Spatial and Temporal Coherence in a Long range, Upslope Environment
Abstract
In an active acoustic test conducted off the USA Pacific Coast in November-December 1991, a low-frequency source, kept stationary over the deep basin, insonified from longrange the coastal slope and shelf. An autonomous, bottom-mounted horizontal array was deployed at the transition from slope to shelf. The inter-hydrophone coherence along the array deteriorated with spacing, and the beam former output exhibited a corresponding degradation in array signal gain. The coherences were measured after matched filtering of the received hyperbolic frequency-modulated signals. The spatial coherence is in strong contrast with the good temporal coherences for subsequent transmissions. The excellent measured temporal coherence is shown to have the potential to reduce the levels of direct arrivals and of reverberation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- AD1114299
Entities
People
- Theo Kooij
- Theresa S. Dedominicis
Organizations
- Naval Information Warfare Systems Command
- SACLANT ASW Research Centre