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 http://acc.igs.org/repro3/Long_Product_Filenames_v1.0.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:

• CDDIS: https://cddis.nasa.gov/archive/gnss/products/${wwww}/igs20/
• IGN: ftp://igs-rf.ign.fr/pub/igs20_tests/${wwww}/

where ${wwww} refers to GPS week.

The changes to the filenames are outlined in the 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].