Monterey Bay acoustic tomography : signal processing using multi-channel data-synchronized quadrature phase demodulation.

Abstract

An ocean acoustic tomography experiment was conducted in Monterey Bay from December 12-16, 1988 and had the following goals: 1) validate theories describing the relationship between acoustic travel time fluctuations and ocean waves, both surface and internal , 2) determine the effects of the complex bathymetry of Monterey Bay Submarine Canyon on acoustic propagation, and 3) test the first shore-based acoustic tomography data acquisition system. This thesis developed a multi-channel data-synchronized quadrature phase demodulator for pre-processing the acoustic data. The demodulator fed the resulting baseband signals to a Zenith personal computer equipped with an A/D board for further processing. Preliminary results of the data analysis for one of the receiving stations is given to demonstrate the system effectiveness.