Each week, ten SIRGAS analysis centres deliver loosely constrained weekly solutions including station positions for a certain set of SIRGAS stations. The distribution of the SIRGAS stations among the SIRGAS analysis centres ensures that each station is processed by three analysis centres.
The SIRGAS analysis centres follow unified standards for the computation of loosely constrained weekly solutions for the station positions. These standards are generally based on the conventions outlined by the International Earth Rotation and Reference Systems Service (IERS) and the GNSS-specific guidelines defined by the International GNSS Service (IGS); with the exception that in the individual SIRGAS solutions the satellite orbits and clocks as well as the Earth orientation parameters are fixed to the final weekly IGS values (SIRGAS does not estimate these parameters), and positions for all stations are constrained to ±1 m (to generate the loosely constrained solutions in the SINEX format).
The individual solutions are combined by the SIRGAS combination centres to generate a unified set of weekly station positions aligned to the same reference frame applied by the IGS to computed GNSS satellite orbits.
DGFI-TUM is responsible for processing the SIRGAS-C core network and for combining the core network with the individual solutions delivered by the other SIRGAS analysis centres. The SIRGAS-C network is the primary densification of ITRF in Latin America. It presents a good continental coverage and comprises stabile site locations to ensure high long-term stability of the reference frame. The SIRGAS-C network is the backbone for the consistent integration of the Latin American national reference frames into the continental and global reference frame.
The main processing characteristics applied by DGFI-TUM for the analysis of the SIRGAS-C network are:
Dr.-Ing. Laura Sanchez
Tel. +49 89 23031-1295
Fax +49 89 23031-1240