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Open AccessArticle

Improving the Accuracy of Regional Ionospheric Mapping with Double-Difference Carrier Phase Measurement

1
Mechanical and Aerospace Engineering, and the SNU-IAMD, Seoul National University, Seoul 08826, Korea
2
Ecole Nationale de l’Aviation Civile (ENAC), Toulouse 31400, France
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(16), 1849; https://doi.org/10.3390/rs11161849
Received: 27 June 2019 / Revised: 29 July 2019 / Accepted: 6 August 2019 / Published: 8 August 2019
(This article belongs to the Section Atmosphere Remote Sensing)
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Abstract

Regional augmentation systems for a global navigation satellite system (GNSS) provide an ionospheric map correction to the user in order to remove the ionospheric delay error. Measurements are collected from multiple reference stations to estimate the ionospheric map. During this process, the pseudorange measurement error of a reference station causes an error in the correction, which is more evident at edge areas and causes a large error for low-elevation satellites. In this study, an ionospheric modeling algorithm was developed that uses the carrier phase with the pseudorange to greatly reduce the error. The integer-resolved double-difference carrier phase can be obtained through ambiguity resolution method, and the measurement is directly utilized in ionospheric modeling. The performance of the developed method was tested in simulations and with real data for validation. The results of users at various locations showed that the method effectively improved the accuracy of the correction. View Full-Text
Keywords: ionosphere; double-difference carrier phase; augmentation system; differential GNSS ionosphere; double-difference carrier phase; augmentation system; differential GNSS
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Han, D.; Kim, D.; Song, J.; Kee, C. Improving the Accuracy of Regional Ionospheric Mapping with Double-Difference Carrier Phase Measurement. Remote Sens. 2019, 11, 1849.

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