Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation

J. Seo, T. Walter, P. Enge

Abstract:	A Global Positioning System (GPS) receiver may lose carrier tracking lock to the GPS signal under deep and frequent fades due to ionospheric scintillation. The frequent loss of lock observed during a strong scintillation period from the past solar maximum can significantly reduce GPS aviation availability. However, the frequency diversity (L1 and L5 frequencies) from the future GPS is expected to mitigate scintillation impact on GPS aviation. In order to assess its mitigation effectiveness, we propose a way to generate correlated fading processes based on our definition of a correlation coefficient between fading channels. Using the correlated fading process model that we propose, navigation availability of Localizer Performance with Vertical guidance (LPV)-200 during severe scintillation is parametrically studied. We then present results showing that high navigation availability is attainable if a receiver reacquires the lost channel within 1 or 2 seconds. Based on this result, we propose a new performance requirement for the future dual frequency GPS aviation receiver performance standards to guarantee high navigation availability during strong scintillation.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	1216 - 1224
Cite this article:	Seo, J., Walter, T., Enge, P., "Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 1216-1224.
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