Abstract
Long vertical arrays provide array gain and allow separating sources due to differences in vertical arrival angle. Multipaths from one source will also be received at several arrival angles, each multipath received preferentially over a different subaperture of the vertical array. For low frequencies in the deep ocean, the optimum subaperture based upon intensity distribution will often be so large that signal multipaths will be resolved causing serious array signal gain degradation. A new processor using the sound speed profile is suggested for use on the appropriate subaperture to coherently recombine the multi- paths and thus recover the lost signal gain. The arrival angle of one multipath is a function of depth, so phases are calculated to take this into account. Array signal gain (ASG) was determined by calculating the complex field at a vertical array using a model of ocean propagation. The ASG degradation (ASGD), and multipath resolution as a function of vertical aperture were calculated. For the case where several multi- paths contributed substantially to the energy received, 5-7 dB of ASGD were observed.
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