Sonobuoys

Sonobuoys

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Published in Alexander D. Poularikas, Stergios Stergiopoulos, Advanced Signal Processing, 2017

G. Clifford Carter, Sanjay K. Mehta, Bernard E. McTaggart

These small expendable sonar devices contain a transmitter to transmit signals and a single hydrophone to receive the signal. Sonobuoys are generally dropped by fixed-wing or rotary-wing aircraft for underwater signal detection.

Bluelink ocean forecasting Australia: 15 years of operational ocean service delivery with societal, economic and environmental benefits

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Journal Information

Published in Journal of Operational Oceanography, 2020

Andreas Schiller, Gary B. Brassington, Peter Oke, Madeleine Cahill, Prasanth Divakaran, Mikhail Entel, Justin Freeman, David Griffin, Mike Herzfeld, Ron Hoeke, Xinmei Huang, Emlyn Jones, Edward King, Barbra Parker, Tracey Pitman, Uwe Rosebrock, Jessica Sweeney, Andy Taylor, Marcus Thatcher, Robert Woodham, Aihong Zhong

Figure 8 shows how acoustic information can be inferred from oceanographic forecasts. At the marked location, which is on the edge of a warm-core eddy in the Tasman Sea, a vertical profile of sound speed, computed from temperature, salinity and depth, shows two accessible low-loss acoustic paths. In the top 50 metres, increasing sound speed creates a half-channel acoustic path, which gives extended ranges to hull-mounted sonars, or targets in that layer. Beneath this, a shallow sound channel extends from 50 to 286 m, with an axis around 200 m. This provides an opportunity for extended ranges to be achieved by passive sonars, including sonobuoys.

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Bluelink ocean forecasting Australia: 15 years of operational ocean service delivery with societal, economic and environmental benefits