Which of the following statements is correct regarding the accuracy that can be obtained with the LAAS (Local Area Augmentation System) of the satellite navigation system NAVSTAR/GPS?
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A
A LAAS cannot correct for satellite timing and orbital position error.
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B
A LAAS corrects the position of the aircraft by relaying the information via a geostationary satellite.
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C
The increase in accuracy of position fixes is independent of the aircraft position in relation to the LAAS ground reference station.
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D
The closer the receiver is to a LAAS ground reference station, the more accurate is the aircraft position fix.
The local-area augmentation system (LAAS) is an all-weather aircraft landing system based on real-time differential correction of the GPS signal.
Local reference receivers located around the airport send measurements to a nearby processing unit, which use these measurements to formulate differential corrections for the GPS satellites being tracked by the reference receivers.
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The closer the aircraft receiver is to the Ground Facility the less potential for errors in the signal as the signals from the satellites will travel through similar atmospheric conditions.
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