A SAPPHIRE OSCILLATOR FOR VLBI RADIO ASTRONOMY

被引：12

作者：

COSTA, ME ^{[1
]}

BLAIR, DG ^{[1
]}

BUCKINGHAM, MJ ^{[1
]}

GILES, AJ ^{[1
]}

JONES, SK ^{[1
]}

LUITEN, AN ^{[1
]}

TURNER, PJ ^{[1
]}

YOUNG, AC ^{[1
]}

HONG, P ^{[1
]}

MANN, AG ^{[1
]}

机构：

[1] AUSTRALIA TELESCOPE NATL FACIL, EPPING 2121, AUSTRALIA

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 1992年 / 3卷 / 08期

关键词：

Crystal oscillators;

D O I：

10.1088/0957-0233/3/8/006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have designed and constructed a sapphire oscillator with a long hold-time cryostat and helium recovery system to overcome the inherent difficulty of using this liquid-helium-cooled frequency standard at a remote site. The new oscillator has been used as a frequency reference for very long baseline interferometry (VLBI) radio astronomy observations. Data are presented which show that the performance of the oscillator is superior to a rubidium standard in this application. While laboratory data have demonstrated a fractional frequency stability of about 9 x 10(-15) for integration times between 1 and 300 s the VLBI frequency stability measurements in this case are limited by the signal-to-noise ratio in the correlated data.

引用

页码：718 / 722

页数：5

共 6 条

[1]

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[2]

JONES SK, 1988, THESIS U W AUSTR

[3]

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[5] COHERENCE LIMITS FOR VERY-LONG-BASELINE INTERFEROMETRY [J].

ROGERS, AEE ;

MORAN, JM .

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[6]

STEIN SR, 1978, FUTURE TRENDS SUPERC, P192

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