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Introduction and Access

Combined EPN Position Solutions

What this is

The EPN Analysis Combination Centre (ACC) produces GNSS station position products by combining results from multiple EPN Analysis Centres (AC). The operational solution is tied to successive reference frames (in accordance with the IGS), but in addition regular reprocessing is performed to ensure all solutions are in the same reference frame. The solutions below are available in the IGS20 frame (or any of its updates, e.g. IGb20, IGc20, ...).

Available from

All solutions and associated files mentioned below are available from BKG (https://igs.bkg.bund.de/root_ftp/EUREF/products/WWWW/) and BEV (https://gnss.bev.gv.at/at.gv.bev.dc/data/products/(W)WWW/).

Available Combined Products

A. Operational Products (Since GPS Week 2238 – from 27 Nov 2022)

Weekly combined positions

  • Station positions and covariances (SINEX): EUR0OPSSNX_CCYYDDD0000_07D_07D_SOL.SNX.gz
  • Summary information: EUR0OPSSNX_CCYYDDD0000_07D_07D_SUM.SUM.gz
  • Station positions (CRD) - starting from GPS week 2399: EUR0OPSSNX_CCYYDDD0000_07D_07D_CRD.SNX.gz

Daily combined positions

  • Station positions and covariances (SINEX): EUR0OPSSNX_CCYYDDD0000_01D_01D_SOL.SNX.gz
  • Summary information: EUR0OPSSNX_CCYYDDD0000_01D_01D_SUM.SUM.gz
  • Station positions (CRD) - starting from GPS week 2399: EUR0OPSSNX_CCYYDDD0000_07D_07D_CRD.SNX.gz

Rapid daily combined positions - latency of 1 day

  • Station positions and covariances (SINEX): EUR0RAPSNX_CCYYDDD0000_01D_01D_SOL.SNX.gz
  • Summary information: EUR0RAPSNX_CCYYDDD0000_01D_01D_SUM.SUM.gz
B. Reprocessed Solutions - EPN-Repro3 (Before GPS Week 2238 - before 27 Nov 2022)

Weekly combined positions

  • Station positions and covariances (SINEX): EUR0E03SNX_CCYYDDD0000_07D_07D_SOL.SNX.gz
  • Summary information: EUR0E03SNX_CCYYDDD0000_07D_07D_SUM.SUM.gz

Daily combined positions

  • Station positions and covariances (SINEX): EUR0E03SNX_CCYYDDD0000_01D_01D_SOL.SNX.gz
  • Summary information: EUR0E03SNX_CCYYDDD0000_01D_01D_SUM.SUM.gz
  • Summary information (YAML format): EUR0E03SNX_CCYYDDD0000_01D_01D_SUM.YML.gz

How the combination works

Combination strategy

The combined EPN solution is created by:

  • Collecting daily solutions from all participating ACs.
  • Checking metadata (station information, antenna calibration, etc.).
  • Aligning and combining results across AC contributions to generate consistent station coordinates and covariance information for all stations.

Further technical details and methodology are available in a downloadable strategy document.

Reference frames

The combined EPN solutions are tied to successive implementations of the International Terrestrial Reference System (ITRS) (e.g. IGb20). A separate page provides tables showing which reference frame was used during which time periods.