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Design of a Low-cost Acoustic Modem for Moored Oceanographic Applications

Design of a Low-cost Acoustic Modem for Moored Oceanographic Applications. Bridget Benson, Grace Chang, Derek Manov, Brian Graham, Ryan Kastner University of California Santa Barbara WUWNet Presentation September 25 th 2006. Outline. Motivation Requirements Design Experimental Results

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Design of a Low-cost Acoustic Modem for Moored Oceanographic Applications

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  1. Design of a Low-cost Acoustic Modem for Moored Oceanographic Applications Bridget Benson, Grace Chang, Derek Manov, Brian Graham, Ryan Kastner University of California Santa Barbara WUWNet Presentation September 25th 2006

  2. Outline • Motivation • Requirements • Design • Experimental Results • Meeting the Requirements for the SB CHARM • Future Work

  3. Motivation • To understand the ocean we must be able to observe large regions for long periods of time • Such data could help predict earthquakes, tsunamis, or spread of a toxic algal bloom • Platforms to measure large sets of data for long periods have been and are being established

  4. Cabled Observatories Martha’s Vineyard Coastal Observatory LEO NEPTUNE

  5. Moorings • MBARI Ocean Observing System (MOOS) • EOM cable in this mooring system parted in a storm on December 15, 2002.

  6. Mooring Modem Requirements • Sensor to Modem Interfacing • Packaging • Power • Low Cost • Data Transmission Range • Data Transmission Rate • Oceanic Motion Resistance • Acoustic Interference

  7. Mooring Modem Design Transmitter: Receiver:

  8. Mooring Modem Specifications • Power Supply: 12 V • Sampling Frequency: 8 kHz • Data Rate: 80 bps • Carrier Frequency: 50 kHz • Frequency Separation: 320 Hz • Transducer Beam Width: 20o

  9. Experimental Set-Up

  10. Experimental Results

  11. Experimental Results

  12. SB CHARM

  13. Meeting the Requirements for the SB CHARM

  14. Future Work • Determine actual power consumption and battery life of mooring modems • Reduce size of the Mooring Modem design and waterproof the electronics • Implement error correcting codes to reduce the BER • Determine how to network the Mooring Modems • Interface the Mooring Modem with oceanographic sensors using RS-232 protocol • Test the Mooring Modem on the SB CHARM at depths 0, 4, 10, and 22m

  15. Acknowledgements • W.M Keck Foundation • Hua Lee and Ronald Iltis

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