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    Wyświetlanie 1-10 z 10
    Tytuł:
    Geo-kinematics of Central Europe inferred from long-term monitored regional and local GPS networks
    Autorzy:
    Hefty, J.
    Tematy:
    Europa Środkowa
    sieci GPS
    pole prędkości
    geokinematyka
    Central Europe
    GPS networks
    velocity field
    geokinematics
    Pokaż więcej
    Data publikacji:
    2008
    Powiązania:
    https://bibliotekanauki.pl/articles/225133.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2008, z. 2/85; 9-18
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of detection of seismic displacements in Central Europe by analysis of high-rate GPS
    Autorzy:
    Hefty, J.
    Gerhátová, L.
    Tematy:
    przemieszczenia sejsmiczne
    pomiary geodezyjne
    Europa Centralna
    seismic displacement
    surveying
    Precise Point Positioning
    PPP
    Central Europe
    Pokaż więcej
    Data publikacji:
    2012
    Powiązania:
    https://bibliotekanauki.pl/articles/224766.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2012, z. 2/93; 25-33
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Opis:
    The Precise Point Positioning (PPP) analysis technique adapted for monitoring of high - rate coordinate variations from GPS observations is applied for detection of actual displacements related to moderate and light earthquakes. Two approaches are examined: kinematic PPP which is suitable for larger displacements and analysis of residuals from quasi-static PPP which is suitable for detection of min or earthquake related displacements. The potential and limits of the se used methods are documented on M 6.3 L’Aquila earthquake and M 4.3 Tatabanya earthquake. Our experiments proved the ability to measure dynamic seismic-related short-term coordinate variations at sub-centimetre level with PPP using GPS 1 Hz satellites observations.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multipath detection with the combination of SNR measurements – Example from urban environment
    Autorzy:
    Špánik, P.
    Hefty, J.
    Tematy:
    satelita nawigacyjny
    fala radiowa
    pomiar szumu
    multipath
    detection
    SNR
    three-frequency combination
    GNSS positioning
    Pokaż więcej
    Data publikacji:
    2017
    Powiązania:
    https://bibliotekanauki.pl/articles/145370.pdf  Link otwiera się w nowym oknie
    Źródło:
    Geodesy and Cartography; 2017, 66, 2; 305-315
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Opis:
    Multipath is one of the most severe station-dependent error sources in both static and kinematic positioning. Relatively new and simple detection technique using the Signal-to-Noise (SNR) measurements on three frequencies will be presented based on idea of Strode and Groves. Exploitation of SNR measurements is benefi cial especially for their unambiguous character. Method is based on the fact that SNR values are closely linked with estimation of pseudo-ranges and phase measurements during signal correlation processing. Due to this connection, combination of SNR values can be used to detect anomalous behavior in received signal, however some kind of calibration in low multipath environment has to be done previously. In case of multipath, phase measurements on different frequencies will not be affected in the same manner. Specular multipath, e.g. from building wall introduces additional path delay which is interpreted differently on each of the used carrier, due to different wavelengths. Experimental results of multipath detection in urban environment will be presented. Originally proposed method is designed to work with three different frequencies in each epoch, thus only utilization of GPS Block II-F and Galileo satellites is possible. Simplification of detection statistics to use only two frequencies is made and results using GPS and GLONASS systems are presented along with results obtained using original formula.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geokinematical implications inferred from analysis of permanent stations in Central European region
    Autorzy:
    Hefty, J.
    Igondova, M.
    Tematy:
    stacje trwałe
    wysokość elipsoidalna
    wysokość geodezyjna
    prędkości pionowe
    prędkości poziome
    permanent stations
    ellipsoidal height
    vertical velocities
    horizontal velocities
    velocity estimations
    Pokaż więcej
    Data publikacji:
    2006
    Powiązania:
    https://bibliotekanauki.pl/articles/224545.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2006, z. 1/76; 29-38
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Opis:
    GPS permanent stations situated in Central Europe region are systematically analyzed in order to investigate behaviour of long-term monitoring of horizontal position and ellipsoidal height. On the basis of data from more than 30 sites the quality of the station is evaluated. Stability of station is measured by variety of parameters: jumps and discontinuities of known but also of unknown origin, seasonal variations amplitudes and phases and diurnal coordinate variations. We estimate for each network station its main deterministic characteristics including identification of eventual jumps, their time of occurrence and magnitude, annual variations and site velocities. The set of criteria for defining "stable" permanent station is proposed.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short-term and long-term variability of antenna position due to thermal bending of pillar monument at permanent GNSS station
    Autorzy:
    Gerhatova, L.
    Hefty, J.
    Spanik, P.
    Tematy:
    precise inclination sensor observations
    GNSS monument instability
    thermal deformations
    obserwacje
    czujnik pochylenia
    GNSS
    odkształcenia termiczne
    Pokaż więcej
    Data publikacji:
    2016
    Powiązania:
    https://bibliotekanauki.pl/articles/106753.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy and Geoinformatics; 2016, 100; 67-77
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Opis:
    The variability of daily site coordinates at permanent GNSS station is a sum of many disturbing factors influencing the actual satellite observations, data processing, and bias modelling. In the paper are analysed possibilities of monitoring the instability of GNSS antenna pillar monument by the independent observations using the precise inclination sensor. Long-term series from three different types of pillars show specific features in amplitude and temporal evolution of monument bending. Correlations with daily temperature and/or solar radiation changes were proved.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refinement of the velocity field in Central Europe based on reprocessed permanent and epoch-wise GPS observations
    Autorzy:
    Hefty, J.
    Gerhatova, L.
    Hipmanova, L.
    Igondova, M.
    Droscak, B.
    Tematy:
    pomiary GPS
    GPS measurements
    Pokaż więcej
    Data publikacji:
    2011
    Powiązania:
    https://bibliotekanauki.pl/articles/224914.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2011, z. 2/91; 19-28
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Opis:
    The history of regular GPS monitoring aimed to investigation of geokinematics in Central Europe started in early ninetieth of the 20th century. In 1994 the first campaign of epoch-wise Central Europe Geodynamics Project (CERGOP) was organized and serval pernament GPS stations in region became operational; relevant data from about 30 sites are available for that period. Since that time the number of permanent and epoch stations with accessible suitable for geokinematical research increased to about 150. Although the GPS observations were continuously analyzed and also several re-analyses were performed, the complex combination of all data still suffer fromb inhomogeneities of various kind, e.g. no unique GPS antenne models, effects of reference fram evolution, troposphere models improvements, identyfication and modeling of discontinuities in observing series, etc. In this paper is introduced a new complex solutions for 3-dimensional site velocities which is based on GPS permanent and epoch data reprocessed by unified procedures and models related to homogeneous reference frame. The subsequent horizontal velocity field analyses are focused on modelling of regional geokinematical trends and identification of local anomalies where the significant disagreement of the actual site velocity with the regional pattern is observed.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish astro-geodetic geoid - final results
    Autorzy:
    Rogowski, J. B.
    Barlik, M.
    Bogusz, J.
    Hefty, J.
    Kłęk, M.
    Kujawa, L.
    Tematy:
    niwelacja astronomiczno-geodezyjna
    astrometria
    grawimetria
    astro-geodetic levelling
    astrometry
    gravimetry
    Pokaż więcej
    Data publikacji:
    2006
    Powiązania:
    https://bibliotekanauki.pl/articles/224495.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2006, z. 1/76; 119-128
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of CEGRN 2005 as the eighth of CERGOP observing campaigns
    Autorzy:
    Hefty, J.
    Gerhatova, L.
    Stangl, G.
    Haslinger, C.
    Krauss, S.
    Becker, M.
    Drescher, R.
    Grenerczy, G.
    Kratochvil, R.
    Liwosz, T.
    Tematy:
    CERGOP
    CEGRN
    obserwacje geodezyjne
    Central European Regional Geodynamic Project
    geodetic observation
    Pokaż więcej
    Data publikacji:
    2006
    Powiązania:
    https://bibliotekanauki.pl/articles/224554.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2006, z. 1/76; 39-46
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Opis:
    Strategy of analysis and results from solution of CEGRN epoch campaign in 2005 Combined solution of CEGRN 2005 based or individual solutions from six an: centres and its comparison with CEGRN 2003 coordinates. Time evolution of coordinates at some long-term observed CEGRN sites obtained during epoch camp since 1994 and the related problems.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geokinematics of Central Europe: new insights from CERGOP-2/Environment Project
    Autorzy:
    Caporali, A.
    Becker, M.
    Fejes, I.
    Gerhatova, L.
    Ghitau, D.
    Grenerczy, G.
    Hefty, J.
    Medac, D.
    Milev, G.
    Mojzes, M.
    Mulic, M.
    Tematy:
    GPS
    geodezja
    geodynamika w Europie Centralnej
    tektonika w Europie Centralnej
    naprężenia i odształcenia w Europie Środkowej
    GPS Geodesy
    Central European Geodynamics
    Central European Tectonics
    Stress and Strain in Central Europe
    Pokaż więcej
    Data publikacji:
    2007
    Powiązania:
    https://bibliotekanauki.pl/articles/224596.pdf  Link otwiera się w nowym oknie
    Źródło:
    Reports on Geodesy; 2007, z. 2/83; 7-46
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Opis:
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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