IGS Analysis Center Coordinator (ACC)

run by GA & MIT

This site gives information about the products of the International GNSS Service (IGS),especially their quality and is intended as a point of reference for analysis centres contributing products to the IGS. The IGS Analysis Center Coordinator (ACC) has overall responsibility for generating the main official IGS combined products. Currently, there are three IGS product lines for GNSS satellite orbits and clocks, namely the IGS Final, the IGS Rapid, and the IGS Ultra-rapid products. The tables and figures for the Final products are updated weekly. Other pages are updated shortly after the corresponding combinations. The figures show the results of the past 60 weeks except for the "Final (ALL)" plots which show the results of the IGS orbit combinations since their beginning in late 1993.

Recent Changes, Announcements, Notices, & Reports

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:
ftp://igs-rf.ign.fr/pub/IGSR3/IGSR3_2077.snx
ftp://igs-rf.ign.fr/pub/IGSR3/IGSR3_2077.ssc (without covariance matrix)
The associated discontinuity list and post-seismic deformation models are respectively available at:
ftp://igs-rf.ign.fr/pub/IGSR3/soln_IGSR3.snx
ftp://igs-rf.ign.fr/pub/IGSR3/psd_IGSR3.snx

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
  • see package i2_soft_update_v1d.20100218.tgz
  • background & details given in IERS Conventions (2010), chapter 9.4