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The Allan Variance-Challenges and Opportunities.

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Title: The Allan Variance-Challenges and Opportunities.
Authors: Stein, Samuel R.1
Source: IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control. Mar2010, Vol. 57 Issue 3, p540-547. 8p.
Subjects: Audio-frequency oscillators, Heterodyne reception, Single-sideband radio, Noise measurement, Frequency stability, Bandwidths
Abstract: The Allan variance has historically been estimated using heterodyne measurement systems, which have low noise and preserve the carrier phase information needed for long-term stability. The single-sideband phase noise has traditionally been estimated using phase detectors that suppress the carrier to achieve even lower noise. The recent development of the direct-digital phase noise measurement technique makes it possible to estimate both statistics accurately and simultaneously from the same time series of the phase. Our comparison of the 3 techniques has revealed several challenges to the accurate estimation of the Allan variance including undesired aliasing, biased estimators, and spurious signal generation. Investigation of these difficulties has led to several opportunities to improve Allan variance estimation, including the ability to estimate the instrumentation noise floor during a measurement and the existence of an optimum measurement bandwidth. In the end, this has led to faster, easier, more reliable, and more accurate measurement methods. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 48606964
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The Allan Variance-Challenges and Opportunities.
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  Data: <searchLink fieldCode="DE" term="%22Audio-frequency+oscillators%22">Audio-frequency oscillators</searchLink><br /><searchLink fieldCode="DE" term="%22Heterodyne+reception%22">Heterodyne reception</searchLink><br /><searchLink fieldCode="DE" term="%22Single-sideband+radio%22">Single-sideband radio</searchLink><br /><searchLink fieldCode="DE" term="%22Noise+measurement%22">Noise measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Frequency+stability%22">Frequency stability</searchLink><br /><searchLink fieldCode="DE" term="%22Bandwidths%22">Bandwidths</searchLink>
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  Data: The Allan variance has historically been estimated using heterodyne measurement systems, which have low noise and preserve the carrier phase information needed for long-term stability. The single-sideband phase noise has traditionally been estimated using phase detectors that suppress the carrier to achieve even lower noise. The recent development of the direct-digital phase noise measurement technique makes it possible to estimate both statistics accurately and simultaneously from the same time series of the phase. Our comparison of the 3 techniques has revealed several challenges to the accurate estimation of the Allan variance including undesired aliasing, biased estimators, and spurious signal generation. Investigation of these difficulties has led to several opportunities to improve Allan variance estimation, including the ability to estimate the instrumentation noise floor during a measurement and the existence of an optimum measurement bandwidth. In the end, this has led to faster, easier, more reliable, and more accurate measurement methods. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/TUFFC.2010.1445
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      – Code: eng
        Text: English
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        PageCount: 8
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      – SubjectFull: Audio-frequency oscillators
        Type: general
      – SubjectFull: Heterodyne reception
        Type: general
      – SubjectFull: Single-sideband radio
        Type: general
      – SubjectFull: Noise measurement
        Type: general
      – SubjectFull: Frequency stability
        Type: general
      – SubjectFull: Bandwidths
        Type: general
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      – TitleFull: The Allan Variance-Challenges and Opportunities.
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              Text: Mar2010
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