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4 Reports on Geodesy

4 2006

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Improvements in CEGRN station monitoring and in the CEGRN velocity field

Becker M., Drescher R., Schonemann E., Gutwald J.

Reports on Geodesy

2006

z. 3/78

41-49

GPS observations are still influenced by a whole amount of effects, as for example multiple reflections, ionosphere etc., which have an impact on the accuracy of the observables even on carefully selected sites. Up to now these effects can not be mitigated or modelled satisfactorily. Hence the monitoring of the station specific effects is mandatory in order to judge about data quality and derive weighting or delection schemes for optimal parameter estimation. Within the tasks of the work package 4 of the second Central Europe Geodynamics Project (CERGOP-2), a software tool was developed to monitor the constinuously operating reference stations of the network. The development was carried out using C++ libraries avalieble for the most common operating systems. Here was describe the basic features of this package and give an overview of its present status. Furthermore the update of CEGRN 2005 combination solution is described and the related velocity estimtion 1994 to 2005 is presented.

Impact of atmospheric effects on GPS height determination

Simek J.

Reports on Geodesy

2006

z. 3/78

199-213

A review of the main objectives, parameters and milestones of the work package No8 "Impact of Atmospheric Effects on GPS Height Determination" of the FP5 project CERGOP-2/Environment is given. The CERGOP-2 project ended on July 31, 2006. Some problems related to GPS height determination are outlined and discussed and the main achievements of the participating research teams in IWV and GPS height determination related activities as well as their respective publication activities are summarized.

Geo-kinematical modelling and strain analysis, final report: Aprill 2003 - July 2006

Hefty J., Haslinger C., Becker M., Drescher R.

Reports on Geodesy

2006

z. 3/78

157-197

Final report CERGOP-2/Environment WP3: Periodic improvement of the reference frame CEGRN

Borza T., Fejes I.

Reports on Geodesy

2006

z. 3/78

31-40

The main objective of CERGOP-2/Environment Work Package was defined in the Project as "Monitoring the CEGRN by regular and systematic GPS measurement, satisfying the strict quality standards set by WP2". The main task in the course of the Project was the organization of the CEGRN epoch observation campaigns. Therefore the activies focused on the preparation and the careful realization of these measurements. Two CEGRN campaigns were carried out- CEGRN03 and CEGRN05 - in the same part of the year (in June) in order to minimize seasonal effects in the measurements. In both cases the CEGRN campaigns were overlanned with national campaigns (e.g. in Hungary the HGRN epoch campaigns) by which the scope and efficiency of data availability were greatly enhanced. An other task was to monitor the status of CEGRN. Due to the project support 25 new sites became part of CEGRN, Serbia as a new CEGRN Consortium member (not included in the Project) joined the campaigns in 2005 the first time.