基于GPS/北斗共视技术的铷钟驯服方法

Approach to GPS/BDS Disciplined Rubidium Clock Based on Common View Technology

摘要:

为了提升铷钟的频率准确度等性能,以提供高精度的原子频率标准,在分析了现有铷钟驯服方法的基础上,提出了一种基于GPS/北斗共视技术的铷钟驯服方法,将铷钟的输出频率驯服到时间频率的最高国家基准UTC(NIM)上,克服了原来将铷钟频率直接驯服到星载原子钟方法中存在的频率准确度不高的缺点;另外,为了拓展北斗卫星导航系统的应用范围和维护我国在时间频率计量领域的独立自主地位,系统设计中除实现了GPS共视驯服外,还设计兼容了北斗共视驯服模式;试验结果表明,利用基于共视技术的驯服方法可以有效实现对铷钟的驯服,原来相对频率偏差指标为5e-11的铷钟经过GPS和北斗共视驯服后,其相对频率偏差指标分别提升至1.62133e-14和1.36395e-14,提升了3个数量级,达到了铯钟的水平。

Abstract:

To improve the accuracy of the rubidium clock frequency to provide the atom frequency standard with high accuracy, after analyzing the existing approaches to disciplined rubidium clock, an approach based on GPS/BDS common view technology is put forward in which the output frequency of rubidium clock is disciplined to UTC(NIM) and the existing problem of low accuracy of the old method in which the rubidium frequency is directly disciplined to the satellite carried atom clock is overcome. In addition, to expend the applied range of the BDS and maintain our independent position in time frequency metrology, BDS and GPS patterns are compatible in the system design. The experiments show that the approach based on the common view technology can realize the disciplined rubidium clock effectively, and the rubidium clock frequency accuracy, 5e-11, is improved to 1.62133e-14 and 1.36395e-14 by three orders of magnitude with GPS and BDS patterns respectively and the caesium clock level is reached.