A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM

Juan Blanch, Todd Walter, Per Enge

Abstract:	Dual frequency Absolute RAIM has the potential of providing global coverage of vertical guidance. However, a constellation of thirty or more satellites will be necessary to achieve this goal. In this work, a hedge for Absolute RAIM users at a low cost for the integrity provider is investigated. The concept relies on a simple real time ground monitoring algorithm and on the generalization of the ARAIM algorithms. The ground monitoring described here consists of a simple snapshot algorithm where all unknowns are estimated simultaneously – although exploiting explicitly the ARAIM assumptions. For each satellite, a bound on the worst case error is broadcast. This error bound is integrated by the user in the ARAIM solution. This is achieved by generalizing the Multiple Hypothesis Solution Separation ARAIM algorithm. Preliminary performance results are shown for a reference station network in North America as a function of the reference network and the constellation. Finally, the importance of the ARAIM assumptions and the necessity of offline monitoring are stressed.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1911 - 1917
Cite this article:	Blanch, Juan, Walter, Todd, Enge, Per, "A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1911-1917.
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