1. Ocean-Tune: A Community Ocean Testbed for Underwater Wireless Networks Puget Sound Deployment Revision 0.1 July 19, 2012 Sumit Roy, Payman Arabshahi {roy,payman}@ee.washington.edu

2. Location Hood Canal, a natural salt-water fjord forming the western lobe, and one of the four main basins, of Puget Sound; 18 nautical miles west of Seattle. The entrance to the canal is relatively shallow, about 150’. Just south of the entrance the canal becomes very deep, to 500 and 600’. 2

3. Environmental Conditions The ’sill’ at the entrance of Hood Canal creates a condition in the canal that does not allow the water to flow or exchange very easily with the changing tides and seasons. The ’sill’ tends to retain the water (reduces the exchange) in the canal and estimates of complete water exchange rates are in the magnitude of years. The water of Hood Canal can also be highly stratified, with an upper layer of different temperatures and salinities. Overall this represents a very unique environment for acoustic propagation. 3

4. Major Testbed Components Ultimately the testbed will consist of two buoys, two bottom nodes, and possibly one Seaglider with a combination TBD of OFDM and software defined modems (five OFDM and two software defined modems). Note: It may not be possible to retrofit a Seaglider with an OFDM or software defined modem due to onboard power/physical constraints; if so, then the Seaglider will be replaced by a third buoy or bottom node. All stationary and mobile nodes will provide a number of ports/connectors for deployment of sensors (e.g. CTD, O2, pH, pCo2, dissolved organic matter, N2, chlorophyll, fluorescence). 4

5. AquaSeNT OFDM Modem Specs, details, and a photo go here. 5

6. AquaSeNT Software Defined Modem Specs, details, and a photo go here. 6

7. Buoys We plan to leverage existing Internet connected Oceanic Remote Chemical Analyzer (ORCA) buoys in Hood Canal, developed and operated by the Hood Canal Dissolved Oxygen Program (HCDOP) (PI, Dr. Jan Newton, UW APL). These buoys are autonomous moored profiling systems providing real-time data streams of water and atmospheric conditions. They consist of a profiling underwater sensor package with chemical and optical sensors, and a surface mounted weather station, solar power system, a wind power system, winch, and custom computer and software package equipped with Wifi/cellular communication. 7

8. Buoys Physically, ORCA consists of a surface ATLAS float in a 3-point mooring configuration. The float has a platform, which supports a Linux micro-computer, Wifi communications system, marine batteries, solar panels, a wind power system, meteorological station and an electric winch with slip rings. A Seabird CTD package at the end of a conducting cable provides pressure information to the surface computer, which in turn drives the winch. Weather and CTD data is transmitted back to the University of Washington lab after each cast. 8

9. Phase I of Deployment 9 In Phase I of deployment, within three months of receipt of the OFDM modems from AquaSeNT, two OFDM modems will be integrated into two buoys. Two buoys in the southern tip of the canal near Skokomish (Hoodsport and Twanoh, opposing each other on two sides of a land mass) will be retrofitted with OFDM modems. A float may act as a relay between the two buoys. Phase I

10. Subsystem Technology Readiness Levels Entry and exit TRLs are measured at start and end of the 3-year project. Entry TRL Exit TRL OFDM Modem69 Software Defined Modem47 Modem equipped Buoys99 Communication Protocols38 10

11. Experiment Plan 11 To be determined …

12. Outreach to Research Community To be determined … 12