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引言频率稳定度是一个重要问题,特别是近十几年来,雷达、空间技术等尖端技术科学的发展,广泛利用多普勒原理来对空间飞行器(卫星、飞船、导弹等)进行精密测速。多普勒测速的关键问题之一是要有一个频率短期稳定度很高,频谱很纯的振荡信号源。本文从多普勒测速对频率短期稳定度的要求出发,分析多普勒测速对参考频率源短期稳定度的要求,探讨用什么定义和术语来描述频标源的频率短期稳定度比较合理。因为在这方面存在着混乱现象。如有的工程用户提出用“相关方差”来描述,有的用“平均频率短期稳定度”来描述,也有的仍然用“标准方差”来描述等等。合理统一工程用户和计量测试部门的术语,对这一问题做进一步的分析是有必
INTRODUCTION Frequency stability is an important issue. Especially in recent decade, radar, space technology and other cutting-edge technologies have been developed. The Doppler principle is widely used to make precise measurements of spacecraft (satellites, spacecraft and missiles). One of the key issues with Doppler velocimetry is to have an oscillatory signal source with a very short frequency of short-term stability and a very pure frequency spectrum. Based on the requirement of Doppler velocimetry for short-term frequency stability, this paper analyzes the requirements of Doppler velocimetry for short-term stability of reference frequency source, and discusses what definition and terminology are used to describe the frequency short-term stability of frequency source. Because of the chaos in this area. Some engineering users propose “relevant variance” to describe, some use “average frequency short-term stability” to describe, and some still use “standard deviation” to describe and so on. It is necessary to further unify the terms of engineering users and metrology testing departments to make further analysis on this issue