Differential GPS - Quality Control Issues

Kumar Babu and Paul K. Dano

Abstract:	Sub meter accuracy is currently possible with C/A differential GPS systems. The accuracy statistics that GPS vendors provide are based on sampling of data over a limited interval of time and do not provide any information to the user regarding instant to instant performance. However, for various applications like marine and land surveying, one of the problems with differential GPS is the lack of a mechanism for the user to determke how accurately the system is doing at a given time. Various effects like multi-path, satellite obscuration and thus poor geometry and differential correction dropout can cause a loss of accuracy. Very often the user does not realizetillmuch later that the navigakm au3cacy was degradedcillmuchlater.This resultsinalot of wasted efht and considerable inconvenience. The authors discuss issues involvedinprovldingareaso&leconfidence level to the user and c&r some recommendations on how to improve the qualityoftheDGPSsystem.The+.&&l;~ arecumntl inthepcocessofb inthelatest E Y elNortee@pmeut.T ough the authors focus primarll peminhgtocivilian ADGPSsystems, e onquality issues many ofthe commentsareequaUyapplicable to P-code systems.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	1267 - 1271
Cite this article:	Babu, Kumar, Dano, Paul K., "Differential GPS - Quality Control Issues," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 1267-1271.
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