论文部分内容阅读
一、前言关于频率稳定度的概念、定义和测量,在六十年代以前是很混乱的。其后,随着高稳定振荡器在精密仪器、雷达和空间技术等方面的应用和计时系统的要求,才重视稳定度的问题。如以时间或以频率为基准的系统,其精度基本上由参考振荡器或时间发生器的稳定度决定。又如直接频率合成器对幅度变化并不敏感,而对调相边带特别敏感。美国IEEE于1970年集中了关于频稳定义的意见,大致给出了美国的结论,我国在1976年2月和1977年12月分别通过了各类频标的频率稳定度的表征,明确规定采用阿仑方差作为频稳的时域表征量,对原子频标还建议采用相对频率起伏谱密度作为频稳的频域表征量。
I. INTRODUCTION The concepts, definitions, and measurements of frequency stability were confusing until the 1960s. Since then, with the high stability oscillator in precision instruments, radar and space technology applications and timing system requirements, only the stability of the problem. Such as time or frequency-based systems, the accuracy of which is basically determined by the stability of the reference oscillator or time generator. Another example is the direct frequency synthesizer is not sensitive to changes in amplitude, and phase sensitive sidebands are particularly sensitive. In 1970, the United States Centralized the Opinions on the definition of frequency stability and gave roughly the conclusion of the United States. In February 1976 and December 1977 respectively, China passed the characterization of the frequency stability of various types of frequency standards, Lun frequency variance as a stable time-domain characterization of the atomic frequency standard also recommends the use of relative frequency fluctuation spectral density as a frequency-stable frequency domain representation.