Galileo System Status, Performance Metrics and Results

Galluzzo, G.; Rodrı́guez, Rafael L.; Morgan-Owen, R.; Binda, S.; Blonski, Daniel; Crosta, Paolo; Gonzalez, Francisco; Garcia, J. Molina; Otero, X.; Sirikan, N.; Spangenberg, M.; Spinelli, Enrico; Swinden, Richard; Wallner, Stefan

doi:10.33012/2018.15535

Cited by 10 publications

(4 citation statements)

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“…Using a constellation of 12 active satellites, the researchers reported a signalin-space range error (SISE) of 30 cm and Galileo-only point positioning precision of 2 cm in static mode using daily solutions. [2] reported extensively on the Galileo status, methodology and performance metrics for the 2014-2017 time period. The authors also concluded that the global average SISE has improved gradually and stabilised around a constellation value of 0.50 m (95%) in 2017.…”

Section: Introductionmentioning

confidence: 99%

Signal performance analysis of the latest quartet of Galileo satellites during the first operational year

Andrei

Johansson

Koivula

et al. 2020

2020 International Conference on Localization and GNSS (ICL-GNSS)

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On 12 February 2020, the latest four Galileo satellites had completed one full year of space operational service. The satellites were launched on 25 July 2018. The quartet increased the operational capacity of the Galileo constellation to 22 satellites. This study reports on three signal-in-space (SiS) performance indicators-status, availability, and ranging accuracy-from 11 February 2019 to 12 February 2020. In addition, the study looks also at how the on-board satellite clocks have performed. The data analysis shows 100% data validity and signal health status for three our of the four satellites, whereas NAPA (No Accuracy Prediction Available) events accounted for about 2% of the time. In addition, SiS availability was higher than 95% in the first operational year. Furthermore, the 95th percentile of the global average of the instantaneous signal in space error is found to vary between 0.17 to 0.33 m on monthly basis. Lastly, the precise satellite clock biases show high short-term performance with 0.1 ps/s (10 −13 s/s) standard deviations during the first operational year. The numerical results indicate a robust performance and high reliability for the youngest Galileo satellites in the constellation. They increase the number of operational satellites in the constellation and thus contribute to the Galileo's increased popularity in the satellite-based positioning and navigation user community.

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Section: Introductionmentioning

confidence: 99%

Signal performance analysis of the latest quartet of Galileo satellites during the first operational year

Andrei

Johansson

Koivula

et al. 2020

2020 International Conference on Localization and GNSS (ICL-GNSS)

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“…GST follows GPS in the week numbering and in the format of reporting the predicted offset between GST and a prediction of UTC. Publications from an earlier phase of the development of Galileo describe the architecture and achieved performances (Píriz et al 2015a, Galluzzo et al 2018) in some detail. In the meantime, however, contractual responsibilities and technical implementation have significantly changed.…”

Section: Using Galileo Signals As Time and Frequency Referencementioning

confidence: 99%

On the possibility of getting traceable time and frequency measurements via GNSS receivers

et al. 2020

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The realization of Coordinated Universal Time, one of the tasks of the International Bureau of Weights and Measures, relies on a network of international time links which currently is organized in a star-like scheme that links all contributing laboratories. GPS signal reception is the technique most widely employed by the laboratories. The PTB currently plays a unique role in the process due to its function as the central pivot in the time transfer between the participating laboratories. We discuss how the PTB meets its obligations to the international timekeeping community as well as to its users in Germany. In its role as an National Metrology Institute (NMI), PTB is entrusted with the realization and dissemination of legal time in Germany. The services were offered to the public support measurements and timing applications traceable to the national and international standards to be made in calibration laboratories and in many industrial sectors. We thus discuss the meaning and definition of traceability, how different GNSS systems can be used to establish traceability and their performance in doing so.

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“…It is also important to point out that the inherent maturation of the constellation entails events of nonstationary performance as depicted in Figure 4. As shown in Perea et al 5 and Galluzzo et al, 11 SISRE RMS for Galileo satellites presented values of 1 m in March 2015 having a drastic performance improvement to today's figures (SISRE 1-values around 25-30 cm). Not only has the nominal performance greatly improved but also the number of outliers has been reduced.…”

Section: Gps and Galileo Sisre Analysis: Previous Workmentioning

confidence: 79%

Impact of sample correlation on SISRE overbound for ARAIM

2020

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This paper analyzes the effect of error correlation on the SISRE bounding for GPS and Galileo satellites. For a given period of data collection, it computes the effective number of independent samples contained in a dataset applying an estimation variance analyses. Results show that the time between effective independent samples is highly dependent on the constellation and onboard clock type. On one hand, GPS satellites equipped with Rubidium clocks exhibit significantly longer error correlation than those with onboard Cesium clocks. On the other hand, Galileo satellites show substantially shorter correlation time among samples with less variability on a monthly basis. This paper also introduces a methodology to compute SISRE bounding accounting for the limited number of independent samples. Using a Bayesian approach, it computes the so‐called uncertainty factor by which the Gaussian distribution needs to be inflated in order to account for the observation data independence.

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Galileo System Status, Performance Metrics and Results

Cited by 10 publications

References 0 publications

Signal performance analysis of the latest quartet of Galileo satellites during the first operational year

Signal performance analysis of the latest quartet of Galileo satellites during the first operational year

On the possibility of getting traceable time and frequency measurements via GNSS receivers

Impact of sample correlation on SISRE overbound for ARAIM

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