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Subel. I
6 questions
Subelement I
Inmarsat Equip. & Comms:
Section 63
Iridium General System Operations
Iridium satellites are in what sort of orbits?
  • 4 satellites in near polar orbit to provide true global coverage.
  • 66 satellites in geo-stationary orbit to provide true global coverage.
  • Correct Answer
    66 satellites in near polar orbit to provide true global coverage.
  • 6 geo-stationary satellites providing coverage between 70N & 70S degrees latitude.
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How are Iridium antennas tracking the satellites?
  • They are flat-panel arrays that must be oriented to the satellites in their near-polar orbit.
  • They are directional dish antennas that must track the satellites as they pass overhead.
  • They are omni-directional dish antennas that locate the satellites as they pass overhead.
  • Correct Answer
    They are omni-directional antennas that receive signal as various satellites pass overhead.
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The Iridium terminal typically displays what status indicators?
  • Correct Answer
    Power, GPS, signal strength, data and handset port conditions.
  • Power, GPS, signal strength and satellite tracking azimuth and elevation.
  • GPS satellites overhead, conditions of data and handset ports and data throughput.
  • Geo-stationary satellite status, signal strength and data and handset port conditions.
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How are Iridium calls routed through the satellite system?
  • The satellites store the calls and forwards them to ground stations when they are in view.
  • Correct Answer
    The satellites are in view of one another and traffic can swiftly be passed to a ground station.
  • The satellites are geo-stationary and route the traffic immediately to the ground stations.
  • The satellites in polar orbits pass traffic to geo-stationary satellites and then to ground stations.
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Which of the following statements concerning Iridium satellites is true?
  • They are in a geo-stationary orbit, in order to provide true global coverage.
  • Correct Answer
    They provide coverage to vessels in all of the world's navigable waters including polar regions.
  • They are in an equatorial orbit, in order to provide true global coverage.
  • Vessels sailing in equatorial waters are able to use only one satellite, whereas other vessels are able to choose between at least two satellites.
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What is the primary purpose of an Iridium LES?
  • The LES is required for ship-ship Inmarsat communications, ship-shore communications are handled by terrestrial Coast Radio Stations.
  • The LES monitors all operations of the satellite and assigns channels and frequencies to the vessel.
  • Correct Answer
    The LES makes the satellite connection between the vessel and the requested shore destination.
  • The LES is dedicated only to processing all vessel Distress priority calls.
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