The differential code bias (DCB) is one estimated parameter in ionospheric models using data from GNSS. DCB's values from satellites or receivers can be obtained from IONEX format files provided by IGS and these parameters are estimated using a global GNSS network. In this context, this paper presents an estimation technique of DCB based on the IONEX files, in order to compute a DCB for any local station. The method consists in applying the arithmetic mean of the linear combination of geometry free. The processing is performed with less computational effort than that used in the ionospheric modeling, because it is not necessary to use the TEC modeling. The DCB's were estimated with stations of Brazilian region and showed agreement of 0.47 ns in comparison to the DCB's provided by CODE.
DCB; TEC; IONEX
