Update on the In-Orbit performances of GIOVE clocks

Waller, P.; Gonzalez, Francisco; Binda, S.; Sesia, I.; Tavella, P.; Hidalgo, I.; Tobías, Guillermo

doi:10.1109/freq.2009.5168207

Cited by 20 publications

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“…The obvious correlation of clock errors with the orbital period resembles the situation discussed earlier for the GPS SVN62 satellite and likewise suggests temperature sensitivity as a cause of the clock variations. A similar effect has indeed been verified for the Rubidium clock of GIOVE‐A, which is known to operate outside the nominal temperature range and to experience larger than planned temperature variations . However, the same does not apply for the GIOVE‐B PHM, which operates in a very stable thermal environment and exhibits a temperature sensitivity of less than <3∙10 ‐14 /°C .…”

Section: Resultssupporting

confidence: 56%

Flight Characterization of New Generation GNSS Satellite Clocks

et al. 2012

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The passive hydrogen maser of GIOVE‐B and the new GPS Block IIF Rubidium clock have demonstrated a superior stability in ground tests. In practice, however, the apparent clock performance for GNSS users is limited by measurement errors and imperfections of the signal chain that affect the clock variance at different time scales. Within this paper, we provide a direct comparison of the apparent clock performance for GIOVE‐B and the first Block IIF satellite (SVN62). Periodic errors in the apparent clocks of both satellites are analyzed and an effort is made to separate the impact of orbit determination errors from physical clock or line bias variations. For SVN62 an empirical clock correction model is discussed, which offers a notable reduction of the Allan variance at orbital time scales. Furthermore, triple‐frequency observations are used to demonstrate the presence of thermally induced line bias variations and to quantify the resulting inter‐frequency clock biases. Copyright © 2012 Institute of Navigation.

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Section: Resultssupporting

confidence: 56%

Flight Characterization of New Generation GNSS Satellite Clocks

et al. 2012

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“…These values are examples of the stability reached by a space-based rubidium frequency standard following the first Galileo space clock specifications [23]. The frequency drift is given as a constant linear drift represented by…”

Section: Numerical Simulationsmentioning

confidence: 99%

Detection of weak frequency jumps for GNSS onboard clocks

Huang

Gong

2014

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, a weak frequency jump detection method is developed for onboard clocks in global navigation satellite systems (GNSS). A Kalman filter is employed to facilitate the onboard real-time processing of atomic clock measurements, whose N-step prediction residuals are used to construct the weak frequency jump detector. Numerical simulations show that the method can successfully detect weak frequency jumps. The detection method proposed in this paper is helpful for autonomous integrity monitoring of GNSS satellite clocks, and can also be applied to other frequency anomalies with an appropriately modified detector.

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“…The PHM was designed to improve the Galileo system autonomy by a factor 10 and to provide greatly improved accuracy. This Passive Hydrogen Maser Clock's stability was estimated and presented at EFTF 2009 [24]. No specific changes are foreseen for the next IOV Passive Hydrogen Masers since long term test data have not shown any limitation of lifetime or degradation of performance [25].…”

Section: Galileomentioning

confidence: 99%

Space qualified frequency sources (clocks) for current and future GNSS applications

Mallette

White

Rochat³

2010

IEEE/ION Position, Location and Navigation Symposium

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Accurate and stable frequency reference sources are critical for commercial, navigation, military and scientific space applications. Several levels of frequency references are suitable for space applications. This paper discusses similarities and differences among single distributed oscillators for communications satellites, master oscillator groups for communications systems, and atomic clocks for military and navigation systems. This paper builds on reference [1] and broadly describes frequency sources on current and upcoming global navigation satellite systems (

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Update on the In-Orbit performances of GIOVE clocks

Cited by 20 publications

References 0 publications

Flight Characterization of New Generation GNSS Satellite Clocks

Flight Characterization of New Generation GNSS Satellite Clocks

Detection of weak frequency jumps for GNSS onboard clocks

Space qualified frequency sources (clocks) for current and future GNSS applications

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