scholarly journals Mean Orbital Motion of Geodetic Satellites and its Applications

1997 ◽  
Vol 165 ◽  
pp. 332-340
Author(s):  
P. Exertier ◽  
G. Métris ◽  
S. Bruinsma ◽  
F. Barlier
Keyword(s):  
Orbital Motion ◽  
Temporal Variations ◽  
Artificial Satellites ◽  
Tracking Data ◽  
Mission Analysis ◽  
Averaging Methods ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth ◽  
The Mean

AbstractAveraging methods are convenient tools for studying long-periodic variations of the motion of artificial satellites. The main lines of a semi-analytical theory of the mean motion are given. We show how, when coupled with a careful reduction of the tracking data, this theory allows to determine parameters related to the temporal variations of the Earth gravity field (e.g. the amplitude of 18.6 years tide and the secular variation of even zonal harmonics). The theory is also very useful for other applications such as mission analysis.

scholarly journals Effect of the Gravitational Aberration on the Earth Gravity Field

2021 ◽  
Vol 56 (1) ◽  
pp. 1-9
Author(s):  
Janusz B. Zieliński ◽  
Vladimir V. Pashkevich
Keyword(s):  
Gravity Field ◽  
Orbit Determination ◽  
Artificial Satellites ◽  
Finite Speed ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth ◽  
First Approximation ◽  
Classic Theory

Abstract Discussing the problem of the external gravitational potential of the rotating Earth, we have to consider the fundamental postulate of the finite speed of the propagation of gravitation. This can be done using the expressions for the gravitational aberration compared to the Liénard–Wiechert solution of the retarded potentials. The term gravitational counter-aberration or co-aberration is introduced to describe the pattern of the propagation of the gravitational signal emitted by the rotating Earth. It is proved that in the first approximation, the classic theory of the aberration of light can be applied to calculate this effect. Some effects of the gravitational aberration on the external gravity field of the rotating Earth may influence the orbit determination of the Earth artificial satellites.

MOCASS: A Satellite Mission Concept Using Cold Atom Interferometry for Measuring the Earth Gravity Field

2019 ◽  
Vol 40 (5) ◽  
pp. 1029-1053 ◽  
Author(s):  
Federica Migliaccio ◽  
Mirko Reguzzoni ◽  
Khulan Batsukh ◽  
Guglielmo Maria Tino ◽  
Gabriele Rosi ◽  
...  
Keyword(s):  
Gravity Field ◽  
Cold Atom ◽  
Atom Interferometry ◽  
Satellite Mission ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth

Reply to the Comment on ‘Evaluation of the local value of the Earth gravity field in the context of the new definition of the kilogram’

Metrologia ◽  
2010 ◽  
Vol 47 (3) ◽  
pp. 341-342
Author(s):  
H Baumann ◽  
E E Klingelé ◽  
A L Eichenberger ◽  
B Jeckelmann ◽  
P Richard
Keyword(s):  
Gravity Field ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth ◽  
Definition Of ◽  
Local Value

Global measurement of the Earth gravity field using a gradiometric satellite

1983 ◽  
Vol 10 (9) ◽  
pp. 599-607 ◽  
Author(s):  
J.J. Runavot ◽  
C. Bouzat ◽  
A. Bernard ◽  
B. Sacleux
Keyword(s):  
Gravity Field ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth

scholarly journals Quality of Orbit Predictions for Satellites Tracked by SLR Stations

2021 ◽  
Vol 13 (7) ◽  
pp. 1377
Author(s):  
Joanna Najder ◽  
Krzysztof Sośnica
Keyword(s):  
Extreme Case ◽  
Laser Ranging ◽  
Artificial Satellites ◽  
Satellite Orbits ◽  
Satellite Systems ◽  
Quality Degradation ◽  
The Earth ◽  
The Mean ◽  
Over Time

This study aims to evaluate and analyze the orbit predictions of selected satellites: geodetic, Global Navigational Satellite Systems (GNSS), and scientific low-orbiting, which are tracked by laser stations. The possibility of conducting satellite laser ranging (SLR) to artificial satellites depends on the access to high-quality predictions of satellite orbits. The predictions provide information to laser stations where to aim the telescope in search of a satellite to get the returns from the retroreflectors installed onboard. If the orbit predictions are very imprecise, SLR stations must spend more time to correct the telescope pointing, and thus the number of collected observations is small or, in an extreme case, there are none of them at all. Currently, there are about 120 satellites equipped with laser retroreflectors orbiting the Earth. Therefore, the necessity to determine the quality of predictions provided by various analysis centers is important in the context of the increasing number of satellites tracked by SLR stations. We compare the orbit predictions to final GNSS orbits, precise orbits of geodetic satellites based on SLR measurements determined in postprocessing, and kinematic orbits of low-orbiting satellites based on GPS data. We assess the quality degradation of the orbit predictions over time depending on the type of orbit and the satellite being analyzed. We estimate the time of usefulness of prediction files, and indicate those centers which publish most accurate predictions of the satellites’ trajectories. The best-quality predictions for geodetic satellites and Galileo reach the mean error of 0.5–1 m for the whole 5-day prediction file (for all three components), while the worst ones can reach values of up to several thousand meters during the first day of the prediction.

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