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Drifting Buoy Update: WOTAN and Iridium

Drifting Buoy Update: WOTAN and Iridium. Iridium Drifter. Bernie Petolas, P.Eng. Product Manager, Buoys and Platforms Tony Chedrawy, MBA, P.Eng. VP Sales and Marketing. WOTAN SVP BP WSD. Introduction. WOTAN Buoy History and Development WOTAN Buoy Design and Specifications

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Drifting Buoy Update: WOTAN and Iridium

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  1. Drifting Buoy Update: WOTAN and Iridium Iridium Drifter Bernie Petolas, P.Eng. Product Manager, Buoys and Platforms Tony Chedrawy, MBA, P.Eng. VP Sales and Marketing

  2. WOTAN SVP BP WSD DBCP Technical Workshop 2003

  3. Introduction • WOTAN Buoy History and Development • WOTAN Buoy Design and Specifications • WOTAN Buoy Performance • Conclusion DBCP Technical Workshop 2003

  4. WOTAN Buoy History • WOTAN – Wind Observation Through Ambient Noise • METOCEAN’s electronics, hydrophone and pre-amplifier design developed in 1988 • Drifting buoy design integration in 1992 • Vagle Algorithm focusing on sound intensity levels between 2 kHz and 8 kHz DBCP Technical Workshop 2003

  5. WOTAN Development • Full sensor suite and data processing integrated to METOCEAN SVP drifters in 1996 • Incorporation of Pierre Blouch’s algorithm in 2003. Average sound intensity level between 2 kHz and at 6 kHz, standard deviation between 2 kHz and at 8 kHz • Transmission of data across the full sound spectrum • Over 400 WOTAN drifters deployed !! DBCP Technical Workshop 2003

  6. WOTAN Design METOCEAN WOTAN DRIFTER • 16 inch diameter hull • Argos position • SST - Sea surface temperature • BP - Barometric Pressure • Drogue On/Off Sensor • Acoustic wind speed • Internal compass and wind vane for direction • Drogues - 644 cm by 92 cm centered at 15 meters • Argos M1 or M2 Data Transmit Format DBCP Technical Workshop 2003

  7. Hydrophone Drifter hull WOTAN Design Barometer port Fixed vane 10 metres belowthe sea surface Drogue DBCP Technical Workshop 2003

  8. WOTAN Performance Data courtesy of NOAA, UK Met Office, Meteo France, AOML, NDBC, NAVOCEANO, KORDI, Environment Canada, Australian Bureau of Meteorology DBCP Technical Workshop 2003

  9. WOTAN Performance DBCP Technical Workshop 2003

  10. WOTAN Performance DBCP Technical Workshop 2003

  11. WOTAN Performance DBCP Technical Workshop 2003

  12. WOTAN Performance DBCP Technical Workshop 2003

  13. WOTAN Conclusion • Minimum lifetime of one year • Proven Air Deployment Reliability • Proven Performance in Hurricane (s) • Low POWER Consumption DBCP Technical Workshop 2003

  14. Iridium DBCP Technical Workshop 2003

  15. Iridium Introduction • Iridium data services overview • METOCEAN’s Iridium Communication Infrastructure • Drifting buoy deployed in Bering Sea • Iridium costs • Conclusions DBCP Technical Workshop 2003

  16. Overview of Iridium System DBCP Technical Workshop 2003

  17. SBD Service Overview Internet Email Iridium Gateway Value Added Reseller Host System SBD Network Equipment End User Applications DBCP Technical Workshop 2003

  18. SBD Service Overview • An efficient packet-based service for frequent short data transmissions • Service supports 1960 bytes Mobile Originated and 1890 bytes Mobile Terminated • System interfaces: • Device: Extended AT command set • Gateway: Email - user data is sent in attachments • Pricing plans based on byte usage not time DBCP Technical Workshop 2003

  19. 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 2003

  20. 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 2003

  21. 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 2003

  22. Drifting Buoy Deployment • 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 2003

  23. Deployment in Bering Sea NDBC Buoy 46001 DBCP Technical Workshop 2003

  24. Buoy Data DBCP Technical Workshop 2003

  25. Cost Comparison (US$) DBCP Technical Workshop 2003

  26. Iridium Conclusion • 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 2003

  27. Thank You ! DBCP Technical Workshop 2003

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