摘要
在卫星导航系统中,原子钟是时间测量的基准和核心组成部件,其性能直接决定导航、定位和授时的质量。在轨原子钟性能评估是保证卫星导航系统正常运行的前提和基础,对于原子钟产品性能改进具有重要的参考价值。介绍了原子钟性能评估的主要参数和评估方法。分析和对比了北斗与GPS原子钟钟差数据,结果表明:北斗二号与GPS相比,铷原子钟的准确度、稳定度和漂移率有一定的差距;北斗三号搭载了铷原子钟和氢原子钟,性能指标均有较大的提升,氢原子钟10天稳定度和天稳定度普遍达到了10^(−15)量级,其性能指标与GPS相当;最新的GPS Block IIF型卫星搭载的铷原子钟长期频率稳定度有了显著的提升,国产铷原子钟的性能指标还有进一步提升的空间。
In the satellite navigation system,the atomic clock is the time measurement benchmark and the core component.Its performance directly determines the quality of navigation,positioning and time service.The performance evaluation of in-orbit atomic clock is the precondition and foundation to ensure the normal operation of satellite navigation system,and also has important reference value for the improvement of atomic clock product performance.The main parameters and evaluation methods of atomic clock performance evaluation are introduced.The clock difference data between Beidou and GPS atomic clocks is analyzed and compared.The results show that the accuracy,stability and drift rate of the Beidou-2 rubidium atomic clock are different from those of the GPS atomic clock.Beidou-3 is equipped with rubidium atomic clocks and hydrogen atomic clocks,and its performance indicators have been greatly improved.The 10 days stability and daily stability of hydrogen atomic clocks have generally reached the 10^(−15) level,and their performance indicators are equivalent to GPS.The longterm frequency stability of the rubidium atomic clock carried by the latest GPS Block IIF satellite has been significantly improved,and the performance indicators of the domestic rubidium atomic clock need to be further improved.
作者
张照瑞
廉吉庆
ZHANG Zhaorui;LIAN Jiqing(Science and Technology on Vacuum technology and physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)
出处
《真空与低温》
2024年第6期691-696,共6页
Vacuum and Cryogenics
基金
真空技术与物理重点实验室基金(6142207220102)。
关键词
星载原子钟
在轨性能评估
准确度
漂移率
稳定度
space-borne atomic clock
in-orbit performance evaluation
accuracy
drift rate
stabiIity
