Underwater acoustic swept carrier communications

Barbour, Robert Leslie (1979) Underwater acoustic swept carrier communications. Masters thesis, Memorial University of Newfoundland.

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Abstract

Underwater acoustic communication is severely affected by multipath interference. A novel idea based on the observation that the time separation between direct and multipath signals can be utilized to suppress multipath interference is developed in this thesis. -- A proposed system employs a carrier with instantaneous frequency swept periodically in time over a broad frequency range. The carrier is narrowband modulated by a message signal resulting in a time varying instantaneous spectrum of the transmitted signal. The received signal is demodulated by a bandpass tracking receiver. The low sweeping frequency determines the multipath spectrum and the degree of multipath suppression by the tracking bandpass receiver. -- Computer evaluation of the swept carrier concept together with lab and field tests conducted on a system prototype show conclusively that swept carrier communication is a feasible technique for multipath interference suppression.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/10135
Item ID: 10135
Additional Information: Bibliography : leaves 71-76
Department(s): Engineering and Applied Science, Faculty of
Date: 1979
Date Type: Submission
Library of Congress Subject Heading: Underwater acoustics; Acoustical engineering.

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