Iridium WOCE/SVP/BP Buoy
description
Transcript of Iridium WOCE/SVP/BP Buoy
Iridium WOCE/SVP/BP
Buoy
METOCEAN WOCE/SVP/BP/Iridium
ByBernie Petolas, P. Eng.
Product ManagerMETOCEAN Data Systems Ltd.
Dartmouth NS B3B 1R9Canada
October 14, 2002 DBCP Technical Workshop 2002 Page 2
Introduction
• Product and Iridium Overview
• Block Diagram of Iridium Buoy
• Pros and cons of Iridium
• METOCEAN’s Iridium Communication
Infrastructure
• Deployment in Bering Sea
• Conclusions
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Product Overview
• Hourly data acquisition
• Barometer, SST and Submergence Sensors
• GPS positioning
• Bi-directional communications using the Iridium Satellite Network
• Customer Command/Data Interface (WWW) • Enhanced METOCEAN Digital Controller • Modular TMOS Software Architecture
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Overview of Iridium System
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Pros and Cons of Iridium
• Pros:• Bi-directional communications• Large data bandwidth• True Global Coverage (both time and space)• Potential data transmission costs saving• All digital connection
• Cons:• Size and weight of unit• Power budget versus telemetry costs• Data dissemination infrastructure• Unknown RF issues in high seas
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Block Diagram of WOCE/BP/Iridium Buoy
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System Components: Data MODEM
• Iridium 9500 Data Modem data rate is 2400 bits per second.
• Direct digital connection between buoy and METOCEAN via satellite network
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Digital Communications
• Direct connection via Internet to METOCEAN• An Web interface is always available to receive
messages and send commands• Buoy calls the Iridium ground station, negotiates
a PPP and connects to METOCEAN server • Programmable communication duration and
frequency
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METOCEAN’s Iridium Communication Infrastructure
• Based on METOCEAN iLink™ Server • Server monitors a port for incoming packets
from Iridium buoys• Accepts simultaneous connections from
multiple platforms• In effect, each buoy has a direct connection to
the database via the Internet
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Message Processing
• Each buoy maintains a queue of hourly reports, transmitted upon connection to the server
• An acknowledgement is sent back only if the data is successfully stored in the database
• Upon acknowledgement, the buoy deletes the message from its transmission queue
• If the message queue is full, the oldest message is deleted
• Programmable parameters allow flexibility in message throughput, data loss prevention and delivery costs
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Command Processing
• Provided by an outgoing message queue in the database
• User submits commands via web page• When connected, the buoy sends periodic command
request packets and an acknowledgement after a command is received and executed
• Commands are stored in the database• All buoy commands can be executed via the Iridium
interface• Very powerful but dangerous tool!
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Deployment in Bering Sea
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Conclusions
• Two-way communications and large bandwidth produce power savings
• Iridium message throughput is about 80%• Our database management system is
100%• Allows reconfiguration after deployment• Potential cost savings of 33% over other
satellite systems • METOCEAN can offer data services