INVESTIGADORES
MACKERN OBERTI maria Virginia
congresos y reuniones científicas
Título:
Improved Analysis Strategy and Accessibility
Autor/es:
BRUNINI C.; L.SANCHEZ; H.DREWES; M. V. MACKERN; S. COSTA; W. MARTINEZ; W. SEEMULLER; A. DA SILVA
Lugar:
Buenos Aires
Reunión:
Congreso; IAG 2009 Scientific Assembly; 2009
Institución organizadora:
International Asociation of Geodesy
Resumen:
The SIRGAS reference system is at present realized by the SIRGAS Continuously
Operating Network (SIRGAS-CON) composed by about 200 stations distributed
over Latin America and the Caribbean. SIRGAS member countries are improving
their national reference frames by installing continuously operating GPS stations,
which have to be consistently integrated into the continental network. As the
number of these stations is rapidly increasing, the analysis strategy of the
SIRGAS-CON network is based on two hierarchy levels: a) A core network
with homogeneous continental coverage and stable site locations ensures the
long-term stability of the reference frame. This network is processed by DGFI
(Germany) as the IGS RNAAC SIR. b) Several densification sub-networks
(corresponding to the national reference networks) improve the accessibility to
the reference frame in the individual countries. Currently, the SIRGAS-CON
stations are classified in three densification sub-networks (a southern, a middle,
and a northern one), which are processed by the SIRGAS Local Processing
Centres CIMA (Argentina), IBGE (Brazil), and IGAC (Colombia). These four
Processing Centres deliver loosely constrained weekly solutions for the assigned
sub-networks, which are integrated in a unified solution by the SIRGAS Combi-
nation Centres (DGFI and IBGE). The main SIRGAS products are: loosely
network, weekly positions aligned to the ITRF as reference for GPS positioning in
Latin America; and multi-year solutions (positions + velocities) for practical and
scientific applications requiring time-dependent coordinates. This paper describes
the analysis of the SIRGAS-CON network as the current realization of the
SIRGAS reference system, its quality and consistency, as well as the planned
activities to continue improving this reference frame. constrained weekly solutions in SINEX format for further combinations of the