The In-Orbit performances of GIOVE clocks

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

doi:10.1109/tuffc.2010.1472

Cited by 52 publications

(41 citation statements)

References 2 publications

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“…Numerous industrial applications including satellite-based navigation, telecommunication and space applications require field-deployable atomic clocks combining excellent fractional frequency stability, low power consumption and small size [1][2][3][4]. In this domain, lamp-based microwave Rb vapor cell atomic clocks based on optical-microwave double resonance technique, have been widely used for decades.…”

Section: Introductionmentioning

confidence: 99%

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Hafiz

Coget

Yun

et al. 2017

Journal of Applied Physics

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We demonstrate a high-performance coherent-population-trapping (CPT) Cs vapor cell atomic clock using the push-pull optical pumping technique (PPOP) in the pulsed regime, allowing the detection of high-contrast and narrow Ramsey-CPT fringes. The impact of several experimental parameters onto the clock resonance and short-term fractional frequency stability, including the laser power, the cell temperature and the Ramsey sequence parameters, has been investigated. We observe and explain the existence of a slight dependence on laser power of the central Ramsey-CPT fringe line-width in the pulsed regime. We report also that the central fringe line-width is commonly narrower than the expected Ramsey linewidth given by 1/(2T R ), with T R the free-evolution time, for short values of T R . The clock demonstrates a short-term fractional frequency stability at the level of 2.3 × 10 −13 τ

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Section: Introductionmentioning

confidence: 99%

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Hafiz

Coget

Yun

et al. 2017

Journal of Applied Physics

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“…The most famous example is the global navigation satellite systems (GNSS), where a 1 μs error of the on-board clock could induce a 300 m error on the localization on earth. The current stability performances of vapour cell atomic clocks used in the Galileo program are 5x10 -12 at 1 s [1]. Laboratories are now preparing the next generations with the challenge to reach at least 5x10 -13 at 1 s as fractional frequency stability.…”

Section: Introductionmentioning

confidence: 99%

Compact atomic clock prototype based on coherent population trapping

Danet

Kozlova

Yun

et al. 2014

EPJ Web of Conferences

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Abstract. Toward the next generations of compact atomic clocks, clocks based on coherent population trapping (CPT) offer a very interesting alternative. Thanks to CPT, a quantum interfering process, this technology has made a decisive step in the miniaturization direction. Fractional frequency stability of 1.5x10 -10 at 1 s has been demonstrated in commercial devices of a few cm 3 . The laboratory prototype presented here intends to explore what could be the ultimate stability of a CPT based device. To do so, an original double-Λ optical scheme and a pulsed interrogation have been implemented in order to get a good compromise between contrast and linewidth. A study of two main sources of noise, the relative intensity and the local oscillator (LO) noise, has been performed. By designing simple solutions, it led to a new fractional frequency limitation lower than 4x10 -13 at 1 s integration. Such a performance proves that such a technology could rival with classical ones as double resonance clocks.

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“…τ −1/2 using this compact microwave cavity demonstrates better stability than that of atomic clocks presently used in satellite navigation systems, 17 such as the PHM (6.5 × 10…”

Section: Discussionmentioning

confidence: 99%

“…17 Recently, the stability of atomic vapor cell standards has been improved by the use of lasers for state preparation. 1,[18][19][20] The short-term frequency stability of a clock (in terms of Allan deviation) is inversely proportional to the atomic quality factor and to the signal-to-noise (S/N) ratio.…”

Section: Introductionmentioning

confidence: 99%

Compact microwave cavity for high performance rubidium frequency standards

Stefanucci

Bandi

Merli

et al. 2012

Review of Scientific Instruments

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Analysis of the mode composition of an X-band overmoded O-type Cerenkov high-power microwave oscillator Phys. Plasmas 19, 103102 (2012) Gap independent coupling into parallel plate terahertz waveguides using cylindrical horn antennas J. Appl. Phys. 112, 073102 (2012) A band-pass filter approach within molecular dynamics for the prediction of intrinsic quality factors of nanoresonators J. Appl. Phys. 112, 074301 (2012) A research of W-band folded waveguide traveling wave tube with elliptical sheet electron beam Phys. Plasmas 19, 093117 (2012) Additional information on Rev. Sci. Instrum. The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE 011 -like mode are presented. The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor. Its design analysis demonstrates the limitation of the loop-gap resonator lumped model when targeting such a large cell, thus numerical optimization was done to obtain the required performances. Microwave characterization of the realized prototype confirmed the expected working behavior. Double-resonance and Zeeman spectroscopy performed with this cavity indicated an excellent microwave magnetic field homogeneity: the performance validation of the cavity was done by achieving an excellent short-term clock stability as low as 2.4 × 10 −13 τ −1/2 . The achieved experimental results and the compact design make this resonator suitable for applications in portable atomic high-performance frequency standards for both terrestrial and space applications.

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The In-Orbit performances of GIOVE clocks

Cited by 52 publications

References 2 publications

A high-performance Raman-Ramsey Cs vapor cell atomic clock

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Compact atomic clock prototype based on coherent population trapping

Compact microwave cavity for high performance rubidium frequency standards

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