Space Passive Hydrogen Maser - Performances and lifetime data-

Droz, F.; Mosset, P.; Wang, Qinghua; Rochat, P.; Belloni, M.; Gioia, Marina; Resti, A.; Waller, P.

doi:10.1109/freq.2009.5168208

Cited by 17 publications

(14 citation statements)

References 2 publications

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“…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 [6]. However, the same does not apply for the GIOVE-B PHM, which operates in a very stable thermal environment [6] and exhibits a temperature sensitivity of less than <3•10 -14 / C [7]. Also, it may be noted that the thermally induced clock (or line bias) variations on SVN62 exhibit both 1/rev and 2/rev contributions of similar amplitude, whereas the apparent GIOVE-B clock variations are clearly dominated by a 1/rev periodicity.…”

Section: Giove-b Passive Hydrogen Masersupporting

confidence: 57%

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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: Giove-b Passive Hydrogen Masersupporting

confidence: 57%

“…The superior quality of both clock types is illustrated in Figure . It shows the measured Allan deviations (ADEV) from ground performance tests in comparison with the respective specifications based on data published in and . For the RFS‐IIF clock, the targeted performance (objective) is shown in addition to the formal specification.…”

Section: Introductionmentioning

confidence: 99%

Flight Characterization of New Generation GNSS Satellite Clocks

et al. 2012

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“…This presents the possibility of applying our theory to the detection of such particles, or to set a limit to their mass, by analyzing the coherence in highly stable atomic systems, like the hydrogen maser [29,30]. The interaction of exotic matter has already been modeled as a s-wave scattering, with the proposed method of detection very similar to ours [26].…”

Section: Massive Particle Scatteringmentioning

confidence: 95%

Decoherence in Excited Atoms by Low-Energy Scattering

Quiñones¹,

Varcoe²

2016

Atoms

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Abstract:We describe a new mechanism of decoherence in excited atoms as a result of thermal particles scattering by the atomic nucleus. It is based on the idea that a single scattering will produce a sudden displacement of the nucleus, which will be perceived by the electron in the atom as an instant shift in the electrostatic potential. This will leave the atom's wave-function partially projected into lower-energy states, which will lead to decoherence of the atomic state. The decoherence is calculated to increase with the excitation of the atom, making observation of the effect easier in Rydberg atoms. We estimate the order of the decoherence for photons and massive particles scattering, analyzing several commonly presented scenarios. Our scheme can be applied to the detection of weakly-interacting particles, like those which may be the constituents of Dark Matter, the interaction of which was calculated to have a more prominent effect that the background radiation.

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“…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]. A further PHM technological program is on-going for the mass reduction of this instrument down to 12 kg without reduction of performance.…”

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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Space Passive Hydrogen Maser - Performances and lifetime data-

Cited by 17 publications

References 2 publications

Flight Characterization of New Generation GNSS Satellite Clocks

Flight Characterization of New Generation GNSS Satellite Clocks

Decoherence in Excited Atoms by Low-Energy Scattering

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

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