Abstract
The use of phase measurement for sinusoidal signal arrival-time extraction of overlapping signals subjected to multipath conditions in shallow water is considered. The phase-measurement method is applied to signal data from a research cruise. The method does not give convincing results. For distances greater than 10 000 m the results are negative. The results obtained are strongly dependent on the sound velocity profile. The signal pulse length was a very important parameter in the results. The optimal pulse length was shown to be greater than 10 msec and less than 100 msec regardless of the hydrophone depth for the two depths investigated. Subject Classification: [43]30.20; [43]60.30.
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