Integrated approaches to tracking in cluttered environments

A variety of acoustic applications encompass the detection and tracking of signals in highly cluttered environments. Despite the interdisciplinary nature of this problem, often novel approaches and advances are not well known and hence not typically applied outside their respective sub-fields. In this study, we highlight array processing, time frequency analysis and non-stationary signal processing techniques with respect to applications in both physical and underwater acoustics. In particular, we examine the acoustic tracking of small vessels, divers and AUVs in shallow water, harbor areas. An examination of the underlying physical acoustics of the ambient noise sources is a significant factor in the development of improved and novel tracking methods. Time scale filters are investigated for ambient noise reduction from snapping shrimp. The signal processing advantages of a combined two array systems in an L shaped configuration are discussed. Theoretical predictions and simulations are compared with experiments results from a synchronized system of two 24 element arrays deployed at the Kilo Nalu Nearshore Observatory (Honolulu, HI) near the Honolulu Harbor. Novel acoustic tracking techniques based on depth are explored with the two array systems. [Work sponsored by DHS.]