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Ann. Geophys., 34, 259-269, 2016
https://doi.org/10.5194/angeo-34-259-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
18 Feb 2016
Assessment of BeiDou differential code bias variations from multi-GNSS network observations
S. G. Jin1,2, R. Jin1,3, and D. Li1 1Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
2Department of Geomatics Engineering, Bulent Ecevit University, Zonguldak 67100, Turkey
3University of Chinese Academy of Sciences, Beijing 100049, China
Abstract. The differential code bias (DCB) of global navigation satellite systems (GNSSs) affects precise ionospheric modeling and applications. In this paper, daily DCBs of the BeiDou Navigation Satellite System (BDS) are estimated and investigated from 2-year multi-GNSS network observations (2013–2014) based on global ionospheric maps (GIMs) from the Center for Orbit Determination in Europe (CODE), which are compared with Global Positioning System (GPS) results. The DCB of BDS satellites is a little less stable than GPS solutions, especially for geostationary Earth orbit (GEO) satellites. The BDS GEO observations decrease the precision of inclined geosynchronous satellite orbit (IGSO) and medium Earth orbit (MEO) DCB estimations. The RMS of BDS satellites DCB decreases to about 0.2 ns when we remove BDS GEO observations. Zero-mean condition effects are not the dominant factor for the higher RMS of BDS satellites DCB. Although there are no obvious secular variations in the DCB time series, sub-nanosecond variations are visible for both BDS and GPS satellites DCBs during 2013–2014. For satellites in the same orbital plane, their DCB variations have similar characteristics. In addition, variations in receivers DCB in the same region are found with a similar pattern between BDS and GPS. These variations in both GPS and BDS DCBs are mainly related to the estimated error from ionospheric variability, while the BDS DCB intrinsic variation is in sub-nanoseconds.

Citation: Jin, S. G., Jin, R., and Li, D.: Assessment of BeiDou differential code bias variations from multi-GNSS network observations, Ann. Geophys., 34, 259-269, https://doi.org/10.5194/angeo-34-259-2016, 2016.
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Short summary
The differential code bias (DCB) is one of main errors for high-precision GNSS TEC estimation and positioning applications. In this paper, daily DCBs of the BeiDou System (BDS) are estimated and investigated from multi-GNSS network observations (2013–2014), which are compared with GPS results. The DCB of BDS satellites is a little less stable than GPS results, especially for GEO satellites. Zero-mean condition effects are not the dominant factor for the higher RMS of BDS satellite DCB.
The differential code bias (DCB) is one of main errors for high-precision GNSS TEC estimation...
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