IGS08: the IGS realization of ITRF2008

On April 17, 2011, the International GNSS Service (IGS) stopped using the IGS05 reference frame and adopted a new one, called IGS08, as the basis of its products. The latter was derived from the latest release of the International Terrestrial Reference Frame (ITRF2008). However, the simultaneous adoption of a new set of antenna phase center calibrations by the IGS required slight adaptations of ITRF2008 positions for 65 of the 232 IGS08 stations. The impact of the switch from IGS05 to IGS08 on GNSS station coordinates was twofold: in addition to a global transformation due to the frame change from ITRF2005 to ITRF2008, many station coordinates underwent small shifts due to antenna calibration updates, which need to be accounted for in any comparison or alignment of an IGS05-consistent solution to IGS08. Because the heterogeneous distribution of the IGS08 network makes it sub-optimal for the alignment of global frames, a smaller well-distributed sub-network was additionally designed and designated as the IGS08 core network. Only 2 months after their implementation, both the full IGS08 network and the IGS08 core network already strongly suffer from the loss of many reference stations. To avoid a future crisis situation, updates of IGS08 will certainly have to be considered before the next ITRF release.

[1]  X. Collilieux,et al.  Global optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF , 2009 .

[2]  Xavier Collilieux,et al.  Quality assessment of GPS reprocessed terrestrial reference frame , 2011 .

[3]  Zuheir Altamimi,et al.  IGS reference frames: status and future improvements , 2004 .

[4]  C. Rizos,et al.  The International GNSS Service in a changing landscape of Global Navigation Satellite Systems , 2009 .

[5]  Geoffrey Blewitt,et al.  Effect of annual signals on geodetic velocity , 2002 .

[6]  Xavier Collilieux,et al.  Comparison of very long baseline interferometry, GPS, and satellite laser ranging height residuals from ITRF2005 using spectral and correlation methods , 2007 .

[7]  Zuheir Altamimi,et al.  Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters , 2011, Journal of Geodesy.

[8]  J. Ray,et al.  Effect of the satellite laser ranging network distribution on geocenter motion estimation , 2009 .

[9]  Peter Steigenberger,et al.  Reprocessing of a global GPS network , 2006 .

[10]  J. Saastamoinen,et al.  Contributions to the theory of atmospheric refraction , 1972 .

[11]  H. Schuh,et al.  Short Note: A global model of pressure and temperature for geodetic applications , 2007 .

[12]  Peter Steigenberger,et al.  Generation of a consistent absolute phase-center correction model for GPS receiver and satellite antennas , 2007 .

[13]  Jim R. Ray,et al.  Dependence of IGS Products on the ITRF Datum , 2013 .

[14]  L. Mervart,et al.  Bernese GPS Software Version 5.0 , 2007 .

[15]  H. Schuh,et al.  Global Mapping Function (GMF): A new empirical mapping function based on numerical weather model data , 2006 .

[16]  R. Ferland,et al.  The IGS-combined station coordinates, earth rotation parameters and apparent geocenter , 2009 .

[17]  M. Bouin,et al.  Geocentric sea-level trend estimates from GPS analyses at relevant tide gauges world-wide , 2007 .

[18]  Xavier Collilieux,et al.  IGS contribution to the ITRF , 2009 .

[19]  Z. Altamimi,et al.  ITRF2008: an improved solution of the international terrestrial reference frame , 2011 .

[20]  Ch. Reigber,et al.  Satellite antenna phase center offsets and scale errors in GPS solutions , 2003 .