中国物理B ›› 2024, Vol. 33 ›› Issue (9): 90601-090601.doi: 10.1088/1674-1056/ad6131

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A real-time performance improvement method for composite time scale

Fangmin Wang(王芳敏)1,2, Wenlin Li(李汶林)1,2, Hongfei Dai(戴鸿飞)1,2, Chunyi Li(李春怡)1,2, Jianhua Zhou(周建华)3, Shenhui Xue(薛申辉)3, and Bo Wang(王波)1,2,†   

  1. 1 State Key Laboratory of Precision Space-time Information Sensing Technology, Department of Precision Instrument, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China;
    3 Beijing Satellite Navigation Center, Beijing 100094, China
  • 收稿日期:2024-02-12 修回日期:2024-06-25 接受日期:2024-07-10 发布日期:2024-08-27
  • 通讯作者: Bo Wang E-mail:bo.wang@tsinghua.edu.cn
  • 基金资助:
    Project supported in part by the National Key Research and Development Program of China (Grant No. 2021YFA1402102), the National Natural Science Foundation of China (Grant No. 62171249), and the Fund by Tsinghua University Initiative Scientific Research Program.

A real-time performance improvement method for composite time scale

Fangmin Wang(王芳敏)1,2, Wenlin Li(李汶林)1,2, Hongfei Dai(戴鸿飞)1,2, Chunyi Li(李春怡)1,2, Jianhua Zhou(周建华)3, Shenhui Xue(薛申辉)3, and Bo Wang(王波)1,2,†   

  1. 1 State Key Laboratory of Precision Space-time Information Sensing Technology, Department of Precision Instrument, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China;
    3 Beijing Satellite Navigation Center, Beijing 100094, China
  • Received:2024-02-12 Revised:2024-06-25 Accepted:2024-07-10 Published:2024-08-27
  • Contact: Bo Wang E-mail:bo.wang@tsinghua.edu.cn
  • Supported by:
    Project supported in part by the National Key Research and Development Program of China (Grant No. 2021YFA1402102), the National Natural Science Foundation of China (Grant No. 62171249), and the Fund by Tsinghua University Initiative Scientific Research Program.

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摘要： The composite time scale (CTS) provides a stable, accurate, and reliable time scale for modern society. The improvement of CTS's real-time performance will improve its stability, which strengths related applications' performance. Aiming at this goal, a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this paper. The determinants of the CTS's calculation interval (characteristics of the clock ensemble, the measurement noise, the time and frequency synchronization system's noise and the auxiliary output generator noise floor) are studied and the optimal calculation interval is obtained. We also investigate the effect of ensemble algorithm's initial parameters on the CTS's adjustment stage. A strategy to get the reasonable initial parameters of ensemble algorithm is designed. The results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial parameters. On this basis, we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than $\sim 1700 $ s. The experimental result proves that the CTS's real-time performance is significantly improved.

关键词: composite time scale, real-time performance, calculation interval, adjustment stage

Abstract: The composite time scale (CTS) provides a stable, accurate, and reliable time scale for modern society. The improvement of CTS's real-time performance will improve its stability, which strengths related applications' performance. Aiming at this goal, a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this paper. The determinants of the CTS's calculation interval (characteristics of the clock ensemble, the measurement noise, the time and frequency synchronization system's noise and the auxiliary output generator noise floor) are studied and the optimal calculation interval is obtained. We also investigate the effect of ensemble algorithm's initial parameters on the CTS's adjustment stage. A strategy to get the reasonable initial parameters of ensemble algorithm is designed. The results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial parameters. On this basis, we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than $\sim 1700 $ s. The experimental result proves that the CTS's real-time performance is significantly improved.

Key words: composite time scale, real-time performance, calculation interval, adjustment stage

中图分类号:  (Time and frequency)

  • 06.30.Ft
06.20.-f (Metrology)