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Eliminating obliquity error from the estimation of ionospheric delay ina satellite-based augmentation system

Show simple item record Sparks, Lawrence 2014-01-30T18:03:16Z 2014-01-30T18:03:16Z 2013-04-22
dc.identifier.citation ION Pacific PNT Conference, Honolulu, Hawaii, April 22-25, 2013 en_US
dc.identifier.clearanceno 13-2132
dc.description.abstract Current satellite-based augmentation systems estimate ionospheric delay using algorithms that assume the electron density of the ionosphere is non-negligible only in a thin shell located near the peak of the actual profile. In its initial operating capability, for example, the Wide Area Augmentation System incorporated the thin shell model into an estimation algorithm that calculates vertical delay using a planar fit. Under disturbed conditions or at low latitude where ionospheric structure is complex, however, the thin shell approximation can serve as a significant source of estimation error. A recent upgrade of the system replaced the planar fit algorithm with an algorithm based upon kriging. The upgrade owes its success, in part, to the ability of kriging to mitigate the error due to this approximation. Previously, alternative delay estimation algorithms have been proposed that eliminate the need for invoking the thin shell model altogether. Prior analyses have compared the accuracy achieved by these methods to the accuracy achieved by the planar fit algorithm. This paper extends these analyses to include a comparison with the accuracy achieved by kriging. It concludes by examining how a satellite-based augmentation system might be implemented without recourse to the thin shell approximation. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2013 en_US
dc.subject global positioning system (GPS) en_US
dc.subject Wide Area Augmentation System (WAAS) en_US
dc.subject ionosphere en_US
dc.subject delay estimation en_US
dc.subject thin shell model en_US
dc.title Eliminating obliquity error from the estimation of ionospheric delay ina satellite-based augmentation system en_US
dc.type Preprint en_US

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