| ... | ... | @@ -7,10 +7,12 @@ An ephemeris for a satellite is a precise set of data that describes the satelli |
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This information is sufficient to calculate the position and velocity of the satellite at any time, given the right software and techniques. Since the satellite's orbit is constantly changing due to various factors such as gravitational pull, atmospheric drag, etc., ephemerides are typically issued in batches, covering a period of a few days to a few weeks, and updated regularly to reflect these changes.
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Here is an example of ephemeris datas :
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_Here is an example of ephemeris datas :_
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[](https://www.lavionnaire.fr/InstNavigGPS.php#GPSSignauxSat)
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It is important to note that ephemerides are issued with an associated accuracy, which is the level of precision with which the ephemeris predicts the satellite's position and velocity. This accuracy can depend on many factors, such as the quality of the observations used to create the ephemeris, the level of knowledge of the satellite's orbit, and the level of precision of the software used to generate the ephemeris.
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Sources :
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Vioux, D. , L'avionnaire, [https://www.lavionnaire.fr/InstNavigGPS.php#GPSSignauxSat](https://www.lavionnaire.fr/InstNavigGPS.php#GPSSignauxSat) |
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- Vioux, D. , L'avionnaire, [https://www.lavionnaire.fr/InstNavigGPS.php#GPSSignauxSat](https://www.lavionnaire.fr/InstNavigGPS.php#GPSSignauxSat)
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- Gingerich, Owen (2017). Arias, Elisa Felicitas; Combrinck, Ludwig; Gabor, Pavel; Hohenkerk, Catherine; Seidelmann, P. Kenneth (eds.). "The Role of Ephemerides from Ptolemy to Kepler". The Science of Time 2016. Astrophysics and Space Science Proceedings. Cham: Springer International Publishing. 50: 17–24. |
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