New User Equivalent Range Error (UERE) Budget for the Modernized Navstar Global Positioning System (GPS)

Karl Kovach

Abstract:	This paper describes a new User Equivalent Range Error (UERE) budget for the Modernized Global Positioning System (GPS). This new UERE budget is a statistical description of the pseudorange accuracies one can expect to see when tracking the Navstar satellites in the not too distant future. The new UERE budget actually comprises individual UERE budgets for each unique combination of satellite signals tracked (i.e., L1 P(Y)-Code, L2 P(Y)-Code, L1 C/A-Code, and L2 C/A-Code) and each signal tracking environment (i.e., air, ground, and space). Only a few of the UERE budget components in this paper are new. Most of the UERE budget components have been previously described elsewhere, particularly those related to high-end GPS receivers operating in the air environment. This paper brings all of those individual UERE budget components together for the first time in one place, harmonizes them, and places them into a unified UERE budget structure. The new UERE budget in this paper serves as a baseline for assessing the pseudorange accuracy impacts resulting from GPS modernization efforts; specifically M-Code for military users and L5 for civil users. Assuming M-Code and L5 do no more than maintain the status quo, then this UERE budget will apply to the Modernized GPS as well.
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	550 - 573
Cite this article:	Kovach, Karl, "New User Equivalent Range Error (UERE) Budget for the Modernized Navstar Global Positioning System (GPS)," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 550-573.
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