The new multi-year position and velocity solution SIR09P01 of the IGS Regional Network Associate Analysis Centre (IGS RNAAC SIR)

The Deutsches Geodätisches Forschungsinstitut (DGFI) acts as the IGS Regional Network Associate Analysis Centre for SIRGAS (IGS RNAAC SIR) since June 1996. Each week a loosely constrained position solution including all available observations of the SIRGAS Continuously Operating Network (SIRGAS-CON) is generated and delivered to the IGS Data Centres to be integrated into the IGS polyhedron. Based on these weekly solutions, DGFI also computes multi-annual solutions for station positions and velocities to estimate the kinematics of the SIRGAS reference frame. These multi-annual solutions are updated yearly and include those stations operating more than 2 years continuously. This paper describes the computation of the latest multi-annual solution of the SIRGAS-CON network. Identified as SIR09P01, it was released in June 2009 and contains all the weekly solutions provided by the SIRGAS Analysis Centres from January 2, 2000 (GPS week 1,043) to January 3, 2009 (GPS week 1,512). It refers to the IGS05 frame at the epoch 2005.0 and provides positions and velocities for 128 SIRGAS-CON stations. The accuracy of its positions at the reference epoch is estimated to be better than ±0.5 mm in the horizontal component and ±0.9 mm in the vertical one. The accuracy of the linear velocities is about ±0.8 mm/a.