1. Böhm J, Niell A, Tregoning P, Schuh H (2006) Global mapping function (GMF): a new empirical mapping function based on numerical weather model data. Geophys Res Lett 33(7):1
2. Beutler G, Brockmann E, Gurtner W, Hugentobler U, Verdun A (1994) Extended orbit modeling techniques at the CODE processing center of the international GPS service for geodynamics (IGS): theory and initial results. Manuscr Geodaet 19(6):367–386
3. Blewitt G (1989) Carrier phase ambiguity resolution for the global positioning system applied to geodetic baselines up to 2000 km. J Geophys Res Solid Earth 94(B8):10187–10203
4. CSNO (China Satellite Navigation Office) (2018a) BeiDou Navigation Satellite System Open Service Performance Standard (version 2.0) http://www.beidou.gov.cn/xt/gfxz/201812/P020181227529449178798.pdf
5. CSNO (China Satellite Navigation Office) (2018b) Development of the BeiDou navigation satellite system (version 3.0) http://www.beidou.gov.cn/xt/gfxz/201812/P020190117356387956569.pdf