Iridium

Iridium Satellite LCC is the only mobile satellite service (MSS) company offering coverage over the entire globe. The Iridium constellation of low-earth orbiting (LEO), cross-linked satellites provide critical voice and data services for areas not served by terrestrial communication networks.

Iridium has launched a major development program for its next-generation satellite constellation, Iridium NEXT, which will result in continued and new Iridium MSS offerings.

The Iridium constellation of 66 cross-linked Low Earth Orbit (LEO) satellites, plus several in-orbit spares, means truly global coverage and real mobility everywhere.

The network is considered a meshed constellation of interconnected, cross-linked satellites so that each satellite “talks” with the other nearby satellites in adjacent orbits.

Unique to Iridium, this architecture provides inherent advantages in performance and reliability over other mobile satellite services providers.

If a single satellite is temporarily unavailable due to technical issues or planned maintenance:

  • The outage will be localized to the user or region.
  • Inter Satellite Link (ISL) traffic can be routed within the constellation until a spare is moved into place.
  • Back-up Earth Terminals in Alaska will allow traffic to be grounded in multiple locations.
  • The cross-linked satellite architecture permits Iridium to operate with increased reliability due to the inherent meshed architecture involving both celestial and terrestrial infrastructure.Similarly, should one link in this network fail, the system can recognize and quickly respond by providing alternative routing paths for the communication to reach the end users.
  • The Iridium satellites have multiple layers of on-board subsystem redundancy for critical components, and an on-board fault detection system allowing for safe and quick mitigation of anomalies that may occur.
  • The satellites are programmable, enabling ground engineers to upload instructions and software as needed to keep the satellites functioning at high level performance and reliability levels.
  • The in-orbit spares can be quickly repositioned and activated, as needed.
  • The low-Earth orbit provides a shorter transmission path with less signal attenuation. This permits truly mobile user equipment with smaller antennas that require no mechanical stabilization or re-pointing to keep lock on the satellite signals.


For more information on IRIDIUM products Contact AA Radio