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## Intervals to Update the Data of the Moon, the Sun and Planet Positions for the Ephemeris Support of the GLONASS System

Transactions of IAA RAS, issue 42, 57–63 (2017)

Keywords: ephemerides of the Moon, the Sun and planets, ephemeris support of the GLONASS system, navigational satellite ephemerides, navigation equipment.

### Abstract

The GLONASS system requires that its ephemeris support includes the data about the positions of the bodies which disturb the orbits of navigational satellites. The current ephemerides of the Moon, the Sun and the planets are DE/LE (USA), INPOP (France) and EPM (Russia). All of them have the accuracy necessary to predict the ephemerides of navigational satellites of the Earth, including the GLONASS satellites. The ephemeris data are presented in the form of files with coefficients of Chebyshev approximating polynomials for the coordinates and velocities of the planets, the Sun and the Moon. However, each realization of these ephemerides is calculated using a fixed set of observational data and loses in accuracy of the coordinates of the perturbing bodies outside the observational interval. The speed of the accuracy degradation in the Moon, the Sun and the planets’ positions is compared in a few DE/LE versions. The intervals between updates of the ephemeris of the Moon, the Sun and the planets are recommended for the GLONASS support and autonomous orbit determination of the navigation satellites.

### Citation

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M. V. Vasilyev, E. I. Yagudina. Intervals to Update the Data of the Moon, the Sun and Planet Positions for the Ephemeris Support of the GLONASS System // Transactions of IAA RAS. — 2017. — Issue 42. — P. 57–63. @article{vasilyev2017, abstract = {The GLONASS system requires that its ephemeris support includes the data about the positions of the bodies which disturb the orbits of navigational satellites. The current ephemerides of the Moon, the Sun and the planets are DE/LE (USA), INPOP (France) and EPM (Russia). All of them have the accuracy necessary to predict the ephemerides of navigational satellites of the Earth, including the GLONASS satellites. The ephemeris data are presented in the form of files with coefficients of Chebyshev approximating polynomials for the coordinates and velocities of the planets, the Sun and the Moon. However, each realization of these ephemerides is calculated using a fixed set of observational data and loses in accuracy of the coordinates of the perturbing bodies outside the observational interval. The speed of the accuracy degradation in the Moon, the Sun and the planets’ positions is compared in a few DE/LE versions. The intervals between updates of the ephemeris of the Moon, the Sun and the planets are recommended for the GLONASS support and autonomous orbit determination of the navigation satellites.}, author = {M.~V. Vasilyev and E.~I. Yagudina}, issue = {42}, journal = {Transactions of IAA RAS}, keyword = {ephemerides of the Moon, the Sun and planets, ephemeris support of the GLONASS system, navigational satellite ephemerides, navigation equipment}, pages = {57--63}, title = {Intervals to Update the Data of the Moon, the Sun and Planet Positions for the Ephemeris Support of the GLONASS System}, url = {http://iaaras.ru/en/library/paper/1745/}, year = {2017} } TY - JOUR TI - Intervals to Update the Data of the Moon, the Sun and Planet Positions for the Ephemeris Support of the GLONASS System AU - Vasilyev, M. V. AU - Yagudina, E. I. PY - 2017 T2 - Transactions of IAA RAS IS - 42 SP - 57 AB - The GLONASS system requires that its ephemeris support includes the data about the positions of the bodies which disturb the orbits of navigational satellites. The current ephemerides of the Moon, the Sun and the planets are DE/LE (USA), INPOP (France) and EPM (Russia). All of them have the accuracy necessary to predict the ephemerides of navigational satellites of the Earth, including the GLONASS satellites. The ephemeris data are presented in the form of files with coefficients of Chebyshev approximating polynomials for the coordinates and velocities of the planets, the Sun and the Moon. However, each realization of these ephemerides is calculated using a fixed set of observational data and loses in accuracy of the coordinates of the perturbing bodies outside the observational interval. The speed of the accuracy degradation in the Moon, the Sun and the planets’ positions is compared in a few DE/LE versions. The intervals between updates of the ephemeris of the Moon, the Sun and the planets are recommended for the GLONASS support and autonomous orbit determination of the navigation satellites. UR - http://iaaras.ru/en/library/paper/1745/ ER -