Investigation of the Potential Application of GPS for Precision Approaches

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Abstract
This paper investigates the potential of using GPS for precision approach landing operations. The issues addressed are accuracy, integrity, and coverage reliability. The results of the investigation show that GPS performance, as specified by the GPS Joint Program Office, does not presently satisfy precision approach requirements as specified by the International Civil Aviation Organization. Although the horizontal accuracy of GPS is within the requirement specified for a precision approach to 200 ft altitude above the runway, it is shown that GPS, even when operating in a differential mode, does not achieve the required vertical accuracy. Integrity and coverage reliability are also shown to require further improvement for GPS to be considered for use as a precision approach system.

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