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Seismic Instrumentation Technology Symposium

Seismic Instrumentation Technology Symposium. Communications - Leveraging Existing Infrastructures with Iridium RUDICS and SBD Derek Inglis. June 16-17 2011. Background in Seismic Telemetry. IRIS/Passcal – RT130 / Argos - Quanterra Q330 / Iridium. Seismic and GPS data from

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Seismic Instrumentation Technology Symposium

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  1. Seismic Instrumentation Technology Symposium Communications - Leveraging Existing Infrastructures with Iridium RUDICS and SBD Derek Inglis June 16-17 2011

  2. Background in Seismic Telemetry IRIS/Passcal – RT130 / Argos - Quanterra Q330 / Iridium Seismic and GPS data from remote polar regions

  3. XI-100 and XI-202

  4. Satellite Telemetry Systems Good choice for seismic monitoring • Disaster ready, don’t rely on cellular or landlines • Will work in areas where there is no other infrastructure (extreme regions) • Costs are coming down (slowly) • Geostationary Systems • Low Earth Orbiters (LEO’s)

  5. GEO/LEO • Geostationary Satellite systems • Track the same positions on the earth • Large orbits • Usually directional antennas (VSAT) • Polar Orbiting satellite systems • Orbit North to South • Smaller orbits • Can use omnidirectional antennas

  6. Satellite Systems Argos Inmarsat GOES MSAT Orbcomm Iridium VSAT Globalstar

  7. Satellite systems available

  8. Iridium overview • Designed as a phone system: 2-way, real-time • 24/7 availability, true global coverage • 66 satellites • Inter-satellite links pass traffic to ground station • Basic data rate 2.4kbps • Various modes of access • Dial-up (better for larger file sizes) • Short Burst Data, SBD (up to 2 kbyte per message) • RUDICS

  9. Cross-linked satellites

  10. XI-100 • Short Burst Data + RUDICS • Can connect directly to a Q330 via IP or serial port • External sensor port

  11. XI-100 Functional Diagram

  12. XI-100

  13. Cold Temperatures • Original A3LA modems spec’d to -20C • Newer 9522B’s spec’d to -30C • Need to assist modems by adding heater circuits

  14. Customization of Iridium modems • Internal Heaters for cold temperature • Tested to -70C Confidential Information - Xeos Technologies Inc. - NOT FOR DISTRIBUTION

  15. Iridium RUDICS Benefit over non-rudics CSD type calls • Allow for TCP/IP and UDP connectivity • More reliable connection • Slightly better transmission rates • Eliminate modem to modem • Least expensive data cost per KB

  16. RUDICS system • Consists of a ‘Tunnel’ server application • Remote Seismic monitor connected to an XI-100

  17. Rudics problems Buffering data over a very slow connection - We overcame this on the firmware side by buffering data in flash memory TCP/IP Stack on a low power, low memory device - We stripped down the stack to the bare essentials to make it work within the confines of the hardwareRUDICS drops - We overcame these by implementing a handshake system between the XI and the tunnel to detect drops and reestablish the connection.  We also discovered an issue with stop bits that seemed to impact RUDICS drops.

  18. XI-202 (coming soon!) • Smaller, lower cost • SBD only • Status of Health (SOH) message and more • GPS, accelerometer (motion and tilt) • 8 MB flash memory • External sensors Inputs • External Inputs/Outputs

  19. XI-202 • Monitor multiple battery voltages • Collect, store, transmit small data samples • Send and receive commands from equipment • External Reset other equipment (kickstart)

  20. Polarsat – beyond Geostationary coverage 29

  21. Telesat’s Global Infrastructure • Telesat is now the fourth largest Fixed Satellite Service (FSS) operator in the world providing reliable and secure satellite-delivered communications solutions to broadcast, telecom, corporate and government customers

  22. The need for circumpolar coverage • Meteorological • Continuous Circumpolar Coverage 100% at 60° North and above for weather monitoring • Communications • Current Area of Interest outlined in blue as defined by the Canadian Space Agency • Coverage can be expanded to include other arctic regions • Satellite could also include: • aviation communications • navigation augmentation,

  23. The Telesat Approach to Polar Constellation • A two satellite constellation can meet these requirements for continuous weather monitoring and communications • Satellite design life of 15 years in a space environment similar to geostationary orbit where we currently operate our 13 satellites • A private public partnership model based on payment of services over the period in which these services are provided • Commercial approach to the development, procurement and operation of the satellite system • Can provide over ten hours of broadband communications service to the south pole region Comparison of Telesat proposed orbit and geostationary orbit. jrigley@telesat.com

  24. Thank-You

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