IDS CONTRIBUTION TO ITRF2004

                      TIME SERIES OF STATION COORDINATES
                       IDS Analysis Coordination team
                                June 2005

SERIES OF COORDINATE RESIDUALS TO LINEAR MOTION

Time series of N, E, U residual coordinates with respect to linear motion are 
plotted for all stations that were analysed by the three analysis centers 
listed in table 1. The residuals are output from the CATREF analysis of 
series of unconstrained weekly solutions available at the IDS Data Centers.

Table 1. The sets of station coordinates analysed
       ------------------------------------------
	     Solution     Time span    No of  
                                     stations 
       ------------------------------------------
       	     ignwd05	 1993.0-2005.3	120
       	     inawd03	 1993.0-2004.5	116
       	     lcawd12	 1993.0-2005.1	119
       ------------------------------------------

The graphs show the residuals with color codes as follows. 
Blue: ignwd05, brown: inawd03, green: lcawd12. 

An average annual variation is superimposed (yellow solid line). It is derived 
as the mean of the annual sine waves for ign and lca analysis centers. 

When a discontinuity was defined by the Analysis Centers, a red line shows 
the corresponding date. Note that the derivation of coordinates residuals by 
the CATREF software took those declared discontinuity into account by estimating 
independent positions and velocities before and after the break date. Therefore 
the corresponding sets of residuals do not belong to the same set. An additional 
list of discontinuities is under discussion in June 2005. The proposed dates 
are marked by a green line. 

An additional zone shows the number of satellites used for positioning according 
to the time frame.

At the bottom of the page, the number of weekly coordinates and some statistics 
extracted from the the core_net software output files 
- ignwd05.a.txt
- inawd03.a.txt
- lcawd12.a.txt 
are listed with the same color code as the plots. The extracted statistics include 
the Allan standard deviation (in millimetres) for the one-year sampling time and 
the spectral signature in the East, North and Up directions, and the stability 
index derived from the plotted data. For more details about the core_net 
software (explanation). 

Note that the correct Ottawa DOMES number for the period Feb 1, 1994 - Jan 31, 1998 
is 40102S009. The ina and lca contributions were corrected accordingly.