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Recent Changes, Announcements, Notices, & Reports
IGS is adopting a new reference frame, Repro3 standards and long filenames
The IGS is adopting a new reference frame, called IGS20, as the basis of its products. IGS20 is closely related to ITRF2020, released in April 2022. An updated set of satellite and ground antenna calibrations, igs20.atx, will also become effective at the same time and should be used together with IGS20. The IGS intends to switch from IGb14/igs14.atx to IGS20/igs20.atx starting with the products of GPS week 2238 (27 November 2022).
At the same time as the switch to IGS20/igs20.atx, the IGS will also adopt for its operational products the same conventions and models as used in its third reprocessing campaign (repro3; see http://acc.igs.org/repro3/repro3.html). This includes in particular the adoption of new long filenames for the IGS products (see https://files.igs.org/pub/resource/guidelines/Guidelines_For_Long_Product_Filenames_in_the_IGS_v2.0.pdf).
Starting from GPS week 2238, the IGS final, rapid and ultra-rapid products will be available only in long filenames.
There are trial IGS final, rapid and ultra-rapid products aligned with IGS20 and with long filenames available for testing purposes at the following locations:
where ${wwww} refers to GPS week.
The changes to the filenames are outlined in Guideline for the transition of the IGS products to the long filenames with some examples. The document may be updated with future versions.
For more detailed information about the upcoming changes, please see [IGSMAIL-8238], [IGSMAIL-8256], and [IGSMAIL-8274].
- A corrected version of FES2014b has been released, at http://grace.obs-mip.fr/dealiasing_and_tides/ocean-tides/.
- The final version of the repro3 reference frame SINEX file is now available at:
- The associated discontinuity list and post-seismic deformation models are respectively available at:
- The ANTEX file to be used for repro3 can be downloaded from igsR3_2077.atx
- Long Product Name Convention
- Updated Box wing model for Earth-albedo-effects now available (see repro3 website), provided by Thomas Herring
- Satellite Transmit power: Technical note on updated transmit power values for repro3, provided by Peter Steigenberger
- ORBEX: Proposal for GNSS attitude quaternion exchange within ORBEX
Miscellaneous advice and information for ACs
- Clock processing recommendation by M. Coleman (NRL)
- Please try to include sites listed in below two files (machine readable)
- UTCk Reference Clock Stations – Preferred to have at all times both in IGS and IGR (in the order of importance)
- Non-UTCk Clock Stations but very stable clocks
- Sources for a priori EOP prediction information
- A clock prediction strategy
- Software for higher-order iono corrections
Last Updated on 7 Feb 2023 13:06 UTC