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Iridium WOCE/SVP/BP Buoy

Iridium WOCE/SVP/BP Buoy. METOCEAN WOCE/SVP/BP/Iridium. By Bernie Petolas, P. Eng. Product Manager METOCEAN Data Systems Ltd. Dartmouth NS B3B 1R9 Canada. Introduction. Product and Iridium Overview Block Diagram of Iridium Buoy Pros and cons of Iridium

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Iridium WOCE/SVP/BP Buoy

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  1. Iridium WOCE/SVP/BPBuoy METOCEAN WOCE/SVP/BP/Iridium By Bernie Petolas, P. Eng. Product Manager METOCEAN Data Systems Ltd. Dartmouth NS B3B 1R9 Canada

  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 DBCP Technical Workshop 2002

  3. 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 DBCP Technical Workshop 2002

  4. Overview of Iridium System DBCP Technical Workshop 2002

  5. 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 DBCP Technical Workshop 2002

  6. Block Diagram of WOCE/BP/Iridium Buoy DBCP Technical Workshop 2002

  7. Iridium 9500 Data Modem data rate is 2400 bits per second. Direct digital connection between buoy and METOCEAN via satellite network System Components: Data MODEM DBCP Technical Workshop 2002

  8. 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 DBCP Technical Workshop 2002

  9. 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 DBCP Technical Workshop 2002

  10. 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 DBCP Technical Workshop 2002

  11. 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! DBCP Technical Workshop 2002

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  17. Deployment in Bering Sea DBCP Technical Workshop 2002

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  19. 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 DBCP Technical Workshop 2002

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