GB/T 45434.1-2025 English PDF

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GB/T 45434.1-2025: China standard time - Part 1: General principle
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GB/T 45434.1-2025	279	Add to Cart	3 days	China standard time - Part 1: General principle	Valid

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JJF 1800   JJF 1835   JJF 1059.1   GB/T 45434.3   GB/T 45434.2   GB/T 43735   

Basic data

Standard ID: GB/T 45434.1-2025 (GB/T45434.1-2025)
Description (Translated English): China standard time - Part 1: General principle
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A50
Classification of International Standard: 33.060
Word Count Estimation: 14,184
Date of Issue: 2025-03-28
Date of Implementation: 3/28/2025
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 45434.1-2025: China standard time - Part 1: General principle

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Standard of the People's Republic of China ICS 33.060CCS A 50 China Standard Time Part 1.General 2025-03-28 Release 2025-03-28 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of contents

Preface Ⅲ Introduction Ⅳ 1 Scope...1 2 Normative references ...1 3 Terms, definitions and abbreviations 1 3.1 Terms and Definitions 1 3.2 Abbreviations 2 4 Overview ...2 5 CST Requirements 2 5.1 Generation Process 2 5.2 Resource Requirements 3 5.3 Performance requirements 3 6 Requirements for China Standard Time Physical Time ...3 6.1 System Requirements 3 6.2 Resource Requirements 3 6.3 Performance requirements 4 7 Comparison link requirements 4 7.1 General requirements 4 7.2 Performance Requirements 4 8 Information Release Requirements 4 8.1 General Information 4 8.2 Timing Information 4 9 Timing Service Requirements 4 9.1 Space-based Timing 4 9.2 Ground-based Timing 4 Appendix A (Informative) CST Calculation Method 6 A.1 Data Resources 6 A.2 Technical methods 6

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting is required. This document is Part 1 of GB/T 45434 China Standard Time. GB/T 45434 has been published in the following parts. --Part 1.General; --Part 2.Metadata; --Part 3.Communiqué. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the Equipment Development Department of the Central Military Commission. This document is under the jurisdiction of the National Beidou Satellite Navigation Standardization Technical Committee (SAC/TC 544). This document was drafted by. China Institute of Metrology, China Satellite Navigation Engineering Center, Beijing Satellite Navigation Center, Beijing Radio Institute of Metrology and Testing. The main drafters of this document are. Xiang Fang, Jiao Wenhai, Wang Yuzhuo, Zhang Aimin, Shi Fengfeng, Zhang Shengkang, Wang Xueyun, Liu Ying, Xu Qinghua, and Xu Jinfeng.

Introduction

Standard time is widely used in communications, transportation, finance, scientific research, national defense construction and many other fields, affecting human production and life. GB/T 45434 aims to clarify the generation, management and The service guidelines are to be composed of seven parts. --Part 1.General. The purpose is to establish the generation, maintenance, comparison, publication and timing services applicable to China Standard Time. Basic requirements. -- Part 2.Metadata. The purpose is to establish the content and format of data resources related to the generation and publication of China Standard Time. The metadata entity and metadata attributes are defined in the format. -- Part 3.Bulletin. The purpose is to establish the methods and requirements applicable to the compilation of the China Standard Time Bulletin. --Part 4.Reference clock. The purpose is to establish the reporting, use and evaluation of reference clocks applicable to the generation of China standard time. Related requirements. --Part 5.Comparison link. The purpose is to establish the BeiDou/Global Satellite Navigation System applicable to the generation of China's standard time. Requirements for the use, management and maintenance of GNSS, satellite two-way and optical fiber time and frequency comparison links. -- Part 6.Broadcasting. The purpose is to establish the requirements applicable to technical organizations for broadcasting China's standard time signal. -- Part 7.Monitoring. The purpose is to establish the requirements applicable to technical organizations monitoring the Chinese standard time signal. China Standard Time Part 1.General

1 Scope

This document specifies the generation, maintenance, comparison, publication and timing service requirements of China Standard Time. This document applies to the generation, management and services of China Standard Time.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document. document. GB/T 39267 Beidou Satellite Navigation Terminology GB/T 45434.3 China Standard Time Part 3.Communiqué JJF 1180 Time and frequency measurement terms and definitions 3 Terms, definitions and abbreviations 3.1 Terms and Definitions The terms and definitions defined in GB/T 39267 and JJF 1180 and the following apply to this document. 3.1.1 Primary/secondary frequency standard A device that reproduces the SI second or subsecond definitions. 3.1.2 clock ensemble time scale The free atomic time is calculated by weighted average of the atomic clocks and comparison link data provided by various timekeeping laboratories. 3.1.3 China atomic time The time produced by the clock group jointly produced by the China Standard Time Keeping Laboratory is adjusted with reference to PSFS or UTC. 3.1.4 China Standard Time The time after the leap second adjustment of China Atomic Time. Note. The starting point of CST is 00.00.00 on January 1, 2020 (UTC), and the unit is SI seconds (s). 3.1.5 physical realization of China standard time The China Standard Time Keeping Laboratory established and maintains the physical realization of CST. Note. China Standard Time is represented by CST(k), where k is the unit code of the laboratory. Beijing Institute of Radio Measurement and Testing (BIRM), Beijing Satellite Navigation Center (BSNC), National Institute of Metrology (NIM) and Chinese Academy of Sciences National Time Service Center (NTSC). ......

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