Short-term characterization of GPS disciplined oscillators and field trial for frequency of Italian calibration centres

Cordara, F.; Pettiti, V.

doi:10.1109/freq.1999.840792

Cited by 6 publications

(3 citation statements)

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“…For short integration times, the Allan deviation increases with a slope of τ 0.2 , reaching a distinct maximum of 3.6 × 10 −12 at τ = 64 s. For longer integration times, the Allan deviation decreases. This behavior is consistent with former results reported in the literature [ 81 , 82 , 83 , 84 ]. The frequency output of the OCXO is steered to agree with the signals transmitted by the GPS satellites and can thus take advantage of their high long-term stability [ 13 , 84 ].…”

Section: Resultssupporting

confidence: 93%

A GPS-Referenced Wavelength Standard for High-Precision Displacement Interferometry at λ = 633 nm

Blumröder

Köchert

Fröhlich

et al. 2023

Sensors

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Since the turn of the millennium, the development and commercial availability of optical frequency combs has led to a steadily increase of worldwide installed frequency combs and a growing interest in using them for industrial-related metrology applications. Especially, GPS-referenced frequency combs often serve as a “self-calibrating” length standard for laser wavelength calibration in many national metrology institutes with uncertainties better than u = 1 × 10−11. In this contribution, the application of a He-Ne laser source permanently disciplined to a GPS-referenced frequency comb for the interferometric measurements in a nanopositioning machine with a measuring volume of 200 mm × 200 mm × 25 mm (NPMM-200) is discussed. For this purpose, the frequency stability of the GPS-referenced comb is characterized by heterodyning with a diode laser referenced to an ultrastable cavity. Based on this comparison, an uncertainty of u = 9.2 × 10−12 (τ = 8 s, k = 2) for the GPS-referenced comb has been obtained. By stabilizing a tunable He-Ne source to a single comb line, the long-term frequency stability of the comb is transferred onto our gas lasers increasing their long-term stability by three orders of magnitude. Second, short-term fluctuations-related length measurement errors were reduced to a value that falls below the nominal resolving capabilities of our interferometers (ΔL/L = 2.8 × 10−11). Both measures make the influence of frequency distortions on the interferometric length measurement within the NPMM-200 negligible. Furthermore, this approach establishes a permanent link of interferometric length measurements to an atomic clock.

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Section: Resultssupporting

confidence: 93%

A GPS-Referenced Wavelength Standard for High-Precision Displacement Interferometry at λ = 633 nm

Blumröder

Köchert

Fröhlich

et al. 2023

Sensors

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“…Fig 2 shows the result of adjacent averaging numeric filter about 800 points, the middle white line implies that the noise level has been lowered significantly. [6], the proposed GPS disciplined Rubidium has basically the same configuration as the conventional PLL: a Phase Detector, a Loop Filter and a VCO whose frequency is controlled by an external voltage. The PD compares the phase of a periodic input signal against the phase of the VCO; output of the PD is a measure of the phase difference between its two inputs.…”

Section: IImentioning

confidence: 99%

An Improved Time Synchronous System Based on GPS Disciplined Rubidium

Baojian¹,

Zhou²,

Dazhi

2010

2010 International Conference on Intelligent Computation Technology and Automation

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In this paper, an improved time synchronous system based on Global Positioning System (GPS) disciplined Rubidium frequency standard is introduced. By comparing with the Cesium frequency standard's output, the difference between the two signals has been measured, the character of the GPS timing signal is analyzed, it is proved that the GPS timing signal has a zero mean value over the long haul and the accuracy may be enhanced by making many measurements and averaging them. A scheme of GPS disciplined Rubidium based on Time to Digital Converter(TDC), numeric data filtering, embedded computer and precisely Digital to Analogy Converter is designed, the accuracy of the GPS disciplined Rubidium frequency standard is about 3×10-12 . Based on the same , a novel method of time Synchronous using GPS timing signal is invented. Not as the normal method-directly using any one of the GPS timing signal to synchronous, the improved time synchronous system's output is synchronous to the GPS timing signal's mean, though it has a lower noisy level and a good accuracy. The precisely time synchronous circuit based on an embedded computer, Complicated Programmable Logical Device(CPLD), Time to Digital Converter(TDC) is described, and the test result results are presented too.

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“…The need for calibration of the time from the normal GPS receiver has been emphasized in some reports [8][9][10]. Some studies [11][12][13][14] were also carried out on the performances of GPS-disciplined clocks. However, the increasingly extensive uses of the GPS timing system these days demand more elaborate studies on the performances of these receivers.…”

Section: Introductionmentioning

confidence: 99%

A study on the potentiality of the GPS timing receiver for real time applications

Banerjee¹,

Suman²,

Suri³

et al. 2007

Meas. Sci. Technol.

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Two categories of GPS timing receivers have been identified for real time applications. Performances of a few such receivers have been studied. The GPS time in some of the receivers has been found to have some bias error. This demands the necessity of the calibration of the GPS receiver prior to its precise application. It has been observed that the time error (or phase error) normally remains constant for a particular receiver. So this may not affect the frequency accuracy.

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Short-term characterization of GPS disciplined oscillators and field trial for frequency of Italian calibration centres

Cited by 6 publications

References 0 publications

A GPS-Referenced Wavelength Standard for High-Precision Displacement Interferometry at λ = 633 nm

A GPS-Referenced Wavelength Standard for High-Precision Displacement Interferometry at λ = 633 nm

An Improved Time Synchronous System Based on GPS Disciplined Rubidium

A study on the potentiality of the GPS timing receiver for real time applications

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