[IGSMAIL-5456]: RE: IGS05 Fine Tuning
Ferland, Rémi
RFerland at NRCan.gc.ca
Fri Nov 3 10:13:27 PST 2006
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IGS Electronic Mail 03 Nov 10:13:29 PST 2006 Message Number 5456
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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,
>
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