From RFerland at NRCan.gc.ca Fri Nov 3 10:13:27 2006 From: RFerland at NRCan.gc.ca (=?iso-8859-1?Q?Ferland=2C_R=E9mi?=) Date: Fri, 3 Nov 2006 13:13:27 -0500 Subject: [IGSMAIL-5456]: RE: IGS05 Fine Tuning Message-ID: <159FD28F03D76E468EE6650EB50072D001CFB1D9@S0-OTT-X2.nrn.nrcan.gc.ca> ****************************************************************************** IGS Electronic Mail 03 Nov 10:13:29 PST 2006 Message Number 5456 ****************************************************************************** Author: R. Ferland Dear colleagues, Please note that I have just reposted an updated IGT05.snx. Thanks to Stefan Schaer for pointing out a problem. Sorry for the inconveniences, Best Regards, Remi, > -----Original Message----- > From: Ferland, Rimi > Sent: November 3, 2006 10:51 > To: 'igsmail at igscb.jpl.nasa.gov' > Subject: IGS05 Fine Tuning > > Author: R. Ferland > > Dear colleagues, > > Following several feedbacks received the last couple of > weeks, I am proposing minor last minute "fine tuning" to the > IGS realization of ITRF2005. 4 stations are affected: > > Addition: > ========= > > CORD: This station was in earlier proposed realizations. It had > been removed because the station was decommissioned. > The station will be recommissioned and the same equipment > will be reinstalled! (D. Stowers). > This is conditional to the coordinates time series resumes > without discontinuity. > > LHAZ To replace LHAS (a few meters away) suggested by R. Stoeger. > At the site all ACs have been using one or the other. > 2 ACs have been using LHAZ regularly. > > Deletion: > ========= > > GOUG Data problems. Likely difficult to improve in the > short term due to the remoteness of the station. > > FAIR Due to the gradual degradation of the residuals (mainly in > the North/South component). The cause is likely related to > non-linear motion due to post-seismic effects caused by the > Delani earthquake. > > Those deletions are very unfortunate as the two > stations have some very desirable characteristics. > > Other Stations: > =============== > > The coordinates & velocity changes of the other > stations between the current and updated proposed realization > are unchanged (<< 0.1mm & << 0.1mm/y). This applies to both > versions of the realization IGS05 & IGT05. > The total number of stations in remains 132. > > The update can be found at the usual location: > > ftp macs.geod.nrcan.gc.ca > cd /pub/requests/sinex/IGS05 > > > Transformations: > ================ > > For those of you who may want the transformation from > IGS05 (with absolute antenna phase center) and IGb00 > (relative antenna phase center) they are (at epoch 2000.0): > > R X (mas) : -0.0070 > R Y (mas) : 0.0340 > R Z (mas) : -0.0069 > T X (m) : -0.0003 > T Y (m) : -0.0015 > T Z (m) : -0.0061 > SCL (ppb) : 0.7125 > d R X (mas/y) : 0.0033 > d R Y (mas/y) : -0.0001 > d R Z (mas/y) : -0.0161 > d T X (m/y) : -0.0004 > d T Y (m/y) : 0.0007 > d T Z (m/y) : -0.0018 > d SCL (ppb/y) : 0.1748 > > Note that the transformation of the IGS realization, > using relative phase center only, they have been provided in > the earlier e-mail (Sect. 4-1): > http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00170.html > > A comparison of the two sets of transformations indicates > that the phase center change causes variations in the > transformations: > Rotations < 0.02mas, > Translation < 1mm, > Scale < 0.2ppb > The effect on the rates is negligible. > > Starting with GPS week 1400, the "parallel" solutions > using the absolute phase center provided by the ACs will > become the official solutions. This imply that there won't be > any combination for those parallel solutions posted at the usual ftp. > > The cooperation of all those that have been contributing to > this long transition phase is very much appreciated! > Thanks also to all of those that have been providing feedback > on the various versions of the proposed realization! > > Sorry for any inconveniences, > Best Regards, > Remi, >