Rb frequency standard with expanded operating temperature range (-55°C to +95°)

McClelland, T.; Ho, Jia Chong; Pascaru, I.; Stone, C.

doi:10.1109/freq.1999.840727

Cited by 2 publications

(3 citation statements)

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“…This data is for an un-disciplined unit, and thus represents a measure of the capability of the free running Rb system. The fact that the Allan deviation exhibits 1/√τ behavior out to 10,000 seconds is an improvement over what has generally been achieved in the past with this class of Rb oscillator [1], [2], [3]. .…”

Section: A Short Term Frequency Stabilitymentioning

confidence: 79%

“…From -25°C to +75°C the frequency variation is <3 x 10 -11 , performance which is an order of magnitude better than what has typically been achieved in the past [1], [2], [3]. Test performed with no disciplining input C. Holdover Disciplined Rb oscillators are often used as primary frequency and time references in communication networks.…”

Section: B Frequency Vs Temperaturementioning

confidence: 94%

“…The device is also capable of being disciplined by an external one pulse per second (1 PPS) signal, such as is typically available from a GPS receiver. This Rb oscillator utilizes a conventional, lamp excited vapor cell physics package, but with some key updates to the electronics, which make possible significant improvements to the performance generally obtained from this class of oscillator [1], [2], [3].…”

Section: Introductionmentioning

confidence: 99%

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Disciplined rubidium oscillator for harsh environments

McClelland

Shtaerman

Zarjetski

et al. 2011

2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS) Proceedings

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A disciplined rubidium (Rb) oscillator has been developed for use in harsh environments. This oscillator operates from -40°C to +82°C, in the presence of random vibration of up to 19 g RMS; while continuously maintaining lock of both the Rb control loop and the disciplining loop. Performance under vibration is enhanced by incorporation of a quartz oscillator with active MEMS accelerometer based vibration compensation. The device warms up in less than 15 minutes, and can be disciplined to a 1 pps input, such as the signal from a GPS receiver. One of the unique features of this device is the capability to align the internally generated RF and 1 pps signals to the input 1 pps signal with a resolution of < 1 nsec. This is accomplished using a novel PLL approach for locking the internal RF signals to the disciplining 1 pps input. A number of design refinements to the Rb physics package have also been implemented which significantly improve the performance during "holdover" conditions when no disciplining signal is present. A major design goal of this device is to reduce the accumulated time error during a 24 hour holdover period to < 245 nanoseconds.The design of this device is described, and performance data is presented to demonstrate actual performance of initial production units compared to the design objectives.

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Section: A Short Term Frequency Stabilitymentioning

confidence: 79%