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Subelement C

Satellite Systems:

Section 28

GPS:

What is the usual arrangement of GPS satellites?

  • 18 satellites in 3 orbital planes, 6 satellites in each plane, 23,400 km altitude and 55 degrees inclination.
  • Correct Answer
    24 satellites in 6 orbital planes, 4 satellites in each plane, 20,200 km altitude and 55 degrees inclination.
  • 30 satellites in 5 orbital planes, 6 satellites in each plane, 20,200 km altitude and 60 degrees inclination.
  • 36 satellites in 6 orbital planes, 6 satellites in each plane, 23,600 km altitude and 60 degrees inclination.
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What is the purpose of the Differential GPS system and how does it work?

  • To measure the difference between L-1 and L-2 signals and transmit the information via the GPS signal.
  • To correct for time errors in the satellites and transmit this information via the GPS signal.
  • Correct Answer
    To correct for various errors using a fixed receiving station which transmits corrections via radio signals.
  • To correct for phase errors between L-1 and L-2 signals and transmit the information via radio beacons.
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How is the GPS usually interconnected with other bridge equipment?

  • Through a 8-bit parallel line network.
  • Through a USB port.
  • Through an Ethernet LAN.
  • Correct Answer
    Through a NMEA-0183 or NMEA-2000 LAN.
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Which of the following statements is true?

  • Correct Answer
    The L2 carrier of 1227.60 MHz is used to measure the ionospheric delay.
  • The L1 carrier of 1650.5 MHz is used to measure the ionospheric delay.
  • The L1 carrier of 1545.22 MHz is used to provide the navigation message.
  • The L2 carrier of 1575.42 MHz is used to provide the navigation message.
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Which of the following best describes the GPS satellite signals transmitted?

  • The L2 carrier at 1650.5 MHz carries the navigation message and the L1 carrier at 1575.42 MHz is used to measure the ionospheric delay.
  • The two carriers are combined in a mixer circuit to develop an intermediate signal which is transmitted.
  • The main carrier of 1650.5 MHz and a sub-carrier of 1575.24 MHz containing the SPS code signals.
  • Correct Answer
    The L1 carrier of 1575.42 MHz carries the navigation message and the SPS code signals and the L2 carrier 1227.60 MHz which is used to measure the ionospheric delay.
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What is the minimum number of satellites that must be received to provide the highest accuracy?

  • Correct Answer
    Four
  • Two
  • Eight
  • Six
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