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An Improved Ionospheric Correction Method for Wide-Area Augmentation Systems

Show simple item record Mannucci, A. J. en_US 2004-10-03T05:12:49Z 2004-10-03T05:12:49Z 1995-09 en_US
dc.identifier.citation Palm Springs, California en_US
dc.identifier.clearanceno 95-1138 en_US
dc.description.abstract A powerful approach for generating ionospheric corrections in wide area differential GPS applications has been developed, that can be applied to the Federal Aviation Administration's Wide Area Augmentation System (WAAS). This approach has been used to support ionospheric calibration for NASA's Deep Space Network and will be supporting real-time operations for global ionospheric specification and, possibly, single-frequency satellite altimeter calibration. It is a real-time, grid-based technique relying on a computationally efficient Kalman-type filter to produce accurate, smoothly varying ionospheric correction maps over the coverage area. Formal error maps are also computed, providing vertical delay errors over the WAAS grid, which are useful in integrity monitoring. This solution to the ionospheric correction problem is self-calibrating, since GPS transmitter inter-frequency biases are obtained as a by-product of the mapping procedure. This contrasts with other techniques in which bias values must be provided from some additional source. en_US
dc.format.extent 486207 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject.other Wide-Area Systems en_US
dc.title An Improved Ionospheric Correction Method for Wide-Area Augmentation Systems en_US

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