Results 171 to 180 of about 1,122,620 (213)
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Efficiency of precise point positioning in Peninsular Malaysia from an ephemeris perspective
AIP Conference Proceedings, 2023Hong Sheng Lee +3 more
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Precise Timings of Galilean Satellite Eclipses and Assessment of the E5 Ephemeris
Icarus, 2000 Anthony Mallama
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Analyzing the Precision of Chebyshev Polynomial Fitting GPS Satellite Ephemeris
Applied Mechanics and Materials, 2013Using Chebyshev polynomial to fit precise ephemeris of GPS, the nodes selection has a certain influence on the precision. In this paper we use 3 kinds of precise ephemeris ( IGF, IGR, IGU ) to analyze the difference precision of randomly selected interpolation node and Chebyshev points fitting orbit and compare the difference and precision of fitting ...
Li Long Liu +2 more
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Assessment of precise GPS ephemeris and clock in the International GNSS service
IEEE/ION Position, Location and Navigation Symposium, 2010Currently many vessels determine an overhead clearance by a rule of thumb based on their draft for maritime navigation. Therefore when vessels navigate, they don't have a good overhead clearance because vertical position of vessels varies on time by tidal.
Deuk Jae Cho +2 more
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Research on BDS/GPS High-precision Long-period Ephemeris Extrapolation Technology
2021 IEEE 4th International Conference on Electronic Information and Communication Technology (ICEICT), 2021In order to improve the surface satellite positioning efficiency of the underwater vehicle, a simple and efficient high-precision long-period ephemeris extrapolation technology method is proposed to solve the problem of too long time for the first satellite positioning of the submarine after a long underwater navigation.
Teng Lv, Jun Fu
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2012 IEEE First AESS European Conference on Satellite Telecommunications (ESTEL), 2012
In the frame of a simulation facility developed for the Italian Space Agency (ASI) and the Air Navigation Services company (ENAV), Telespazio handled the problem of generating the Precision Ephemeris (PE) parameter sets for a simulated Galileo constellation.
Stefano Lagrasta, F. Malvolti, R. Marson
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In the frame of a simulation facility developed for the Italian Space Agency (ASI) and the Air Navigation Services company (ENAV), Telespazio handled the problem of generating the Precision Ephemeris (PE) parameter sets for a simulated Galileo constellation.
Stefano Lagrasta, F. Malvolti, R. Marson
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Precision Analysis of CNAV Broadcast Ephemeris and Its Impact on the User Positioning
2017GPS broadcast ephemeris error is an important factor affecting the real-time positioning accuracy. Since April 2014, the IGS provided two new broadcast ephemeris products, namely LNAV (Legacy Navigation Message) and CNAV (Civil Navigation Message). Compared with LNAV, CNAV was broadcasted only on Block IIR-M and IIF satellites.
Junping Chen, Ahao Wang, Jiexian Wang
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Journal of Geophysical Research: Solid Earth, 1993
Perturbations of Earth rotation are currently observed as time variations of universal time UT1‐UTC and as changes in the terrestrial and the celestial orientation of the axis of the celestial ephemeris pole (CEP) as expressed by five Earth orientation parameters (EOP).
Nicole Capitaine, Aleksander Brzeziński
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Perturbations of Earth rotation are currently observed as time variations of universal time UT1‐UTC and as changes in the terrestrial and the celestial orientation of the axis of the celestial ephemeris pole (CEP) as expressed by five Earth orientation parameters (EOP).
Nicole Capitaine, Aleksander Brzeziński
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GPS positioning accuracy using precise real‐time ephemeris and clock correction
Marine Geodesy, 1994Global positioning system (GPS) has found applications in various areas including marine geodesy. GPS positioning accuracy, however, is greatly degraded by GPS ephemeris and clock errors, particularly errors due to Selective Availability (SA). Thus, it is crucial to use precise ephemeris and clock corrections for users who require high position ...
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