Abstract
Underwater acoustic communications data using phase modulated signals were collected during the Littoral Warfare Advanced Demonstration 98-1 experiments. The signals were projected from both a drifting modem and from a towed frequency source. Data of several different baud rate were transmitted and used to (1) study the temporal variation of the acoustic impulse response of the ocean and (2) evaluate the performance of the phase coherent communication algorithm. The amplitude and phase variations are analyzed on a fast scale (within the transmission packet of 5 s) and a low scale (minutes to hours). The performance of the communication algorithm is correlated with the phase rate and amplitude fluctuation statistics, the signal-to-noise ratio, etc. The data are compared with simulation results and used to guide performance predictions. [Work supported by the Office of Naval Research.]
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