Two New RAIM Methods Based on the Optimally Weighted Average Solution (OWAS) Concept

Young C. Lee

Peer Reviewed

Abstract: This paper presents two new RAIM methods that achieve higher availability using a weighting concept. Although a recently published method called NIORAIM likewise does this (by applying numerically derived weights to the range measurements), these two new methods use weights analytically derived in the position domain. The first one of these methods, named OWAS-1, works with a single constellation assuming a single fault at a time. The other method, named OWAS-2, works with two independent constellations (e.g., GPS and Galileo) and provides integrity monitoring even in the presence of a common mode fault affecting multiple satellites in either one of the two constellations. OWAS-2 has been motivated by recent interest in possibly providing vertically guided approaches using RAIM when both GPS and Galileo constellations become fully populated with new satellites. The analysis shows that both methods significantly improve availability compared to previously developed methods of their respective kinds.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 54, Number 4
Pages: 333 - 345
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