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2009, 11

Guosong Zhang, Jens M. Hovem, Hefeng Dong, Tor A. Reinen

A design for timing pulse acquisition in underwater multipath environments

language: English

received 03.08.2009, published 17.09.2009

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A design is proposed for acoustic timing pulse acquisition, and it is suitable for uses in reverberant multipath environments. This scheme uses two identical broadband pulses for timing, and it is motivated by passive phase conjugation. It is simple in signal processing. The first pulse is used as a probe pulse to estimate the channel impulse response, and then the received probe replaces the replica signal later to catch the second pulse. Within coherence time, a fixed threshold can be preset. A detector makes a decision on the correlation coefficient between the first pulse and the second one, as the coefficient has a great immunity to channel impulse response. In this way, it is easy and robust for receivers to realize acquisition. It shows advantages for independent receivers operating in the shallow water channel.

Keywords: acquisition, threshold, timing correlation, passive phase conjugation

12 pages, 13 figures

Сitation: Guosong Zhang, Jens M. Hovem, Hefeng Dong, Tor A. Reinen. A design for timing pulse acquisition in underwater multipath environments. Electronic Journal “Technical Acoustics”,, 2009, 11.


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Guosong Zhang is a PhD candidate of Norwegian University of Science and Technology, Trondheim, Norway, and he is working on underwater acoustic communication and signal processing.

e-mail: guosong.zhang(at)


Jens M. Hovem is a graduate from the Norwegian University of Science and Technology, NTNU where received the Dr. Ing. degree in 1966. His main fields of interest are underwater acoustics and signal processing. His experience includes two periods at SACLANT Undersea Research Centre (now NATO Undersea Research Centre, NURC) in La Spezia, Italy, both as scientist and Division Chief, and with the SINTEF in Norway. In 1991 he was appointed professor at the Department of Electronics and Telecommunication at NTNU conducting research and giving coursers in underwater acoustics and signal processing. Hovem has been visiting scientist at Applied Research Laboratories (ARL), The University of Texas at Austin in 1979 and 2002 and to C.N.R.S Laboratoire de Mecanique et d’Acoustique, Marseilles, France in 1998. He is now professor emeritus at the Department of Electronics and Telecommunication at NTNU, and senior advisor to SINTEF-ICT. He is the author of the new book “Marine Acoustics - The Physics of Sound in Marine Environments” to be published by Peninsula Publishing. Los Altos, CA, USA.


Hefeng Dong is the professor in acoustics at Norwegian University of Science and Technology, Trondheim, Norway since 2002. Her research interest is in underwater acoustics, numerical modeling of wave propagation in poroelastic medium and geoacoustic inversion.


Tor Arne Reinen received a Ph.D. degree in Electrical Engineering and Telecommunications from Norwegian University of Technology, Trondheim, Norway. He worked as a scientific assistant in telecommunications at NTNU in 1983, and has been employed at the acoustics group of SINTEF ICT from 1984, interrupted by a PhD scholarship 1989-91. In SINTEF he has been working as a research scientist and lately as senior scientist, on physical and technical acoustics, including field and lab experiments, physical modelling and signal processing. He is serving clients from the oil and gas industry, together with military, aerospace, noise abatement, and ultrasound sensor industries. Projects include wave propagation, ultrasound transducer design, ultrasound pulse echo techniques for high temperature applications, vortex induced noise, active noise control, noise classification using neural networks, and monitoring of subsea pipelines.