、低载波频率、巨大传播时延和时空频变多径效应等特点,非常复杂,难以实现可靠的UWA通信。传播特性的研究是内衣水声通信技术中一个重要但薄弱的环节,因此研究水声信道模型具有十分重要的现实意义。本文在传统射线理论的基础上,建立了n路确定性模型,同时利用BELLHOP,引入WSSUS信道模型对浅UWA信道的传输特性进行测试,并改进了浅UWA时变信道模型测试系统性能。仿真结果表明,与确定性模型相比,该模型更加直观、真实。
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