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Subelement P
Satellite
Section 95
Low Earth Orbit Systems
What is the orbiting altitude of the Iridium satellite communications system?
  • 22,184 miles.
  • 11,492 miles.
  • 4,686 miles.
  • Correct Answer
    485 miles.
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What frequency band is used by the Iridium system for telephone and messaging?
  • 965 - 985 MHz.
  • Correct Answer
    1616 -1626 MHz.
  • 1855 -1895 MHz.
  • 2415 - 2435 MHz.
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What services are provided by the Iridium system?
  • Analog voice and Data at 4.8 kbps.
  • Digital voice and Data at 9.6 kbps.
  • Correct Answer
    Digital voice and Data at 2.4 kbps.
  • Analog voice and Data at 9.6 kbps.
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Which of the following statements about the Iridium system is true?
  • Correct Answer
    There are 48 spot beams per satellite with a footprint of 30 miles in diameter.
  • There are 48 satellites in orbit in 4 orbital planes.
  • The inclination of the orbital planes is 55 degrees.
  • The orbital period is approximately 85 minutes.
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What is the main function of the COSPAS-SARSAT satellite system?
  • Monitor 121.5 MHz for voice distress calls.
  • Correct Answer
    Monitor 406 MHz for distress calls from EPIRBs.
  • Monitor 1635 MHz for coded distress calls.
  • Monitor 2197.5 kHz for hexadecimal coded DSC distress messages.
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How does the COSPAS-SARSAT satellite system determine the position of a ship in distress?
  • Correct Answer
    By measuring the Doppler shift of the 406 MHz signal taken at several different points in its orbit.
  • The EPIRB always transmits its position which is relayed by the satellite to the Local User Terminal.
  • It takes two different satellites to establish an accurate position.
  • None of the above.
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