The Application of Quality Control Methods to Real-Time Differential GPS Navigation

Leonid Sheynblat and G. Jeffrey Geier

Abstract:	Quality Control applied to Navigation System Integrity Monitoring is designed to detect faulty measurement sources before they corrupt solution accuracy. Following a brief review of the theory of quality control methods based upon Weighted Least Squares (WLS) solutions, their application to differential GPS (DGPS) navigation is discussed. Two types of quality control methods are described, classified as active or passive. The active methods are developed to protect the real-time solution from the use of erroneous measurement data, and can result in the rejection of measurement data; passive methods, on the other hand, simply report on the solution accuracy and/or validity, without attempting to edit the measurement data. The advantages and disadvantages of the implementation of either method within a GPS receiver, as a function of its intended application, are reviewed. The paper then focuses on the use of passive methods which have been implemented in Trimble GPS receivers: direct test experience with the quality control features is described. Specifically, their ability to predict solution accuracy and to indicate anomalous behavior is illustrated using real data segments derived using Trimble’s 4000 DS receiver. Finally, conclusions on the utility of the quality control methods for different navigation applications are summarized.
Published in:	Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993) June 21 - 23, 1993 Royal Sonesta Hotel Cambridge, MA
Pages:	647 - 654
Cite this article:	Sheynblat, Leonid, Geier, G. Jeffrey, "The Application of Quality Control Methods to Real-Time Differential GPS Navigation," Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993), Cambridge, MA, June 1993, pp. 647-654.
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