深海RAP下的水声信道特性与通信技术研究
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哈尔滨工程大学水声工程学院

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The Underwater Acoustic Channel Characteristics and Communication Technology under Reliable Acoustic Path in Deep Sea
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College of Underwater Acoustic Engineering,Harbin Engineering University

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    摘要:

    可靠声路径(Reliable Acoustic Path,RAP)是深海声传播的重要通道之一,其受界面影响较小,传播损失较低,可以传播到较远的距离,而且在临界深度以下,环境噪声较低;其次,可靠声路径有效避开了多途扩展现象,声线以结构稳定的直达声为主。在总结可靠声路径物理机理和声传播优势的基础上,对比分析了几种不同海洋参数条件下RAP声传播特性,然后采用射线模型仿真分析了RAP声信道内的接收声线结构,之后基于仿真的RAP信道进行了单载波通信性能的分析。仿真结果发现,在RAP声信道内,直达声能量高,传播损失低,声线结构稳定且多途扩展小,对环境变化不敏感,在35km左右的中远程距离内具有很高的信噪比;相同仿真条件下,RAP区域的误码率较同距离浅深度的接收低很多,而且RAP区域接收信号信噪比高出其他区域10dB左右。该研究结果对于实现垂直方向上深海信息的跨域传输具有重要意义。

    Abstract:

    The Reliable Acoustic Path (RAP) is one of the important channels for deep-sea sound propagation. It is less affected by the interface, has lower propagation loss, and can spread to longer distances, and below the critical depth, the environmental noise is lower; secondly, the reliable acoustic path effectively avoids the phenomenon of multi-path expansion, and the sound ray is dominated by direct sound with stable structure. On the basis of summarizing the physical mechanism and sound propagation advantages of the reliable sound path, the sound propagation characteristics of RAP under several different ocean parameters are compared and analyzed, and then the ray model is used to simulate and analyze the structure of the received sound ray in the RAP sound channel. The single-carrier communication performance of the RAP channel was analyzed. The simulation results show that in the RAP acoustic channel, the direct sound energy is high, the propagation loss is low, the sound ray structure is stable, the multi-path expansion is small, and it is not sensitive to environmental changes, and high signal-to-noise ratio at medium to long-range distances of around 35km; the same simulation conditions The bit error rate of the RAP area is much lower than that of the shallow reception at the same distance, and the signal-to-noise ratio of the received signal in the RAP area is about 10dB higher than that of other areas. The results of this study are of great significance for realizing cross-domain transmission of deep-sea information in the vertical direction.

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  • 收稿日期:2022-07-04
  • 最后修改日期:2022-07-15
  • 录用日期:2022-08-10
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