Delivered-To: igsmail@igscb.jpl.nasa.gov Date: Wed, 21 Apr 2004 13:54:03 -0700 (PDT) From: Michael B Heflin Message-Id: <200404212054.i3LKs3O0014614@kalman.jpl.nasa.gov> To: IGSMAIL@IGSCB.JPL.NASA.GOV Subject: [IGSMAIL-4929]: GPS Time Series Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 21 Apr 13:54:04 PDT 2004 Message Number 4929 ****************************************************************************** Author: M B Heflin JPL's GPS time series web page was announced as a service to the geodetic community on November 29, 1994. Results have been updated roughly every six months. The current solution includes more than one million station-days of GPS data for the first time and is based on roughly 7.2 billion phase and range measurements from more than 900 globally distributed receivers. GPS hardware and software have evolved dramatically over the last decade and maintaining a stable reference frame in spite of all the changes has been a major challenge. These results make use of a transformative approach to reference frame stability based on daily alignment instead of a fiducial approach based on daily constraints. All results are reported in ITRF2000. The updated GPS time series data set is now available at URL: http://sideshow.jpl.nasa.gov/mbh/series.html Recent improvements include: -------------------------------------------------------------------------------- Point positioned results for 905 sites: IGS, SCIGN, BARD, CORS, NBAR, and PANGA Time span 13.2 years: 91JAN23 through 04MAR31 Station-days of GPS data: 1110230 Ambiguity resolved, regionally filtered results for 301 sites: SCIGN Time span 8.2 years: 96JAN01 through 04MAR31 Station-days of GPS data: 371097 Position and velocity estimates Polar motion and length of day time series Geocenter and scale time series All days prior to 95APR06 have been reprocessed All results given in the ITRF2000 reference frame Numerical results available via anonymous ftp