[IGSMAIL-4377]: possible shift at BRMU

Jim Ray (NGS 301-713-2850 x112) jimr at ngs.noaa.gov
Wed May 14 11:42:55 PDT 2003

IGS Electronic Mail      14 May 11:43:30 PDT 2003      Message Number 4377

Author: Jim Ray

After equipment changes made at BRMU in March, it appears that there may
be a small shift in the observed station coordinates.  A Trimble 5700
receiver and TRM29659.00 antenna + UNAV radome replaced the previous
ROGUE SNR-8000 receiver and AOAD/M_T antenna (no radome) on 12 March 2003;
see IGS Mail #4297 and the site log.

Based on data collected since that time, it appears that the observed
station position may have shifted by about -4 mm in the North direction.
Any possible change in the E or Up directions is probably not signficant.

Users are cautioned to be aware of this possibility when using BRMU data
for frame alignment where accuracies at the mm-level are sought.  Note that
BRMU is one of set of 54 stations used by the IGS to realize the IGS00
terrestrial reference frame.

More information about the IGSMail mailing list