Aircraft Approach and Landing Studies with the Global Positioning System

Douglas Hardwick and Jeffrey Liu

Abstract:	The National Research Council of Canada (NRC) is conducting a study of the accuracy of CIA code Differential GPS (DGPS) for Category I landings. In order to strengthen the existing landing data base, DGPS approach and landing data were collected at Resolute and Inuvik in the Canadian Arctic and at St. John’s, Newfoundland, using the NRC Convair 580 aircraft. Data were collected for a total of 56 landings, 21 of which were flown on full DGPS guidance. These tests were carried out over a period of 2% years, during which time the DGPS receiver suite evolved from C/A code only, to single frequency NovAtel GPSCardrM with C/A code and carrier phase and in the Saint John’s tests, dual frequency Ashtech Z-12 receivers were flown with the NovAtels. Kinematic carrier phase with ambiguity initialization was used as the basic ground truth to estimate the accuracy of real time C/A code DGPS, which was the system under test. Several C/A code data processing techniques, namely C/A code differential positioning, carrier phase smoothing of code positioning and single point positioning with precise orbits and clocks, were compared. Carrier phase solutions from the Novatel and Ashtech receivers were also compared.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1393 - 1401
Cite this article:	Hardwick, Douglas, Liu, Jeffrey, "Aircraft Approach and Landing Studies with the Global Positioning System," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1393-1401.
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