waves with nonlinear internal gravity waves
Abstract
Deep Water Acoustic Scattering and Noise The long-term goals of this research are to characterize ambient noise in the deep ocean, to understand acoustic scattering due to internal waves, and to develop new processing techniques that facilitate acoustic tomography using fixed and mobile platforms. The specific objectives of the proposed project are: 1. To analyze the modal structure of noise in the Philippine Sea and to develop improved models for noise above and below the conjugate depth; 2. To investigate the use of random matrix theory models for acoustic scattering due to internal waves; 3. To quantify acoustic scattering using Philippine Sea measurements and compare to random matrix theory predictions; 4. To develop new pre-processing techniques for tomographic receptions using the results of the noise and scattering studies. These topics are relevant to the Navy for several reasons. First, a thorough understanding of the noise environment is required to design arrays and algorithms for challenging ocean environments. In particular, there is great interest in the variation of noise below the conjugate depth since this determines the performance of bottom-mounted arrays designed to exploit reliable acoustic path (RAP) propagation. Second, sonar modeling requires understanding the effects of oceanic variability on acoustic propagation. It is important be able to efficiently and accurately model this variability at multiple depths and ranges in highly dynamic ocean environments such as the Philippine Sea. Finally, improving front-end signal processing provides better automatic detection of arrivals, which improves the efficiency and accuracy of tomographic inversions. Enhanced pulse compression and detection algorithms may also be relevant for other sonar applications that use active sources. This three-year basic research project is a collaboration between Kathleen Wage (George Mason University) and Lora Van Uffelen (University of Hawaii).
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512063
Entities
People
- Kathleen E Wage
Organizations
- George Mason University
- Office of Naval Research
- United States Navy