Differential Code Bias Estimation Using Multi-GNSS Observations and Global Ionosphere Maps

O. Montenbruck, A. Hauschild, P. Steigenberger

Abstract:	Measurements of Global Navigation Satellite System (GNSS) receivers are affected by systematic offsets related to group and phase delays of the signal generation and processing chain. The resulting code and phase biases depend on the transmission frequency and the employed signal modulation. Within this study differential code biases (DCBs) of legacy and modernized GNSS signals are derived from pseudodrange observations of a global multi-GNSS receiver network. Global ionosphere maps (GIMs) are employed for the correction of ionospheric path delays. Satellite and receiver-specific contributions are separated based on the assumption of additive biases and a zero-mean condition for the satellite biases within a constellation. Based on 6 months of data collected within the Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS), DCBs for the publicly available signals of GPS, Galileo and BeiDou have been determined. The quality of the resulting DCB estimates is assessed and compared against group delay parameters transmitted by the GNSS providers as part of the broadcast ephemeris data.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	802 - 812
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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