GB/T 39267-2020 in English

VALID

Terminology for BeiDou navigation satellite system (BDS)

Issued on:2020-11-19
Implemented on:2021-06-01
File Format:PDF
Delivery:Via email within 5 business days

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Standard No:	GB/T 39267-2020
Document status:	VALID
Title in English:	Terminology for BeiDou navigation satellite system (BDS)
Title in Chinese:	北斗卫星导航术语
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-11-19
Implemented on:	2021-06-01
Chinese Classification:	V70-Spacecraft in general
Professional Classification:	GB-National Standard
Related Keywords:	beidou navigation satellite system beidou satellite navigation system architecture terminology beidou navigation satellite system beidou system global satellite navigation system
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《GB/T 39267-2020北斗卫星导航术语》由TC544（全国北斗卫星导航标准化技术委员会）归口，主管部门为中央军委装备发展部。

Introduction

Standard Overview and Development Background

GB/T39267-2020 is China's first national terminology standard specifically for the Beidou Satellite Navigation System (BDS). It was proposed by the Equipment Development Department of the Central Military Commission and is under the jurisdiction of the National Beidou Satellite Navigation Standardization Technical Committee. The standard was released on November 19, 2020 and officially implemented on June 1, 2021.

Technical field	Number of terms	Core concepts
General basic terms	46	Navigation system classification, space-time benchmark, signal system
Engineering construction terms	112	Constellation design, satellite payload, ground control system
Application terms	143	Service performance, terminal equipment, positioning algorithm

Analysis of the core terminology system

1. System architecture terminology

BeiDou Navigation Satellite System (BDS) is clearly defined as "a global satellite navigation system developed, built and managed by China", with three major components:

Space segment: a hybrid constellation consisting of three types of orbital satellites: MEO, IGSO and GEO
Ground segment: an operation and control network consisting of master control stations, injection stations and monitoring stations
User segment: terminal equipment supporting both RNSS and RDSS modes

2. Space-time reference terminology

Beidou Time (BDT) uses the International Atomic Time (IDT) seconds length, with the starting epoch being 00:00:00 UTC on January 1, 2006, and is expressed by week count (0-8191) and week seconds (0-604799). Compared with other system time standards:

System	Time Standard	Starting Epoch	Leap Second Processing
BDS	BDT	UTC2006	Continuous Time
GPS	GPST	UTC1980	Continuous Time
GLONASS	GLONASST	UTC1996	Discontinuous

Key Technical Indicators

1. Accuracy Indicators

SISaccuracy: URE≤2.5m (global service)
Positioning accuracy: horizontal 10cm (PPP service), vertical 15cm (PPP service)
Timing accuracy: 20ns (one-way), 10ns (two-way)

2. Service Performance Indicators

Indicator Type	Definition	BDS-3 Requirements
Availability	Percentage of Service Available Time	＞99%
Continuity	Probability of Uninterrupted Service	1×10^-4/h
Integrity	Fault alarm capability	6-second alarm

Implementation recommendations

Term application specifications: Strictly distinguish between Precise point positioning (PPP) and standard positioning services in technical documents
Equipment development: Multi-system receivers should support the conversion between BDCS coordinate system and ITRF framework
Test verification: Establish a BeiDou user equipment test system in accordance with Article 5.5.14 of the standard

This standard maintains technical coordination with international standards such as ISO 19134:2007 "Geographic Information - Location-based Services" and RTCA DO-229D, reflecting the global compatibility and interoperability of the BeiDou system.

More samples: JGJ 94-2008 NB/T 47013.2-2015 DL/T 368-2010

Sample only — not a preview of GB/T 39267-2020