Direct Measurement of Cryogenic Sapphire Oscillators with Tracking DDSs and 2-Sample Covariance

被引：0

作者：

Calosso, Claudio E. ^{[1
]}

Vernotte, Francois ^{[2
]}

Giordano, Vincent ^{[3
]}

Fluhr, Christophe ^{[4
]}

Dubois, Benoit ^{[4
]}

Rubiola, Enrico ^{[3
]}

机构：

[1] Ist Nazl Ric Metrol INRIM, Div Phys Metrol, Turin, Italy

[2] Observ Besancon, Besancon, France

[3] FEMTO ST Inst, Dept Time & Frequency, Besancon, France

[4] FEMTO Engn, Besancon, France

来源：

2018 EUROPEAN FREQUENCY AND TIME FORUM (EFTF) | 2018年

关键词：

ultra stable oscillators; phasemeter; 2-sample covariance; 3-cornered hat;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Cryogenic Sapphire Oscillators have very good frequency stability and their measurement is possible only by comparing three similar units. The task is challenging because the short-term instability is significantly lower than the background noise of commercial phasemeters and counters. In this work, we demonstrate the direct ADEV measurement of each CSO at 100 MHz. We use a 6-channel phasemeter based on tracking DDS and then we take advantage of the two-sample covariance that reduces the contribution of the instrument noise for large averaging size. The result is in the low 10(-15) at 1 s.

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页码：41 / 44

页数：4

共 13 条

[1] Direct Stability Measurement of Cryogenic Sapphire Oscillators with Tracking DDSs and Two-Sample Covariance
Calosso, Claudio E.
Fluhr, Christophe
Dubois, Benoit
Vernotte, F.
Giordano, V.
Rubiola, E.
2018 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM (IFCS), 2018, : 53 - 54
[2] Frequency Stability Measurement of Cryogenic Sapphire Oscillators With a Multichannel Tracking DDS and the Two-Sample Covariance
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Vernotte, Francois
Giordano, Vincent
Fluhr, Christophe
Dubois, Benoit
Rubiola, Enrico
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 2019, 66 (03) : 616 - 623
[3] 2-SAMPLE T2 PROCEDURE AND THE ASSUMPTION OF HOMOGENEOUS COVARIANCE MATRICES
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[10] Direct covariance measurement of CO2 gas transfer velocity during the 2008 Southern Ocean Gas Exchange Experiment: Wind speed dependency
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JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2011, 116

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