Accession Number : AD1021181


Title :   North Pacific Acoustic Laboratory and Deep Water Acoustics


Descriptive Note : Technical Report,01 Mar 2016,30 Sep 2016


Corporate Author : WASHINGTON UNIV SEATTLE SEATTLE United States


Personal Author(s) : Mercer,James A ; White,Andrew


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=AD1021181


Report Date : 27 Oct 2016


Pagination or Media Count : 26


Abstract : The ultimate limitations to the performance of long-range sonar are due to ocean sound speed perturbations and the characteristics of the ambient acoustic noise field. Scattering and diffraction resulting from internal waves and other ocean processes limit the temporal and spatial coherence of the received signal, while the ambient noise field is in direct competition with the received signal. Research conducted in the North Pacific Acoustic Laboratory (NPAL) program at the Applied Physics Laboratory (APL-UW) is directed toward a complete understanding of the basic physics of low-frequency, long-range, broadband acoustic propagation, the effects of ocean variability on signal coherence, and the fundamental limits to signal processing at long-range that are imposed by ocean processes. The long-term goal of NPAL is to optimize advanced signal processing techniques, including matched-field processing and adaptive array processing methods, based upon knowledge about the multi-dimensional character of the propagation and noise fields and their impact on long-range ocean acoustic signal transmissions.


Descriptors :   sonar , Ocean basins , acoustic propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE