Iridium communications for data buoy applications Iridium overview



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tarix06.03.2018
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Iridium communications for data buoy applications


  • Iridium overview

  • SAMS polar experience with Iridium

  • Recent deployments

  • Future plans

    • SAMS
    • DBCP


Satcom systems available globally to platform operators



Low Earth Orbit and Geostationary Earth Orbit Field of View for LEO (Iridium) and GEO (Inmarsat)



Typical LEO polar orbit



Satcom systems available globally to platform operators



Satcom systems available to POLAR platform operators

  • Argos: 6 sats, 400 bits/s (will increase)

  • Iridium: 66 sats, 2400 bits/s (will increase)



Iridium overview



Iridium traffic



Current constellation



Replenishment plans



Iridium ballpark costs

  • Dial-up + SBD modem: $1000

  • SBD-only modem: $400

  • Monthly fee: $14 - $30

  • Call costs: ~$1 per minute

    • $0.1 per kbyte for files > few kbyte
  • Data costs: ~$1.50 per kbyte



SAMS activities in polar science

  • Role of sea ice in climate change

  • Several polar deployments

  • Use of Iridium, Orbcomm and Argos

  • EU GreenIce project

  • CryoSat validation

  • Opportunities during IPY 2007-8

  • Development of new platforms for flux, hydrographic and meteo measurements



Global oceanic heat flux







Temperature record



Battery voltage



Pressure data from co-sited SVPB



Transfer times for 37kbyte file



New suitcase buoys: GPS only



9601 (‘Taladega’) SBD modem







SAMS future plans: Ice platforms for IPY

  • Surface meteorology

  • Net surface radiation fluxes

    • Kipp & Zonen CNR net radiometers
  • Heat flux through sea ice

  • Ice mass balance

  • Boundary layer currents

  • Sub-ice CTDs

  • GPS

  • Web cam

  • Iridium and Argos comms



SAMS future plans: Solar powered Iridium drifters

  • Transparent hulls from Technocean

  • Solar panel equatorial plane

  • SVPB sensor fit

  • Li-ion batteries

  • Iridium 9601 + GPS

  • Extensive diagnostics

  • Participation in DBCP Iridium pilot programme….







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