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Article

Galileo L10 Satellites: Orbit, Clock and Signal-in-Space Performance Analysis

1
Finnish Geospatial Research Institute, National Land Survey of Finland, 02430 Masala, Finland
2
Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, 412 96 Göteborg, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Jari Nurmi
Sensors 2021, 21(5), 1695; https://doi.org/10.3390/s21051695
Received: 5 February 2021 / Revised: 17 February 2021 / Accepted: 22 February 2021 / Published: 1 March 2021
The tenth launch (L10) of the European Global Navigation Satellite System Galileo filled in all orbital slots in the constellation. The launch carried four Galileo satellites and took place in July 2018. The satellites were declared operational in February 2019. In this study, we report on the performance of the Galileo L10 satellites in terms of orbital inclination and repeat period parameters, broadcast satellite clocks and signal in space (SiS) performance indicators. We used all available broadcast navigation data from the IGS consolidated navigation files. These satellites have not been reported in the previous studies. First, the orbital inclination (56.7±0.15°) and repeat period (50680.7±0.22 s) for all four satellites are within the nominal values. The data analysis reveals also 13.5-, 27-, 177- and 354-days periodic signals. Second, the broadcast satellite clocks show different correction magnitude due to different trends in the bias component. One clock switch and several other minor correction jumps have occurred since the satellites were declared operational. Short-term discontinuities are within ±1 ps/s, whereas clock accuracy values are constantly below 0.20 m (root-mean-square—rms). Finally, the SiS performance has been very high in terms of availability and accuracy. Monthly SiS availability has been constantly above the target value of 87% and much higher in 2020 as compared to 2019. Monthly SiS accuracy has been below 0.20 m (95th percentile) and below 0.40 m (99th percentile). The performance figures depend on the content and quality of the consolidated navigation files as well as the precise reference products. Nevertheless, these levels of accuracy are well below the 7 m threshold (95th percentile) specified in the Galileo service definition document. View Full-Text
Keywords: Galileo; satellite; orbit; inclination; repeat time; clock; bias; signal-in-space; availability; accuracy Galileo; satellite; orbit; inclination; repeat time; clock; bias; signal-in-space; availability; accuracy
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MDPI and ACS Style

Andrei, C.-O.; Lahtinen, S.; Poutanen, M.; Koivula, H.; Johansson, J. Galileo L10 Satellites: Orbit, Clock and Signal-in-Space Performance Analysis. Sensors 2021, 21, 1695. https://doi.org/10.3390/s21051695

AMA Style

Andrei C-O, Lahtinen S, Poutanen M, Koivula H, Johansson J. Galileo L10 Satellites: Orbit, Clock and Signal-in-Space Performance Analysis. Sensors. 2021; 21(5):1695. https://doi.org/10.3390/s21051695

Chicago/Turabian Style

Andrei, Constantin-Octavian, Sonja Lahtinen, Markku Poutanen, Hannu Koivula, and Jan Johansson. 2021. "Galileo L10 Satellites: Orbit, Clock and Signal-in-Space Performance Analysis" Sensors 21, no. 5: 1695. https://doi.org/10.3390/s21051695

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