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Acoustic communication experiments in the Westerschelde shipping lane using direct-sequence spread spectrum signals


Author: Walree, P.A. van · Gijzen, M.B. van · Pattipeilohy, M.
Publisher: Gdansk Univ. of Technology
Place: Gdansk
Institution: TNO Fysisch en Elektronisch Laboratorium
Source:Proceedings of the 6th European conference on underwater acoustics, ECUA-2002, 24-27 June, Gdansk, Poland, 543-548
Identifier: 95513
ISBN: 83-907-5918-7
Keywords: Physics · Underwater communication · Acoustic communication · Spread spectrum · Shipping lanes


Spread-spectrum underwater acoustic communication signals were broadcast in the vicinity of a busy shipping lane. Four spreading code lengths were applied, leading to bit rates between 65 and 667 bit/s in the passband between 10 and 14 kHz. Excellent results are obtained for a track over a predominantly flat bathymetry, whereas communication from inside the shipping lane upward to the coast turned out to be more challenging - yet with good results. It is shown that multipath propagation adversely affects the quality of the received signals, and that this effect is overcome by using a longer spreading code.