IGS Real Time Analysis Center Products

A number of contributing Real Time Analysis Centres provide daily clock RINEX and SP3 product files to ESOC, which performs the AC coordination activities. The products are derived from the Real Time infrastructure of the individual Analysis Centres. ESOC then computes a combination clock product which is disseminated daily, along with a comparison summary report. The algorithms used for the combination are the same as will be used in the near future for providing a Real Time combination product stream. This will comprise the clock corrections for the GPS satellites and the IGU-predicted orbits.

The daily combination clock RINEX files and comparison reports are now uploaded to the following IGS GDC's:
CDDIS
IGN
KASI

Target combination product performances are:
Satellite Clock Accuracy: 0.3 ns
Station Clock Accuracy: 0.3 ns
Orbit Accuracy: At the level of the IGS Ultra predictions Latency (when available in RT): 10 s

The clock accuracy is measured as the RMS difference between the IGS rapid or final clock solution and the combination solution, after removing a common offset per epoch.

Real-Time Analysis Center Combination Results