Main features of space rubidium atomic frequency standard for BeiDou satellites

Mei, Ganghua; Zhong, Da; An, Sensong; Zhang, Feng; Feng, Qi; Wang, Fang; Ming, Gang; Li, Wenbin; Wang, Pengfei

doi:10.1109/eftf.2016.7477803

Cited by 19 publications

(11 citation statements)

References 5 publications

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“…The cell is 25 mm long and has a 25-mm diameter; the thickness of the glass walls is t cell = 1 mm. The barometric shift is defined as the variation of the clock frequency due to a change of the external pressure: y/P out and it can be expanded using the internal buffer-gas pressure change P in y/P out = y/P in × P in /P out (1) where y is the fractional clock frequency, P in is the buffer-gas pressure inside the cell, and P out is the cell's environmental pressure (in the present case the atmospheric pressure). In (1), the first term of the right-hand side is the buffer-gas pressureshift y/P in [17], which is 1.9 × 10 −8 /hPa for our clock.…”

Section: Barometric Effectmentioning

confidence: 99%

“…In (1), the first term of the right-hand side is the buffer-gas pressureshift y/P in [17], which is 1.9 × 10 −8 /hPa for our clock. 1 The second term describes how the internal pressure varies as function of the external pressure. Considering the perfect gas law, the relative variation of the internal pressure equals the relative variation of the internal cell's volume V , i.e.,…”

Section: Barometric Effectmentioning

confidence: 99%

“…Huang et al [13] applied Hook's law on the entire vapor cell. Using the volume deformation reported in [13] for a cell with comparable volume and applying (1) and 3, the resulting barometric coefficient for our cell would be 5.4 × 10 −13 /hPa. This value is 6 times larger than the value obtained in (7) and larger than measured environmental pressure-shift coefficients reported in [8]- [10].…”

Section: Barometric Effectmentioning

confidence: 99%

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Barometric Effect in Vapor-Cell Atomic Clocks

Moreno

Pellaton

Affolderbach

et al. 2018

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

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Vapor-cell atomic clocks are compact and high-performance frequency references employed in various applications ranging from telecommunication to global positioning systems. Environmental sensitivities are often the main sources of long-term instabilities of the clock frequency. Among these sensitivities, the environmental pressure shift describes the clock frequency change with respect to the environmental pressure variations. We report here on our theoretical and experimental analysis of the environmental pressure shift on rubidium atomic frequency standards (RAFSs) operated under open atmosphere. By using an unsealed high-performance laser-pumped rubidium standard, we demonstrate that the deformation of the vapor-cell volume induced by the environmental pressure changes (i.e., barometric effect) is the dominant environmental pressure shift in a standard laboratory environment. An experimental barometric coefficient of /hPa is derived, in good agreement with theory and with previously reported measurements of frequency shifts of RAFS operated when transiting to vacuum.

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Section: Barometric Effectmentioning

confidence: 99%

Section: Barometric Effectmentioning

confidence: 99%

Section: Barometric Effectmentioning

confidence: 99%

See 1 more Smart Citation

Barometric Effect in Vapor-Cell Atomic Clocks

Moreno

Pellaton

Affolderbach

et al. 2018

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

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show abstract

“…State-of-the-art frequency instability demonstrated with compact atomic clocks. Data for other laboratory clocks are extracted from: (a) [44], (b) [28], (c) [52], (d ) [53]. Data for industrial clocks are extracted from: (e) [34], ( f ) [35], (g ) [36], (h) [149], (i ) [150], ( j ) [37], (k) [38], (l ) [39], ( [33].…”

Section: C4 Perspectivesmentioning

confidence: 99%

“…These clocks combining compact size and low power consumption with good stability performance play a crucial role in Global Navigation Satellite Systems (GNSS) [23], synchronization in telecommunications [24] and power grids [25]. GNSS applications in particular require not only a good short-term stability (few 10 −13 at 1 s) but also an excellent long-term stability at the level of 10 −14 (≈ 1 ns) over one day [26] and widely exploit the Rb vapor-cell clocks as on-board secondary frequency standards [22,27,28].…”

Section: Introductionmentioning

confidence: 99%