External Ionospheric Constraints for Improved PPP-AR Initialisation and a Generalised Local Augmentation Concept

Paul Collins, Francois Lahaye and Sunil Bisnath

Abstract:	Constraining the ionosphere delay is the key step in rapid ambiguity resolution. Previous work has shown how PPP-AR re-convergence can be achieved by constraining internal ionosphere estimates. That method is extended here to permit rapid convergence using external ionospheric estimates from other PPP-AR solutions. Subject to the use of good orbits and correctly weighted observations, cm-precise (slant, integer biased) ionospheric delays can be used to initialise PPP-AR solutions within several seconds. Kinematic solutions have 1cm RMS error with respect to RTK for latitude and longitude and 4-5cm RMS error for height. In principle a local reference network of static stations could be replaced with local PPP-AR users.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	3055 - 3065
Cite this article:	Collins, Paul, Lahaye, Francois, Bisnath, Sunil, "External Ionospheric Constraints for Improved PPP-AR Initialisation and a Generalised Local Augmentation Concept," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 3055-3065.
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