Transcript Sensor Web Research Center - Department of Electrical

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
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’.
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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.
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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).
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AquaSeNT OFDM Modem
• Specs, details, and a photo go here.
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AquaSeNT Software Defined Modem
• Specs, details, and a photo go here.
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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.
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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.
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Phase I of Deployment
• 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.
Phase I
• A float may act as a relay
between the two buoys.
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Subsystem Technology Readiness Levels
Entry and exit TRLs are measured at start and end of the 3-year project.
•
•
•
•
OFDM Modem
Software Defined Modem
Modem equipped Buoys
Communication Protocols
Entry TRL
6
4
9
3
Exit TRL
9
7
9
8
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Experiment Plan
• To be determined …
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Outreach to Research Community
• To be determined …
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