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Satelite M2M

Satellite M2M / IOT

Orbcomm satelliteThrough its partner network EWI has access to a network of low Earth orbit (LEO) satellites that provide worldwide coverage.  This enables EWI to reach GEO areas that are out of the reach of traditional tier 1 radio masts. The typical application that this would be used for with our security layer are Ships, fleet vehicles and high valued assets that reach land areas not covered by GSM.

Each satellite is equipped with a VHF and Ultra High Frequency, or UHF, communication payload capable of operation in the 137.0-150.05 MHz and the 400.075-400.125 MHz bands. The use of the system uplink (Earth-to-space) spectrum is managed by an on-board computer that employs the ORBCOMM-pioneered Dynamic Channel Activity Assignment System, or DCAAS. DCAAS continuously scans the authorized spectrum, identifies frequencies in use by other users of the frequency band and assigns subscriber communication uplink channels to minimize interference. DCAAS changes the uplink frequency at least every 15 seconds, which allows our system to coexist with the current users of the VHF frequency band, and limits interference to acceptable levels.  The gateway earth stations and the subscriber communicators communicate with the satellites in the same VHF band, thus eliminating the design complexity, as well as the associated bulk, power and cost of supporting multiple communication equipment on a single satellite. Our satellites also contain packet-routing communications capability, including a limited store-and-forward capability.

Sun-Nadir Steered Configuration

  • Vertical disk-shaped body with nadir-oriented quad helix antennas
  • Single-axis, dual panel solar array deployed normal to body

Vital Statistics

  • 92 pounds
  • 41” diameter x 6.5” high (stowed configuration)
  • 170” long x 88” high (antenna and solar array deployed)

Bus Subsystem

  • EWI Fingerprinting layer for peer to peer connectivity and ghost protocol
  • Peak power tracking with GaAs solar array
  • Wheel-augmented gravity gradient / magnetic 3-axis ACS
  • GPS state vector determination
  • Cold gas propellant / differential drag stationkeeping
  • Central flight computer for data / command storage

 

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