The International DORIS Service July 2003 – December 2005 report

5 THE NETWORK
5.1 GENERAL STATUS OF THE NETWORK
IDS Report – July 2003 to December 2005 16
Hervé Fagard (1)
(1) IGN, France
The stations that are currently part of the ground segment of the DORIS system can be divided
in two groups:
• The “permanent stations”, whose primary purpose is to take part in the orbit
determination for the satellites carrying DORIS instruments. Such stations were installed
for an a priori unlimited time period, following an initial CNES and IGN proposal.
Nevertheless some circumstances may require that we have to remove a station and
look for another host agency.
• The “IDS stations”, which have been installed following proposals submitted by other
organizations with varied scientific motivations, for a limited or undefined time period.
Figure 4 shows the status of the permanent network at the end of 2005, and the IDS
experiments that have been operating sometime in 2004 and/or 2005.
Figure 4. IDS experiments in 2004 and 2005
5.2 RENOVATION PROGRAM OF THE PERMANENT NETWORK
The current status of the DORIS permanent network, as regards the antenna stability, is shown
on figure 5. The stations renovation program, initiated in 2000 in order to improve the long term
stability of the antenna support, was continued, as illustrated in figure 6.
In 2004 the following stations were renovated: