Dilution Of Precision Revisited

Dennis Milbert

Peer Reviewed

Abstract: Measured vertical to horizontal positional error ratios from FAA data show behavior inconsistent with the random error propagation model of DOP. The current almanac gives a mean VDOP/HDOP ratio of 1.474, which does not match the recent measured error ratio. A new measure, Error Scale Factor (ESF), is defined which scales systematic error sources and which is analogous to DOP. The ESF is further refined to account for differing ionosphere and troposphere mapping functions. A Monte Carlo simulation illustrates the transfer of the systematic atmospheric residual errors into position. A hybrid error model is constructed which is partially successful in quantifying both random and systematic error sources.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 55, Number 1
Pages: 67 - 81
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