Report CERGOP-2/Environment WP3 periodic improvement of the reference frame CEGRN, period: April 2004-March 2005

The main objective of CERGOP Work Package (WP-3) is defined in the project as "Monitoring the CEGRN by regular and systematic GPS measurement, satisfying the strict quality standards set by WP 2". This reporting period was "between campaigns" and therefore the main activities focused on maintenance and extension/densification of the existing CEGRN. The preparation of the CEGRN`05 epoch campaign is the task of the Hungarian group. We have distributed the circulars for the compaign call in early 2005. The CEGRN`2005 will be carried out in 20-25 June 2005 overlapping with the HGRN`05 epoch campaign. Several other activities were carried out in relation to the project e.g. footprint monitoring and the search for a new permamnent site in Hungary.