HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

Identification of Rays in a Signal Registered from the Drifting Ship

pp. 313-316, vol. 2, 1999

A. A. Stromkov
Institute of Applied Physies RAS, Nizhny Novgorod, Russia

A. Yu. Kazarova
Institute of Applied Physies RAS, Nizhny Novgorod, Russia

A. L. Virovlyansky
Institute of Applied Physies RAS, Nizhny Novgorod, Russia

L. Ya. Lyubavin
Institute of Applied Physies RAS, Nizhny Novgorod, Russia

Key words:

Abstract: Possibilities of ray identification in the ship tomography experiment in Western Mediterranean are discussed. The pulse signals (M-sequences) emitted by the stationary source located at the axis of the subsurface acoustic waveguide (the axis depth was 125 m) were registered from the board of the drifting shift. Frequency Doppler shift was compensated. It is shown that in the signal registered by a single hydrophone, depending on the hydrophone depth, arrivals of fours rays with steep grazing angles (at small depths), arrivals of pair or arrivals of individual rays (at greater depths) can be resolved: Due to the drift the distance between the source and receiver was always known with some error. In spite of this fact the measured differences in ray travel times and in travel times of fours of rays were in good agreement with the theoretical predictions obtained using a ray code.

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© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)