By Lufen Xu, Tianzeng Xu
Digital Underwater Acoustic Communications makes a speciality of describing the variations among underwater acoustic communique channels and radio channels, discusses lack of transmitted sound in underwater acoustic channels, describes electronic underwater acoustic conversation sign processing, and gives a complete connection with electronic underwater acoustic conversation equipment.
This ebook is designed to function a reference for postgraduate scholars and practising engineers occupied with the layout and research of underwater acoustic communications platforms in addition to for engineers enthusiastic about underwater acoustic engineering.
- Introduces the fundamentals of underwater acoustics, besides the complicated functionalities had to in achieving trustworthy communications in underwater environment
- Identifies demanding situations in underwater acoustic channels relative to radio channels, underwater acoustic propagation, and solutions
- Shows how multi-path buildings will be considered time range signals
- Presents a brand new, powerful sign processing process, and a complicated FH-SS approach for multimedia underwater acoustic communications with reasonable conversation levels (above 20km) and premiums (above 600bps)
- Describes the APNFM method for underwater acoustic conversation apparatus (including either civil and armed forces applications), to be hired in energetic sonar to enhance its performance
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Extra info for Digital Underwater Acoustic Communications
83) where wl and ul are represented by ml by means of Eqs. 75), and the velocity and attenuation for each normal mode traveling in the x direction are determined by ml. Since the second term in the square bracket in Eq. 81) is very small, it may be considered that all normal modes have the same velocity c0 ¼ u∕k0. 84) Its amplitude is reduced by obeying the law of exp(Àblx). We see that the higher the order of the normal modes, the larger the corresponding attenuation. 86) As bl∕k0 ( 1 by examining Eq.
We see that the higher the order of the normal modes, the larger the corresponding attenuation. 86) As bl∕k0 ( 1 by examining Eq. 85), it means that the attenuation will be small when sound wave travels a distance equal to one wavelength, and the sound wave can get into sound shadow zones for the ranges of many wavelengths due to the sound diffraction effect. However, traveling absolute distances are still very near as a result. 18 dB/m, thus entering into the sound shadow at 100 m, and the attenuation of sound intensity is up to 18 dB.
Brekhovskikh, Ocean Acoustic, Science Press, Beijing, 1983. , The multipath structures of signal waveforms in shallow water with thermocline, Acta Oceanologica Sinica 3 (1) (1981) 57e69. Y. Zhu, R. , Theoretical analysis on pulsed waveforms in shallow water with an ideal thermocline, Acta Acustica 20 (4) (1995) 289e297. M. , New York, 1960. Q. , Fundamentals of Digital Communications, Electric Industry Press, 2007. L. Freitag, M. Stojanovic, D. Kilfoyle, J. Preisig, Highrate phase-coherent acoustic communication: review of a decade of research and a perspective on future challenges, in: Proc.