Abstract
Imperfect knowledge of the salient characteristics of the propagation medium limits the performance of acoustic array processors at long ranges in the ocean. Holographic and phase conjugation techniques can be used to diminish the range-integrated effect of the medium and reconstruct the wave front in the vicinity of a scatterer or other signal source. Then, using a back-propagation technique that focuses sound at the position of the unknown source, the location of the source can be determine. In this paper, the WKB approximation is implemented for a range-dependent ocean with both N2 bilinear and exponential stratification of the sound-speed profile. The results of the analysis and simulation show the possibility of localizing a source at large distance with great accuracy.
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