The Ability of a RADGPS to Provide the Accuracy and lntegrity Required for En-route Navigation

Richard Farnworth, Stuart Jolley, Andrew Lovett

Abstract:	A satellite navigation system providing a primary means of en-route navigation will have to meet exacting accuracy, availability, integrity and continuity of service requirements. The UK National Air TrafIic Services in collaboration with the Racal Group, Roke Manor Research and Siemens Plessey Systems have set up a trial to investigate the use of a satellite navigation system for providing en-route navigation in the future. The GPS system and a network of regional monitor stations have been used to investigate the provision of differential corrections and timely integrity warnings to aircraft and air trafIic control facilities. Integrity data and pseudorange corrections are derived from a number of Racal Skyfix reference stations located in and around the UK. The data is uplinked to a suitably equipped British Airways Boeing 767 using the high integrity C-Band datalink provided by the Siemens Plessey MLS at Heathrow Airport. The data is also transferred to a NATS facility to allow system monitoring to be performed so that Air Traffic Controllers can be made aware of navigation system outages. Integrity and availability cannot be demonstrated by the use of flight trials so a Hazard Analysis has been performed to identify the levels achievable with currently available technology. The levels of augmentation and redundancy needed to meet the integrity and availability requirements can then be determined.
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:	671 - 676
Cite this article:	Farnworth, Richard, Jolley, Stuart, Lovett, Andrew, "The Ability of a RADGPS to Provide the Accuracy and lntegrity Required for En-route Navigation," 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. 671-676.
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