International GNSS Service(IGS) organization which is one of the most authoritative organizations in the international GNSS precision application service officially released Beidou/GNSS Differential Code Bias(DCB) obtained by Institute of Geodesy and Geophysics(IGG) to the global GNSS users since mid-October. IGG became the world's second organization after German Aerospace Center to submit multiple system DCB products.

Differential Code Bias is the hardware error that must be removed from high-precision GNSS data processing. IGGDCB method developed by Yunbin Yuan researcher and his team of IGG is different from German Aerospace Center's DCB calculation method. The commonly used method of determining the DCB in the world is not suitable for Beidou ground monitoring stations in our country, and we need to estimate multiple system DCB(GPS, GLONASS, BeiDou and Galileo). Under these conditions, IGGDCB method was proposed by IGG, and IGGDCB gives global GNSS users a new choice.