DYNAMIC UPLOADING FOR GPS ACCURACY

Kenneth Brown, William Mathon, Arthur Dorsey, and Margaret Larezos

Peer Reviewed

Abstract:	As part of the GPS Accuracy Improvement Initiative (AU), tuning and accuracy issues were investigated for the future AII environment of single-partition filtering and added Monitor Stations (MSs) for the GPS Operational Control Segment (OCS). Because accuracy to users depends on age of data, the study also addressed uploading of navigation data to the satellite vehicles (SVs), considering increased scheduled uploads; pure %ontingency” uploads (invoked dynamically when an SV exceeds an error threshold); and mixed dynamic methods in which both scheduled and contingency uploads exist, and even scheduled uploads are enabled dynamically. A system tradeoff plot of user ranging error (URE) vs. uploads per day is used to illustrate the choices available. Results show how improved uploading allows substantial error reductions-larger than those due to retuning, added MSs, and single-partition filtering combined. Moreover, various “dynamic” or accuracy- based uploading approaches can dramatically reduce the number of uploads needed to achieve a given accuracy.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 45, Number 1
Pages:	17 - 30
Cite this article:	Brown, Kenneth, Mathon, William, Dorsey, Arthur, Larezos, Margaret, "DYNAMIC UPLOADING FOR GPS ACCURACY", NAVIGATION: Journal of The Institute of Navigation, Vol. 45, No. 1, Spring 1998, pp. 17-30.
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