Recently result on passive hydrogen maser of SHAO by single frequency modulation

This paper introduces recently result on passive hydrogen maser of Shanghai Astronomical Observatory by single frequency modulation. Digital servo system and analog servo system have been experimented. DDS is used to generate frequency modulation in the RF interrogation chain in both systems. The al...

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Bibliographic Details
Published in2012 European Frequency and Time Forum pp. 69 - 71
Main Authors Liu, Tiexin, Xu, Wen, Chen, W.X, Dai, J.Y, Zhang, Y, Xie, Y.H, Lin, C.F
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2012
Subjects
Frequency modulation
Hydrogen
Masers
Resonant frequency
Servomotors
Temperature measurement
Time-frequency analysis
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Summary:This paper introduces recently result on passive hydrogen maser of Shanghai Astronomical Observatory by single frequency modulation. Digital servo system and analog servo system have been experimented. DDS is used to generate frequency modulation in the RF interrogation chain in both systems. The algorithm separating two errors is used in digital system. The traditional integrator and digital phase shift are used in analog system. An Allan standard deviation of two systems has been tested based on same physical part. Both of them have achieved at σ y (τ) <; 1×10 -12 τ -1/2 (1s≤τ≤10000s) and σ y (day) <;2×10 -14 .
ISBN:1467319244
9781467319249
DOI:10.1109/EFTF.2012.6502335