DGFI is responsible for the IGS Regional Network Associate Analysis Centre for SIRGAS (IGS RNAAC SIR) since June 1996. Its main objective is to compute and deliver loosely constrained weekly solutions for the reference frame SIRGAS-CON (SIRGAS Continuously Operating Network) to the IGS (International GNSS Service). These solutions are combined together with those generated by the other global and regional IGS Analysis Centres to form the IGS Polyhedron. The processing of the SIRGAS-CON reference frame also includes the computation of weekly station positions referring to the current ITRF (International Terrestrial Reference Frame) and accumulative position and velocity solutions for estimating the kinematics of the network. The first ones are introduced as reference coordinates for surveying applications (GPS positioning, cadastre, etc.) in Latin America, the second ones support scientific and practical projects requiring coordinate time-dependence.

Until 31 August 2008, DGFI processed the entire SIRGAS-CON network in one block only. However, given the large number of SIRGAS-CON stations, this usual one-block processing became unfeasible and it was necessary to re-define the analysis strategy of the network. The new analysis strategy is based on i) defining a core continental network as the primary densification of the ITRF in Latin America and the Caribbean, and ii) improving the geographical density of this core network by means of densification sub-networks. The core network is computed by DGFI. The densification sub-networks are processed by eigth SIRGAS Local Processing Centres hosted by Latin American Institutions. The individual contributions are integrated in a unified solution by the SIRGAS Combination Centres DGFI and IBGE. Weekly stations positions as well as multi-year solutions are available at the SIRGAS FTP Server (ftp.sirgas.org) as well as at the SIRGAS web page (www.sirgas.org).