IAG gnss@ROB
A Working Group of the International Association of Geodesy
Subcommission 1.3 on Regional Reference Frames

Combination (Status September 2013)

Jan 13, 2015

A) Weekly Combinations

Individual weekly SINEXs have been combined with CATREF [Altamimi et al. 2007]. These preliminary weekly combinations lead to a typical 3D weekly RMS which ranges from 2 mm to 5 mm.
Figure 1
Figure 1: RMS of the weekly combinations plotted as a function of the time.

B) Generation of the Combined Cumulative Solution

The cumulative solution is combined with CATREF Software and aligned to IGS08.

4
Figure 2: Network of the combined solution. Stations available in the current combination (1770 stations). ~ 1000 NGS stations not yet included in the combination.
Figure 2
Figure 3: Weekly RMS of different stacked solutions plotted as a function of the time. The combined solution is shown in thick black line. The individual solutions (IGS, AFREF, APREF, EUREF, NAREF-GSB, NAREF-NGS, SIRGAS) contributing to the combined solution are shown in thin colored lines.

C) Comparison of individual and combined time series

Several residual position time series are shown for The residual position time series of the individual solutions (IGS, AFREF, APREF, EUREF, NAREF-GSB, NAREF-NGS, SIRGAS) and of the combined solution (COMBINATION) are compared for 3 stations in La Rochelle (France) Tucson, Arizona, USA, UshuaiTucson, Arizona, USA

ONSA A 10402M004 (Onsala, Sweden) [IGS, AFR, APR, EUR, GSB, NGS, ]
ONSAONSA




LROC A 10023M001 (La Rochelle, France)[IGS, APR, EUR, NGS]
LROCLROC




COT1 A 49469M001 (Tucson, Arizona, USA) [IGS, NGS]
COT1COT1




AUTF [IGS, SIR]
AUTFAUTF
Figures 4: Residual position time series from
the individual solutions (IGS, AFREF, APREF, EUREF, NAREF-GSB, NAREF-NGS, SIRGAS) on the left
and the combined solution on the right (COMBINATION).