[IGSMAIL-8682] IGS combined demonstration multi-GNSS Final Combinations now available [SEC=OFFICIAL]

Fri Mar 27 08:21:41 UTC 2026

Dear Colleagues,

The IGS Analysis Centre Coordinator (ACC) is pleased to announce that the combined demonstration multi‑GNSS (GPS + Galileo + GLONASS) Final products, including orbits, clocks, biases, and reference attitudes, are now available via CDDIS (and soon other global data centres). These demonstration Final products are intended for users who wish to access combined Galileo and GLONASS products beyond the Repro3 period. The products are available starting from GPS week 2238 (2022, day of year 331) and extend to the current date. They will continue to be provided on an ongoing basis, alongside the already available multi-GNSS ultra-rapid demonstration products. Users are encouraged to make use of these products, test them in their workflows, and provide feedback to the IGS ACC: acc at igs.org<mailto:acc at igs.org>.

The demonstration products were generated using Geoscience Australia’s ROCS orbit combination software<https://github.com/GeoscienceAustralia/ROCS>, Natural Resources Canada’s SPARKCombo orbit and clock combination software ( see this paper<https://link.springer.com/article/10.1007/s00190-019-01335-w> for methodology), and TU Graz’s GROOPS software<https://github.com/groops-devs/groops> for reference attitudes. GFZ’s SPOCC orbit and clock combination software<https://gnss.gfz.de/services/spocc> is also being evaluated as part of the multi‑GNSS combination roadmap. We sincerely thank all contributors for their substantial support of the multi-GNSS combination campaign. In addition, we thank and acknowledge the continued contributions and efforts of all IGS Analysis Centres.

Available Multi-GNSS Demonstration Products
As a result of these developments, the following multi-GNSS combined demonstration products are now available on an ongoing basis:

  1.  Final combined multi-GNSS demonstration products (now available from GPS week 2238 and continuing forward on a weekly basis similar to the Final operational products schedule):
     *   Satellite orbits: https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_05M_ORB.SP3.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_05M_ORB.SP3.gz>
     *   Satellite clocks: https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_30S_CLK.CLK.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_30S_CLK.CLK.gz>
     *   Observation-specific phase and code biases: https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_OSB.BIA.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_OSB.BIA.gz>
     *   Reference satellite attitudes: https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_30S_ATT.OBX.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_30S_ATT.OBX.gz>
     *   Orbit combination summary files (human-readable): https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_SUM.SUM.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_SUM.SUM.gz>
     *   Orbit combination summary files (machine-readable): https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_SUM.JSON.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_SUM.JSON.gz>

  1.  Ultra-Rapid multi-GNSS demonstration products (already available four times a day since GPS week 2294):
     *   Satellite orbits: https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_05M_ORB.SP3.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_05M_ORB.SP3.gz>
     *   Orbit combination summary files (human-readable): https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_02D_SUM.SUM.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_02D_SUM.SUM.gz>
     *   Orbit combination summary files (machine-readable): https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_02D_SUM.JSON.gz<https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_02D_SUM.JSON.gz>

Important Notice: Discontinuation of GLONASS Experimental Products
As both Final and Ultra-Rapid multi-GNSS combined demonstration products are now available and include GPS, Galileo, and GLONASS, the IGS combined GLONASS experimental Final and Ultra-Rapid products will be discontinued starting with GPS week 2418 (2026, day of year 130  - 10 May 2026). The following products will no longer be provided after this date:

  1.  IGS combined GLONASS experimental Final orbits: igl<wwww><d>.sp3.Z
  2.  GLONASS Final orbit combination summary files: igl<wwww>7.sum.Z
  3.  IGS combined GLONASS experimental ultra-rapid orbits: igv<wwww><d>_<hr>.sp3.Z
  4.  GLONASS ultra-rapid orbit combination summary files: igv<wwww><d>_<hr>.sum.Z

Users who rely on GLONASS products are advised to transition their processing chains to the new multi-GNSS combined products.

GPS-Only Operational Products
The IGS combined GPS-only Final products (IGS0OPSFIN) will continue to be provided and should be regarded as the primary operational products while the transition to fully operational multi-GNSS combinations is finalized. Further announcements on this transition will follow.

Best Regards,
Salim Masoumi, Taylor Yates, Thomas Herring
IGS ACC Team

Salim Masoumi Ph.D. |  GNSS Team Leader
GNSS Analysis Section  |  Positioning Australia Branch
Space Division

t +61 2 6249 9688    ga.gov.au<https://www.ga.gov.au/>

Mon to Fri: 9:00 – 17:00

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