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