Shallow-water passive acoustic detection using normal modal components in fluctuation-based processing

Jacob George

doi:10.1117/12.277131

23 June 1997 Shallow-water passive acoustic detection using normal modal components in fluctuation-based processing

Jacob George

Proceedings Volume 3069, Automatic Target Recognition VII; (1997) https://doi.org/10.1117/12.277131
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

The use of normal modes in fluctuation-based processing for passive shallow water acoustic detection of submerged sources is investigated. Simulations using a Pekeris waveguide have been done. The results indicate that fluctuations of the total acoustic field ar generally larger for near-surface noise sources, than for deeper ones. When individual modes are considered, the fluctuations are quite large when all noise sources are located near the ocean surface. But fluctuations are reduced when even a weak noise source is present at a deeper location. Fluctuations are always high in the small region in source depth where the modal function is close to zero. The submerged source indicator introduced by Wagstaff exhibit similar trends as the standard deviation of fluctuations, and accentuates those trends. Further research is suggested to learn the effects of using a finite number of hydrophones for modal projection. The effects of random ambient noise, and ambient noise sources distributed in a spatial continuum must also be investigated.

Citation Download Citation

Jacob George "Shallow-water passive acoustic detection using normal modal components in fluctuation-based processing", Proc. SPIE 3069, Automatic Target Recognition VII, (23 June 1997); https://doi.org/10.1117/12.277131

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