Home > SIRGAS-CON Network

SIRGAS continuously operating network

SIRGAS was initially realized by two GPS campaigns, one in 1995 (SIRGAS95) with 58 stations, and one in 2000 (SIRGAS2000) with 184 stations. Today, SIRGAS is realized by a network of continuously operating GNSS stations with precisely known positions (referred to an specific reference epoch) and their changes with time (station velocities). This SIRGAS Continuously Operating Network (SIRGAS-CON) is currently composed by ca. 400 permanently operating GNSS sites, 59 of them belonging to the global IGS network. The operational performance of SIRGAS-CON is based on the contribution of more than 50 organizations, which install and operate the permanent stations and voluntarily provide the tracking data for the weekly processing of the network. Since more and more Latin American countries are qualifying their national reference frames by installing GNSS continuously operating stations and these stations shall be consistently integrated into the continental reference frame, the SIRGAS-CON network comprises:

  1. One core network (SIRGAS-C), primary densification of ITRF in Latin America, with a good continental coverage and stabile site locations to ensure high long-term stability of the reference frame.

  2. National reference networks (SIRGAS-N) improving the densification of the core network and providing accessibility to the reference frame at national and local levels. Both, the core network and the national networks satisfy the same characteristics and quality; and each station is processed by three analysis centres.

The SIRGAS-C network is processed by the IGS-RNAAC-SIR (i.e. DGFI-TUM, Germany). The SIRGAS-N national networks are computed by the SIRGAS Local Processing Centres: CEPGE (Ecuador), CNPDG-UNA (Costa Rica), CPAGS-LUZ (Venezuela), IBGE (Brazil), IGAC (Colombia), IGM-Cl (Chile), IGN-Ar (Argentina), INEGI (Mexico), and SGM-Uy (Uruguay). These processing centres deliver loosely constrained weekly solutions for the SIRGAS-N national networks, which are combined with the SIRGAS-C core network to get homogeneous precision for station positions and velocities. The processing strategy guarantees that each regional SIRGAS-CON station is included in three individual solutions. The SIRGAS Combination Centres are IBGE and the IGS-RNAAC-SIR (DGFI-TUM).

The main SIRGAS-CON products are: loosely constrained weekly station coordinates in SINEX format to be included in the IGS polyhedron solutions and for the computation of mult-year solutions; weekly coordinates aligned to the ITRF for applications in Latin America; and multi-year (cumulative) solutions (positions + velocities) for practical and scientific applications requiring time depending positioning.

(c) SIRGAS - All rights reserved - Last update: 08.07.2016 10:38