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实用型氢激射器频标锁相接收系统 被引量:2

The Practica1 Phase--1ocked Receiver System Using the Hydrogen Maser in VLBI
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摘要 为了使上海天文台两台氢激射器频率标准更好地适应甚长基线干涉(VLBI)实验的要求,我们充分利用国内外新器件,采用新技术方案,研制出一种实用型氢激射器锁相接收系统。该系统具有接收灵敏度高(≤-120dBm)、噪音系数烛(≤1.8dB)、体积小、自动搜索人锁以及可靠性高等特点。本文主要以系统设计为实例,讨论了氢激射器频标锁相接收系统的总体设计原则、锁相环路的设计考虑和环路对系统的噪声抑制的定量估算等问题。最后,介绍了运用该系统后氢激射器频标的短期频率稳定度达到1.88×10-^(13)/S、3.7×^(-14)/10S、9.2/10^(-15)/100S9.5×10^(-15)/1000s,完全满足了甚长基线干涉实验的需要。 The hydrogen maser frequency standard is one of practi- cal type frequency standards which are of the best frequency stabili- ty, so it is widely applied in many fields of modern science, especially in VLBI radio astronomy. Since the frequency stability of the hydrogen maser is transmitted to VCXO by means of phase-locked receiver system, while VCXO is directly used by user, the phase-locked receiver system decides the best transmission of frequency stability of the hydrogen maser frequency standard. This paper first describes the desi gn of the new high stable phase-locked receiver system, then gives the result of frequency stability of two hydrogen maser frequency standards which are provided with the new phase-locked receiver system at VLBI Seshan Sec- tion of Shang hai Observation.
机构地区 上海天文台
出处 《宇航计测技术》 CSCD 北大核心 1990年第3期62-68,共7页 Journal of Astronautic Metrology and Measurement
关键词 氢激射器 锁相 接收机 频率测量 Phase--locked receiver Frequency measurement Frequency stability Frequency property
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