Zobrazeno 1 - 10
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pro vyhledávání: '"Drazen Svehla"'
Autor:
Drazen Svehla
We propose observing GNSS satellites with VLBI operationally in the celestial frame. Basically, the terrestrial frame is fully determined only by the GNSS satellites and the celestial frame is based on the VLBI with AGNs. To combine these two fully i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::00e5e725aaa74554152e7f9bd0e368c8
Autor:
Drazen Svehla
In order to increase the accuracy of precise orbit determination for a single satellite or satellites in LEO formation, we propose using a LEO-to-GNSS laser interferometer, what we call a “laser GNSS receiver”, to measure the Doppler shift with a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5ce2078f093af74c19e3f887e931fe8
https://doi.org/10.5194/egusphere-egu23-11867
https://doi.org/10.5194/egusphere-egu23-11867
Autor:
Drazen Svehla
At the last EGU and AGU conferences, we have proposed and demonstrated the feasibility of a laser GNSS receiver in the LEO orbit in order to provide carrier-phase measurements on a CW laser between a LEO satellite and GNSS satellites equipped with SL
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f9492361bb5ca9060105863629681ac
https://doi.org/10.5194/egusphere-egu22-12288
https://doi.org/10.5194/egusphere-egu22-12288
Autor:
Drazen Svehla
Precise orbit determination (POD) of LEO satellites is done with a geodetic grade GPS receiver measuring carrier-phase between a LEO and GPS satellites, and in some cases this is supported with a DORIS instrument measuring Doppler between LEO and gro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1191440814f23cb1ab8c6b3146d85758
https://doi.org/10.5194/egusphere-egu21-9072
https://doi.org/10.5194/egusphere-egu21-9072
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
Galileo is the first GNSS system equipped with a highly stable H-maser. In this section we conduct a comprehensive analysis of the performance of the Passive H-Maser (PHM) used as a primary clock on board Galileo navigation satellites. PHM ground tes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30a7c39e6b7a63a4e5f57070e0682a61
https://doi.org/10.1007/978-3-319-76873-1_18
https://doi.org/10.1007/978-3-319-76873-1_18
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
Here we present the results of reduced-kinematic POD, as introduced and published in Svehla and Rothacher (2005). Reduced-kinematic POD can be defined as the fourth fundamental approach in precise orbit determination, along with kinematic, reduced-dy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0f6e2807ab312e894c9d75fe41254ab
https://doi.org/10.1007/978-3-319-76873-1_7
https://doi.org/10.1007/978-3-319-76873-1_7
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
Here we present a novel SLR double-difference approach with GNSS satellites. It is shown how forming double-differences of SLR measurements between Herstmonceux (HERL) and Graz (GRZL) ILRS stations and two Galileo satellites removes common SLR biases
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40ea8c5ff386237e429e2e232fd3d483
https://doi.org/10.1007/978-3-319-76873-1_17
https://doi.org/10.1007/978-3-319-76873-1_17
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
Here we discuss the kinematic equation of a satellite orbit based on a circular representation of the velocity vectors of a Kepler orbit, otherwise known as the two-body problem in celestial mechanics. The velocity vector for Keplerian orbit describe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f07eda9b9bd852a1c8d2cfc0c28bd45e
https://doi.org/10.1007/978-3-319-76873-1_25
https://doi.org/10.1007/978-3-319-76873-1_25
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
To use the dynamics of GPS satellites to complement geometrical Earth rotation and orientation parameters from VLBI has always been a challenge. Geometric VLBI differs from other space geodesy techniques, such as GNSS, SLR and DORIS, in that it does
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42541f147148d730567b507bfcc84a93
https://doi.org/10.1007/978-3-319-76873-1_28
https://doi.org/10.1007/978-3-319-76873-1_28
Autor:
Drazen Svehla
Publikováno v:
Geometrical Theory of Satellite Orbits and Gravity Field ISBN: 9783319768724
To use atomic clocks for the in situ determination of differences in the gravitational potential of the Earth’s gravity field was proposed for the first time by Bjerhammar (1985), Vermeer (1983), taking up Einstein’s postulation that two atomic c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15410333b51804284619ba63f401f533
https://doi.org/10.1007/978-3-319-76873-1_29
https://doi.org/10.1007/978-3-319-76873-1_29