期刊
APPLIED ACOUSTICS
卷 78, 期 -, 页码 7-10出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2013.10.009
关键词
Bionic underwater acoustic communication; Dolphin whistles; Passive time reversal mirror; M-ary coding; Covert performance
类别
资金
- National Natural Science Foundation of China [51179034]
- Fundamental Research Funds of the Central University [P223513012]
- China Postdoctoral Science Foundation [2013M531015]
- Science and Technology on Underwater Acoustic Laboratory Funds [9140C200801210C2001]
This paper applies dolphin whistles to covert underwater acoustic (UWA) communication and proposes a UWA communication scheme based on M-ary bionic signal coding. At the transmitter end, the scheme maps multiple information bits into a dolphin whistle through a signal selector. At the receiver end, passive time reversal mirror (PTRM) is used for channel equalization and source information is restored according to the decision of which whistle is transmitted. The scheme has high spread spectrum gain. The anti multi-path performance is greatly improved when using PTRM. Different from traditional covert UWA communication methods, this mimicked signal is unlikely to alert an adversary even in high SNRs because of its real existence in marine environment. A tank experiment is conducted for the scheme, at communication rate of 50 bit/s with SNR -5 dB user information is recovered at a very low bit error rate. The results of tank experiment demonstrate the feasibility of this covert UWA communication scheme. (C) 2013 Elsevier Ltd. All rights reserved.
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