Short-term stability of GNSS on-board clocks using the polynomial method

Delporte, J.; Boulanger, C.; Mercier, F.

doi:10.1109/eftf.2012.6502347

Cited by 8 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the epoch time, c the speed of light in a vacuum, λ l the wavelength of the carrier phase, ϕ m j the carrier phase observation, δ t m and δ t j the receiver In GNSS positioning correct and precise time allows for the determination of the objects with the appropriate accuracy and quality, and also enables the use of GNSS systems in all areas of satellite positioning, e.g., train monitoring, 3D models, or time series analysis. In a similar regard regarding GNSS clock analysis, ground clock is often a stable reference [20], and in case of the external clock performance are better than the space clock [2]. The ground GNSS clock was not an object of the wide spectrum of the research.…”

Section: Aging Of Ground Global Navigation Satellite System Oscillatorsmentioning

confidence: 99%

Aging of ground Global Navigation Satellite System oscillators

Maciuk¹

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

Global Navigation Satellite System (GNSS) are widely used in many areas of human life and activity. The proper functioning of GNSS systems depends on several factors, the most important of which is the correct knowledge of time. The position indirectly is based on the knowledge of the distance, which is determined based on time with the knowledge of the speed of the electromagnetic wave. Thus, proper (accurate) knowledge of time (GNSS clock stability) is a key to precise positioning. In this text, the long-term stability of the GNSS station clocks covering the years 1994-2020 was analysed. For this purpose, the corrections of the clocks at selected permanent stations were used, and their stability was determined for all years separately. Then the change of clock stability over time and the search for correlation were analysed. As the results showed, there are clearly differences between four of the type of oscillators analysed. In case of the comparison on an annual basis, no change over time was found.

show abstract

Section: Aging Of Ground Global Navigation Satellite System Oscillatorsmentioning

confidence: 99%

Aging of ground Global Navigation Satellite System oscillators

Maciuk¹

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

View full text Add to dashboard Cite

show abstract

“…Therefore, monitoring of the satellite on-board clocks is very important; in other words the accuracy of the GNSS system depends on the nature of the satellite clocks [32,33]. The stability of the on-board clocks is essential in the GNSS positioning, and the estimation of these clocks requires a large number of tracking ground stations [34]. GNSS on-board clocks have been widely studied to date [35][36][37][38][39], including their influence on the PPP technique [40].…”

Section: Gnss (Global Navigationmentioning

confidence: 99%

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

Maciuk

Lewińska

2019

Remote Sensing

View full text Add to dashboard Cite

Knowledge of the global navigation satellite system (GNSS) satellite clock error is crucial in real-time precise point positioning (PPP), seismology, and many other high-rate GNSS applications. In this work, the authors show the characterisation of the atomic GNSS clock’s stability and its dependency on the adopted orbit type using Allan deviation with two methods of averaging time. Four International GNSS Service (IGS) orbit types were used: broadcast, ultra-rapid, rapid and final orbit. The calculations were made using high-rate 1 Hz observations from the IGS stations equipped with external clocks (oscillators). The most stable receiver oscillator was chosen as a reference clock. The results show the advantage of the newest GPS satellite block with respect to the other satellites. Significant differences in the results based on the orbit type used have not been recorded. Many averaging time methods used in Allan deviation (ADEV) show the clock’s fluctuations, usually smoothed in 2n s averaging times.

show abstract

“…Montenbruck and Steigenberger compared the performance of the Galileo clock and the Global Positioning System (GPS) Block IIF satellite [12]. Delporte evaluated the characteristics of the short-term clock offset by the polynomial method [13]. However, these studies neglected to take into consideration the variation in performance before and after changing the clock.…”

Section: Introductionmentioning

confidence: 99%

Time and frequency characterization of GLONASS and Galileo on-board clocks

Yuan

et al. 2020

Meas. Sci. Technol.

View full text Add to dashboard Cite

As the core component of navigational satellites, the on-board atomic clock is of key importance for guaranteeing the stable operation of global satellite navigation systems (GNSSs). As GNSSs are modernized, the clocks of several satellites have been changed to support long-term in-orbit operation. Analysis of the performance of on-board clocks is therefore crucial for supporting the positioning, navigation and timing of the satellite navigation system. Most studies involving stability analysis have not paid much attention to performance variation as a consequence of clocks being changed. This motivated our study, in which we analyzed the time domain characterization of on-board clocks from January 2016 to October 2018 to detect the variation. With respect to frequency domain characterization, conventional methods for noise analysis are easily affected by frequent fluctuations and local discontinuities as the averaging time increases. Hence, we propose the lag 1 autocorrelation function method based on overlapping samples to identify the noise of satellite clocks. We find that the time domain stability of the Galileo clock is of the magnitude of 10–13, 10–14 and 10–15 at averaging times of 100 s, 1000 s and 1 d, respectively, which is one order of magnitude better than that of the Russian global navigation satellite system (GLONASS). Moreover, the stability of the passive hydrogen masers on board Galileo shows a certain improvement due to the frequency modulation. The overall performance of the GLONASS cesium atomic clock and the Galileo rubidium atomic frequency standard is stable without any obvious aging in recent years. In terms of the frequency domain characterization, GLONASS clocks are mainly affected by flicker phase modulation noise, white frequency modulation noise and flicker frequency modulation noise, whereas the Galileo clocks are mainly affected by three kinds of frequency modulation noise.

show abstract

Short-term stability of GNSS on-board clocks using the polynomial method

Cited by 8 publications

References 7 publications

Aging of ground Global Navigation Satellite System oscillators

Aging of ground Global Navigation Satellite System oscillators

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

Time and frequency characterization of GLONASS and Galileo on-board clocks

Contact Info

Product

Resources

About