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Signal in Space Error and Ephemeris Validity Time Evaluation of Milena and Doresa Galileo Satellites

Department of Engineering, Parthenope University of Naples, 80143 Napoli, Italy
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This paper is an extended version of our paper published in the 2018 IEEE International Workshop on Metrology for the Sea proceedings entitled “Accuracy evaluation of Doresa and Milena Galileo satellites broadcast ephemeris”.
Sensors 2019, 19(8), 1786; https://doi.org/10.3390/s19081786
Received: 14 March 2019 / Revised: 9 April 2019 / Accepted: 11 April 2019 / Published: 14 April 2019
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Abstract

In August 2016, Milena (E14) and Doresa (E18) satellites started to broadcast ephemeris in navigation message for testing purposes. If these satellites could be used, an improvement in the position accuracy would be achieved. A small error in the ephemeris would impact the accuracy of positioning up to ±2.5 m, thus orbit error must be assessed. The ephemeris quality was evaluated by calculating the SISEorbit (in orbit Signal In Space Error) using six different ephemeris validity time thresholds (14,400 s, 10,800 s, 7200 s, 3600 s, 1800 s, and 900 s). Two different periods of 2018 were analyzed by using IGS products: DOYs 52–71 and DOYs 172–191. For the first period, two different types of ephemeris were used: those received in IGS YEL2 station and the BRDM ones. Milena (E14) and Doresa (E18) satellites show a higher SISEorbit than the others. If validity time is reduced, the SISEorbit RMS of Milena (E14) and Doresa (E18) greatly decreases differently from the other satellites, for which the improvement, although present, is small. Milena (E14) and Doresa (E18) reach a SISEorbit RMS of about 1 m (comparable to that of the other Galileo satellites reach with the nominal validity time) when validity time of 1800 s is used. Therefore, using this threshold, the two satellites could be used to improve single point positioning accuracy. View Full-Text
Keywords: Galileo; Doresa; Milena; broadcast ephemeris; precise ephemeris; sp3; SISE Signal In Space Error; broadcast ephemeris validity time Galileo; Doresa; Milena; broadcast ephemeris; precise ephemeris; sp3; SISE Signal In Space Error; broadcast ephemeris validity time
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Robustelli, U.; Benassai, G.; Pugliano, G. Signal in Space Error and Ephemeris Validity Time Evaluation of Milena and Doresa Galileo Satellites. Sensors 2019, 19, 1786.

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