Abstract
A vertical transmitting array was implanted in Block Island Sound in November 1970. A theoretical study was undertaken to determine the optimum utilization of such an array to excite individual normal modes. The results of this study are described. Amplitude and phase matching, the two basic methods to emphasize individual modes, are outlined. In matching to amplitude, either a course or more exact fit to the mode amplitude may be utilized. These three approaches to emphasize individual modes were considered. Simple cases of these approaches were evaluated for the physical characteristics of the implanted array using a computer program. BIFI velocity profiles typical for summer and winter were used. Propagation loss was calculated for individual modes when the array was matched in turn to modes 1–4 for each profile and mode. In this manner, the relative signal levels corresponding to each approach were obtained and their effectiveness evaluated.
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