High Frequency Acoustic Channel Characterization for Propagation and Ambient Noise
Abstract
LONG-TERM GOALS. The long term goals of this project are to research the physics of high frequency (1-50 kHz) acoustic propagation and ambient noise in the ocean. This work is relevant to many types of Navy sonars such as active ASW and MCM systems and underwater acoustic modems for communications. Improved understanding is leading to better ways to adapt to and exploit the environment for enhanced system performance. OBJECTIVES. One objective of this year s work has been to develop an accurate, dynamic acoustic model that could be used to understand observed Doppler spread in communications transmissions. The Doppler spread is caused by a combination of effects due to vertical and horizontal velocity components introduced through surface and source/receiver motion. A second objective for this year has been to develop a data inversion strategy for estimating geoacoustic properties of the seabed using the ambient noise field. Cross-correlation (Passive Fathometer) ambient noise processing [1] was applied with high resolution beamforming methods to better identify seabed layers. This was used to constrain the geoacoustic inversion for the properties of each seabed layer [2].
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2006
- Accession Number
- ADA630905
Entities
People
- Martin Siderius