PRODUCTS & SERVICES > DATA ANALYSIS

Routine Data Analysis

The GNSS observation data from the EPN are analysed on different levels:

The solutions provided by the LACs are combined:

The weekly combined EPN position solutions are used by the Reference Frame Coordinator to issue 15-weekly updates of the multi-year EPN position/velocity solution and residual position time series.

Reprocessing

EPN positions and zenith tropospheric delays resulting from the routine data analysis are affected by reference frame changes and upgrades of modelling and software packages. Consequently, consistent results over time can only be generated by a reprocessing of the EPN using one unique data analysis strategy. This reprocessing is coordinated by the Chair of the EPN Reprocessing Working Group and is repeated at regular intervals: