PASSIVE SENSING, OCEAN AMBIENT NOISE
Abstract
Previous research effort has demonstrated that coherent processing of low-frequency noise(f<50Hz) can provide coherent arrivals between hydrophones deployed ~100km apart in theSOFAR channel. Those coherent noise arrivals provide a means to develop totally passiveversions of existing ocean sensing and monitoring methods (such as acoustic thermometry ortomography) that traditionally require active sources. Under the hypothesis that such coherent noisearrivals can also be extracted across whole ocean basins, i.e. for very large sensor separationdistance (~1000kms) along the SOFAR channel, in order to achieve very long-range passiveocean monitoring, a 3 year research effort is proposed to investigate the long range spatial coherence of low-frequency deep water ambient noise recorded on the global IMSCTBTO network in order to ultimately assess the feasibility of passive ocean sensing andmonitoring up to basin-scale. Results from this study are expected to help guide the design offuture cabled or autonomous ocean observatory systems capable of passive ocean monitoring atthe global scale.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 03, 2017
- Source ID
- N000141712189
Entities
People
- Karim G. Sabra
Organizations
- Georgia Tech Research Corporation
- Office of Naval Research
- United States Navy