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1
Content available remote The contribution of the university of Padova to Central European Geodesy
Caporali A.
Reports on Geodesy
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2003
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z. 2/65
23-32
EN
The definition and maintenance of a geodetic reference system by modern techniques requires systematic temporal changes of the position of the defining stations to be taken in to account. Most of these drifts are accommodated by present day plate tectonics. If the lithospheric plate to which a given station belongs were perfectly rigid, then a simple plate model based upon rigid rotations about Eulerian poles would suffice to predict the horizontal coordinates of each station at any epoch, once the coordinates of that station are known at a reference epoch. In Europe, there are stations well located inside old, stable areas which may be considered rigid, but other stations are at or near continental margins undergoing active deformation, or are within a relatively recent portion of a tectonic unit subject to intraplate stress or volcanism. Velocities of stations in the most recent ITRF solutions do, in fact, exbibit in some cases departures from the NUVELIA NNR plate model in Europe and elsewhere, but the reasons for these discrepancies are not always well understood. For example, if a particular station of the network exbibits a velocity anomaly relative to a reference velocity model, then it is of interest to understand the reasons for the anomaly, and its spatial extent, that is if it is local to that station, or if nearby stations are also affected, and with which tapering as a function of distance. As part of the research activities in support of the CEI/CERGOP and EUREF, the time series of coordinates of European Permanent Network (EPN) stations in the Alpine - Mediterranean - Dinarides region are examined both in the time and space domains, and hypotheses are formulated on the reasons of systematic departures from linearity. The time domain analysis consists in the construction of the Power Spectra I Density and autocorrelation function of the time series of each coordinate for each station, the assessment of the type(s) of noise and periodicities, and an estimate of the uncertainty in the velocity. The space domain approach consists in cross correlating time series of stations and investigating the cross correlation function as a function of the space separation between pairs of stations. The combined analysis in the space and time domains of the time series provides a description of small but non negligible changes of coordinates the pernanent stations which should be taken into account if the realisation of the reference system is to be as accurate as the coordinates of the defining stations.
2
Content available remote Analysis of the relative velocities of the EPN - new results after four years
Kostelecký (jr.) J., Kostelecký J.
Reports on Geodesy
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2003
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z. 1/64
121-131
EN
The coordinates of 143 EUREF permanent network (EPN) sites were analysed to find the secular time changes. Analysis is based on weekly combined solutions of EPN using method of finding jumps, trends and periodicities. The method of continuum mechanics is applied for possible geodynamical interpretation.
3
Content available remote WUT LAC status report
Bogusz J., Figurski M., Kruczyk M., Kujawa L., Liwosz T., Pfeil M., Rogowski J.
Reports on Geodesy
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2001
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z. 3/58
67-72
4
Content available remote The EUREF permanent network report 2000
Bruyninx C., Roosbeek F., Habrich H., Kenyeres A., Stangl G.
Reports on Geodesy
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2001
|
z. 3/58
85-90
5
Content available remote Report on the EUREF combined solution generation
Habrich H.
Reports on Geodesy
|
2001
|
z. 3/58
17-22
6
Content available remote Report of EUREF analysis centre OLG exception handling and open questions
Pany T., Pesec P., Stangl G.
Reports on Geodesy
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2001
|
z. 3/58
29-33
7
Content available remote Report from the NKG analysis centre
Jivall L., Johansson J.
Reports on Geodesy
|
2001
|
z. 3/58
81-84
8
Content available remote Overview of the EUREF permanent network
Bruyninx C., Roosbeek F.
Reports on Geodesy
|
2001
|
z. 3/58
9-15
9
Content available remote LAC analysis centre report: LPT
Brockmann E., Wiget A.
Reports on Geodesy
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2001
|
z. 3/58
23-27
10
Content available remote GPS data analysis at the ROB EUREF local analysis centre
Roosbeek F., Bruyninx C.
Reports on Geodesy
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2001
|
z. 3/58
73-80
11
Content available remote Cost action 716 and the EUREF permanent network
Marel H., Weber G.
Reports on Geodesy
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2001
|
z. 3/58
143-147
12
Content available remote ASI-CGS analysis centre report
Ferraro C., Vespe F.
Reports on Geodesy
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2001
|
z. 3/58
48-53
13
Content available remote Analysis by DEOS of the SW part of the EUREF network
Fernandes R., Ambrosius B.
Reports on Geodesy
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2001
|
z. 3/58
35-42
EN
The Delft Institute for Earth-Oriented Space Research (DEOS) has become an official Local Analysis Center (LAC) of the European Permanent Network (EUREF) in GPS week 1100 (04-February-2001). Currently, the analysis is focused on a sub-network of 23 GPS stations located in the SW part of the EUREF network. DEOS is the only LAC using the GIPSY software to process the GPS data. This software developed at the Jet Propulsion Laboratory (JPL), considers undifferenced data to estimate corrections to satellite and receiver clocks, differently from other software packages (e.g. BERNESE and GAMIT) which use the more common "baseline approach".
14
Content available remote Alpine network
Brockmann E., Calais E., Nocquet J., Caporali A., Vespe F., Weber G., Weber R., Stangl G.
Reports on Geodesy
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2001
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z. 3/58
91-100
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