Results 191 to 200 of about 1,106,314 (231)

Research on BDS/GPS High-precision Long-period Ephemeris Extrapolation Technology

2021 IEEE 4th International Conference on Electronic Information and Communication Technology (ICEICT), 2021
In 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.
Jun Fu, Teng Lv
openaire   +1 more source

Precise Seasat ephemeris from laser and altimeter data

Advances in Space Research, 1985
Abstract The determination of a precise Seasat ephemeris has required improvements in the modeling of the gravitational and nongravitational forces acting on the satellite. Because laser range data were used as the primary ground-based tracking measurement, the limited data distribution in July and August, 1978, necessitated the use of other data to ...
B.E. Schutz, B.D. Tapley, C.K. Shum
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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, 2013
Using 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 ...
Shao Feng Xie, Peng Fei Zhang, Li Long Liu   +2 more
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High-precision analytical representation of lunar ephemeris

Doklady Physics, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Assessment of precise GPS ephemeris and clock in the International GNSS service

IEEE/ION Position, Location and Navigation Symposium, 2010
Currently 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, Ho Cheol Jeong, Sang Hyun Park   +2 more
openaire   +1 more source

GPS positioning accuracy using precise real‐time ephemeris and clock correction

Marine Geodesy, 1994
Global 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 ...
openaire   +1 more source

Ephemeris-Based Sum Capacity Enhancement in Multi-Satellite Communication Systems

IEEE Transactions on Vehicular Technology
This paper investigates the downlink (DL) sum capacity of multi-satellite communication systems with a large number of low earth orbit (LEO) satellites.
Hanwoong Kim, Hyunwoo Lee, Jehyun Heo, J. Bang, Daesik Hong   +4 more
semanticscholar   +1 more source

Updating the Ephemeris and Physical Properties of Five Long-period Transiting Exoplanets Using TESS and CHEOPS

Monthly notices of the Royal Astronomical Society
The transiting long-period exoplanets are the most interesting follow-up targets for the next-generation instruments, using the most sophisticated observational techniques.
Suman Saha
semanticscholar   +1 more source

Computation of Precision Ephemeris coefficients in the GNSS message: Practical results from a proficient algorithm

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.
R. Marson, S. Lagrasta, F. Malvolti
openaire   +1 more source