Author(s): James L. Farrell
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 48, Number 3
Pages: 195 - 204
Cite this article: Farrell, James L., "GDOP AND RAIM IN DIFFERENTIAL OPERATION", NAVIGATION, Journal of The Institute of Navigation, Vol. 48, No. 3, Fall 2001, pp. 195-204.
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Abstract: Familiar matrix forms customarily used in evaluating the performance of satellite geometries for receiver autonomous integrity monitoring (RAIM) need modification for differential applications. When positions are determined through differencing across satellites, usage of a common space vehicle (SV) produces correlations. Neglecting correlations between differenced observation errors would produce inconsistent dilution of precision (DOP) values and imprecise integrity performance. Rigorous analysis of correlation effects has produced very surprising matrix forms that have not appeared previously. These new forms have led to new results, presented herein with interpretations and operational ramifications.