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Precise geodetic and hydrographic measurements in Karst areas

Pribičević B., Medak D., Dapo A.

Reports on Geodesy

2008

z. 1/84

55-59

Recent advances in GPS-technology (GNSS) enable hydrographic surveyors to capture the topography of the bottom and the water surface with even more accuracy. Faculty of Geodesy, University of Zagreb, recently acquired the latest technology for performing the precise hydrographic surveying: Trimble R8 GNSS receiver that is going to be used with already used echo sounding equipment. The GSM signals are used for transmitting corrections from the base station to the rover. Thus, it is possible to use single-frequency DESO 14 for two-frequencies bathymetry through repeating the course of the vessel on exactly the same points with both transducers. It is expected that the new technology shall yield more accurate results and increase measurement speed, because the OTF times should be significantly shortened.

Correlation characteristic of GPS/DGPS measurements

Banachowicz A., Banachowicz G., Bober R., Szewczuk T., Wolski A.

Reports on Geodesy

2008

z. 1/84

41-47

GPS signals are of time-spatial nature. And they should be modeled as such in the algorithms for establishing navigational measurements. Therefore, they should be treated as stochastic processes. This article prcsents the results of testing the correlation properties of GPS/DGPS signals. Several measurement series were carried out to obtain position co-ordinates at various times and in various points as well as synchronous measurements of two GPS/DGPS receivers. The tests aimed at identifying the function of auto-correlation between and co-ordinates and the function of intercorrelation between and coordinates. As it turns out, these measurements are significantly correlated, and the mean time of correlation is within the range of a couple or more minutes.

Geokinematics of Central Europe: new insights from CERGOP-2/Environment Project

Caporali A., Becker M., Fejes I., Gerhatova L., Ghitau D., Grenerczy G., Hefty J., Medac D., Milev G., Mojzes M., Mulic M.

Reports on Geodesy

2007

z. 2/83

7-46

The CERGOP2 project funded by the European Union from 2003 to 2006 under the 5th Framework Programme benefits from repeated measurements of the coordinates of epoch and permanent GPS stations forming the CEGRN network in Central Europe, starting 1994. We report on the results of the systematic processing of the available data up to 2005. The analysis work has yielded the velocities of some 60 sites, covering a variety of Central European tectonic provinces, from the Adria indenter to the Tauern window, the Pannonian basin, the Vrancea Seismic Zone and the Carpathian Mountains. The estimated velocities define kinematical patterns which outline, with varying spatial resolution depending on the station density and history, the present day tectonic flow in Central Europe.The CEGRN data show that the majority of active contraction originating from the Eurasia Nubia plate boundary and the microplate between them is taken up primarily in the Eastern Alps, the Dinarides, and the Pannonian Basin. After removal from the ITRF2000 velocities of a rigid rotation accounting for the mean motion of stable Europe, the residual velocities have random orientations with 0.3 mm/yr scatter. This Iow figure provides an upper estimate for the level of rigidity of the European Platform. A 2.3 mm/yr north-south oriented convergence rate is implied by our data between Adria and the Southern Alps, and a narrow - -60 km wide- contraction zone in the Southern Alps is identified, consistently with earlier results. An eastward extrusion north of the contraction zone corresponds with the extension of the Tauern Window. In the southeastern boundary of the microplate, 4-4.5 mm/yr motion of Adria decreases to -1 mm/yr through the microplate, its boundary, and the Dinarides mountain range towards the southwestern part of the Pannonian Basin. Our data suggest that if the Pannonian Basin is subject to deformation, then it is most likely to be compressional than extensional. We conclude that compression and associated contraction due to the Adria collision with the Alps and the Dinarides is likely to fade away in the Western and Northern Carpathians, where our velocities and strain rates show no significant deformation.