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What is the minimum Ground-Based Augmentation System (GBAS) plan coverage?
  • A
    15 NM from the landing threshold within 35° apart the final approach path and 10° apart between 15 and 20 NM.
  • B
    25 NM from the landing threshold within 45° apart the final approach path and 20° apart between 25 and 20 NM.
  • C
    25 NM from the landing threshold within 35° apart the final approach path and 10° apart between 25 and 30 NM.
  • D
    15 NM from the landing threshold within 45° apart the final approach path and 20° apart between 15 and 20 NM.

Ground-base Augmentation Systems (GBAS)

The basic principle of GBAS is to measure the errors of the GNSS satellite signals and to relay these errors to the user receivers.

The average GBAS coverage must be adequate to provide precise augmentation to an aerodrome terminal area. The approximate coverage of the DGPS antenna is 30 - 40 km. GBAS corrects the GPS signal to approx.+-4 m vertically and +-16 m horizontally.

GBAS coverage from the leading threshold to enable precise approach navigation is:

  • +-35º along the centreline within 15 NM;

  • +-10º between 15 NM and 20 NM.

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