Rubidium Frequency Standard for the GPS IIF program and modifications for the RAFSMOD Program

Dupuis, R.T.; Lynch, Thomas; Vaccaro, Joseph

doi:10.1109/freq.2008.4623081

Cited by 34 publications

(26 citation statements)

References 2 publications

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“…As regards a thermal sensitivity of the atomic frequency standard, timing errors of ±0.25 ns (±7.5 cm) have been predicted by Wu (1996) for the Block IIR satellites based on an expected temperature variation of ±2.5 K outside eclipses. Following Dupuis et al (2010), the rubidium clocks of the Block IIF satellites are mounted on a thermally isolated sub-panel (along with the frequency distribution unit) for which a peak-to-peak temperature variation of less than 0.5 K has been observed in SVN62 onboard measurements. In addition, the new clock benefits from a baseplate temperature controller (BTC), which further reduces the sensitivity to external temperature variations by up to a factor of 50.…”

Section: Discussionmentioning

confidence: 99%

“…They result in a pronounced degradation of the Allan variance at time intervals of 1-12 h as compared to life tests of similar clocks carried out at the Naval Research Lab prior to the flight (Vannicola et al 2010). While the SVN62 rubidium frequency standard clearly outperforms clocks of other GPS satellites at time intervals of less than an hour and beyond a day (Senior 2010;Dupuis et al 2010), a clear ''bump'' in the Allan variance shows up at intermediate intervals, which limits the clock predictability at these timescales.…”

Section: Introductionmentioning

confidence: 95%

“…The new Block IIF rubidium frequency standard (RFS-IIF) is a successor of the Perkin-Elmer rubidium clocks that are presently in use onboard the Block IIR satellites. It offers a factor-of-two reduction of the white noise level over timescales of 100 s to 1 day, which is achieved through use of a xenon buffer gas and a thinfilm filter for the Rb-D spectral lines in the improved physics package (Dupuis et al 2010). …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

et al. 2011

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The Block IIF satellites feature a new generation of high-quality rubidium clocks for time and frequency keeping and are the first GPS satellites transmitting operational navigation signals on three distinct frequencies. We investigate apparent clock offset variations for the Block IIF-1 (SVN62) spacecraft that have been identified in L1/ L2 clock solutions as well as the L1/L5-minus-L1/L2 clock difference. With peak-to-peak amplitudes of 10-40 cm, these variations are of relevance for future precision point positioning applications and ionospheric analyses. A proper characterization and understanding is required to fully benefit from the quality of the new signals and clocks. The analysis covers a period of 8 months following the routine payload activation and is based on GPS orbit and clock products generated by the CODE analysis center of the International GNSS Service (IGS) as well as triplefrequency observations collected with the CONGO network. Based on a harmonic analysis, empirical models are presented that describe the sub-daily variation of the clock offset and the inter-frequency clock difference. These contribute to a better clock predictability at timescales of several hours and enable a consistent use of L1/L2 clock products in L1/L5-based positioning.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

et al. 2011

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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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“…Such a development also takes place in space, where satellites are equipped with better and better clocks. Examples are the Hydrogen-maser (H-maser) on GIOVE-B (Galileo In-Orbit Validation Element), see Montenbruck et al (2012), and the modified rubidium clock on GPS-IIF SVN62 (Dupuis et al 2010). In recent years, investigations concerning clock modeling came to into focus again.…”

Section: Introductionmentioning

confidence: 99%

Stochastic modeling of high-stability ground clocks in GPS analysis

Wang

Rothacher

2013

J Geod

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In current global positioning system (GPS) applications, receiver clocks are typically estimated epoch-wise in the data analyses even for clocks with high performance like Hydrogen-masers (H-maser). Applying an appropriate clock model for high-stability receiver clocks should, in view of the strong correlation between the station height and the clock parameters, significantly improve the positioning results. Recent experiments have shown that modeling the deterministic behavior of high-quality receiver clocks can improve the kinematic precise point positioning considerably. In this paper, well-behaving ground clocks are studied in detail applying constraints between subsequent and near-subsequent clock parameters. The influence of different weights for these relative clock constraints on the positioning quality, especially on the height, is investigated. For excellent clocks, an improvement of up to a factor of 3 can be obtained for the repeatability of the kinematic height estimates. This may be essential to detect small but sudden changes in the vertical component (e.g., caused by earthquakes). Troposphere zenith path delays (ZPD) are also heavily correlated with the receiver clock estimates and station heights. All these parameters are usually estimated simultaneously. We show that the use of relative clock constraints allows for a higher time resolution of the ZPD estimates (smaller than 2 h) without compromising the quality of the kinematic height estimates.

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Rubidium Frequency Standard for the GPS IIF program and modifications for the RAFSMOD Program

Cited by 34 publications

References 2 publications

Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

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

Stochastic modeling of high-stability ground clocks in GPS analysis

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