THE INSTITUTE'S PROFESSIONAL FORUM ON THE CALCULATION OF REPEATABLE ACCURACY WITH SPECIAL REFERENCE TO GPS

Borje Forssell

Peer Reviewed

Abstract:	A general formula for the repeatable horizontal accuracy of a navigation system is derived, and the influence of biases is discussed. The result is simplified for the GPS case of directionally independent random position errors with zero bias. It is shown that in such a case, the (global) mean square error, (V2 dRMS)2, of the repeatable position error is twice that of the absolute error. The conclusion is that the 95 percent repeatable accuracy of GPS with Selective Availability (SA) is about 140 m, not 100 m as stated in the Federal Radionavigation Plan.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 39, Number 1
Pages:	133 - 136
Cite this article:	Forssell, Borje, "THE INSTITUTE'S PROFESSIONAL FORUM ON THE CALCULATION OF REPEATABLE ACCURACY WITH SPECIAL REFERENCE TO GPS", NAVIGATION: Journal of The Institute of Navigation, Vol. 39, No. 1, Spring 1992, pp. 133-136.
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