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SIRGAS - Analysis Center - IBGE


As of 2005, the IBGE´s Coordination of Geodesy has been performing the weekly processing of the data from every station of the Brazilian Network of Continuous Monitoring of GNSS Systems - RBMC, aiming at assessing the quality of the observations and the maintenance of the new SIRGAS2000 Geocentric Reference System, officially used in Brazil since February of that year. After three years of experience and optimization of these activities, the IBGE became a SIRGAS Analysis Center in May 2008, being responsible for officially processing the data from continuous GNSS stations belonging to the SIRGAS-CON Network. On an experimental basis, the IBGE started to couple the weekly solutions from every SIRGAS processing center, assisting in the activities of the Workgroup I (Reference System) of SIRGAS.

About the publication - Processing Center

The establishment and materialization of a geodetic referential for the Americas is one of the major activities of SIRGAS. The materialization is made through the establishment of a geodetic network of reference, being an activity of the Workgroup I - WGI. Aiming at this purpose, two GPS measurement campaigns were carried out in 1995 and 2000, which established the SIRGAS95 and SIRGAS2000 networks, respectively.

Taking into account the increasing number of GNSS permanent stations established in the American continent over the last years, the WGI decided to create the Continuous Reference Network - SIRGAS-CON, which comprises the GNSS permanent stations of the networks of the Latin American and Caribbean countries. The organization of the SIRGAS-CON Network was proposed and accepted in the May 2008 meeting of the WGI, involving the following components: Local Operational Centers or data centers, Local Processing Centers, Combination Centers and the Coordinator of the network. Most of those components already existed, though there was a need to coordinate a number of activities and the responsibility of each part. Another need was the subdivision of the network into sub-networks in order to process the stations by more than one center, allowing a redundancy in the solutions and a better analysis of the results.

Currently – July 2014 –, the SIRGAS-CON network comprises nearly 300 stations located in Latin America, Caribbean islands and Antarctica, distributed along:

I - A network with continental coverage (SIRGAS-C), characterizing a densification of the ITRF in Latin America and weekly processed by the DGFI, as an IGS-RNAAC-SIR (IGS Regional Network Associate Analysis Center) analysis center.

II - National networks of reference (SIRGAS-N), which densify the continental network and are calculated by the SIRGAS Local Processing Centers, such as:

  • a) CEPGE (Ecuador)
  • b) CNPDG-UNA (Costa Rica)
  • c) CPAGS-LUZ (Venezuela)
  • d) IBGE (Brazil)
  • e) IGAC (Colombia)
  • f) IGM-Cl (Chile)
  • h) IGN-Ar (Argentina)
  • i) INEGI (Mexico)
  • j) SGM-Uy (Uruguay)


Both the continental and national networks have the same quality features and each station is processed by three processing centers. These Centers produce loosely-constrained weekly solutions of the SIRGAS-N networks, which are later coupled with the SIRGAS-C continental network, thus establishing the position and speed of every station. This task is carried out by the IBGE and DGFI and the results are released to the community through the server. The "fixed" weekly solutions are related to the time of the observation and ITRF in force, now the IGb08, an accomplishment of the ITRF2008.

Processed Stations

The stations belonging to the SIRGAS-CON network have double-frequency equipment and are materialized by means of stable structures installed on the top, called forced centering devices.

More information on the configuration of a SIRGAS-CON station can be found in the Installation Guide of SIRGAS-CON Stations.

Information on each station can be found on:


The SIRGAS - IBGE Processing Center produces weekly files in the SINEX format (Software Independent Exchange), of the sub-network processed by the IBGE. Currently about 120 stations belonging to the SIRGAS-CON network located in Argentina, Bolivia, Brazil, French Guiana, Peru, Suriname and Uruguay are included in this processing.

The results files here available are injunction free and can be used to adjust differential solutions, in the densification of any area. These files are available three weeks after the tracking date of the observation. The following denomination is adopted for SINEX files:

IBGwwww7.SNX ? Injunction-free solution
(where wwww = GPS week)

The results files are available on:

The strategies, parameters and models adopted to produce the weekly results are:


Observation Type

Double Difference Phase

Software used

Bernese 5.0 (up to GPS 1779 week) and Bernese 5.2 (from GPS 1780 week onward)

Collection interval

30 sec

Elevation Angle


Strategy to select Baselines

OBS-MAX (according to the amount of common observations)


Final IGS - IGb08

"A priori" troposhpere model

Mapping function (Wet_VMF Vienna Mapping Functions)


QIF (Quasi Ionosphere Free) strategy with global maps produced by CODE (Center for Orbit Determination in Europe)

Model of Ocean Loading


Phase Center Variation

PHAS_COD.I05 (Absolute – IGS05) Period: 1199 to 1631
PHAS_COD.I08 (Absolute – IGS08) Period: 1632 to 1779
PHAS_IGS.08 (Absolute – IGS08) Period: from 1780 onward

"A priori" Coordinates and Velocities

IGS05 Period: 1199 to 1631 (1199 to 1399 – Reprocessed!)
IGS08 Period: 1632 to 1708
IGb08 Period: from 1709 onward

Daily Solutions

injunction free (every station receives a 1 meter injunction)

Weekly Solutions

11 IGS stations (BRAZ, CHPI, CONZ, CRO1, ISPA, LPGS, MANA, OHIG,  SANT, SCUB and  UNSA) are used to inject the weekly solution at ±0.1 mm

Format of daily and weekly solutions

SINEX format (SNX files)



Learn more - Processing Center