Analysis of 200 Hz CW Tone Propagation Signal Recorded during the September 1987 VLA Experiment
SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
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This technical report discusses the analysis of the 200 Hz CW tone signals recorded on Julian Day 270 and 272, during the September 1987 Single Vertical Line Array Experiment in the North East Pacific. On Julian Day 270, a 200 Hz CW tone was projected for various time lengths and three different source depths, 165 km from the Vertical Line Array VLA. On Julian Day 272, the 200 Hz source was towed away from the VLA for 10 hours at a speed of 5 kts. The signals were received by the VLA, which extended from a depth of 400 m to 1300 m. Power spectra between 0 and 250 Hz are presented for selected channels of the array. Vertical distribution of power across the Vertical Line Array is obtained for the signal and noise at 200 Hz. Finally, arrival structures of the signal and of the noise at 200 Hz, are obtained using conventional beamforming techniques. Nine data tapes, recorded during these transmissions, were processed, and the results are presented in this report. The comprehensive environmental information, collected during the experiment, allows the successful acoustic modeling of both the fixed range case, where range between the VLA and the source varied from 0 to 100 km. The CONGRATS ray-theory model of the GSM and the ATLAS normal mode model are used, produce similar results which are in good agreement with the experimental results.
- Acoustic Detection and Detectors