GB/T 45446-2025Interface specification for signal in space of Beidou navigation satellite system precise point positioning service (English PDF)

北斗卫星导航系统精密单点定位服务空间信号接口规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 28, 2025

Implementation date

March 28, 2025

Scope

GB/T 45446-2025 is the English-translated version of 北斗卫星导航系统精密单点定位服务空间信号接口规范.

GB/T 45446-2025 is the Chinese national standard covering the PPP-B2b signal that BeiDou-3 geostationary satellites broadcast to carry precise orbit and clock corrections — the signal structure, modulation and received power level at the ground, the ranging code, the navigation message format and the satellite orbit, clock and code bias corrections it carries, the validity period after which a correction may no longer be used, and the multi-ary LDPC coding. The corrections travel on the navigation signal itself, so a user needs no ground link to receive them. At 21,500 words. First edition, under the Equipment Development Department of the Central Military Commission. In force from 28 March 2025. Issued on 28 March 2025, it has been in force since 28 March 2025.

Document preview — GB/T 45446-2025

National Standard of the People's Republic of China

ICS: 49.020
Classification: V 04

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
IntroductionIV
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Abbreviations1
5 Overview of BeiDou Satellite Navigation System2
5.1 Space Constellation2
5.2 Coordinate system2
5.3 Time system3
6 Signal characteristics3
6.1 Signal Structure3
6.2 Signal Modulation3
6.3 Logic Level4
6.4 Polarization4
6.5 Carrier Phase Noise4
6.6 Spurious4
6.7 Correlation loss4
6.8 Data/Code Consistency4
6.9 Signal Consistency4
6.10 Ground receiving power level4
7 Ranging Code Characteristics5
8 Navigation message6
8.1 Information Format6
8.2 Information Content9
8.3 Information validity period23
8.4 PPP-B2b Information Enhancement Object23
8.5 Time-Space Coordinate System23
8.6 Satellite code bias correction23
8.7 Satellite Orbit Correction24
8.8 Satellite clock correction24
8.9 User distance measurement accuracy24
8.10 System time calculation24
Appendix A (Informative) Multi-binary LDPC encoding and decoding method and examples25
A.1 Multi-level LDPC coding25
A.2 Multi-ary LDPC decoding26

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.

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/TC544).

This document was drafted by: China Satellite Navigation Engineering Center, China Satellite Navigation System Management Office, Beijing Satellite Navigation Center, China Institute of Aerospace Standardization, Wuhan University, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Huazhong University of Science and Technology, and Beijing Institute of Telemetry Technology.

The main drafters of this document are: Gao Weiguang, Su Chengeng, Chen Liang, Guo Shuren, Wang Chenglong, Lu Yun, Li Xing, Gao Yang, Lou Yidong, Song Weiwei, Tang Chengpan, Tang Zuping, Gao Lifeng, Zheng Fu, Wang Weijia, Chen Ying, Li Gang, Zhou Wei, Yang Xiaoheng, Chen Zhengkun, Su Mudan, Zhu Zhiyong, Sun Weibin.

Introduction

The BeiDou satellite navigation system is divided into three stages of construction and development. BeiDou-1, BeiDou-2 and BeiDou-3.The BeiDou-3 system provides multiple The company provides a variety of services, including. providing global positioning, navigation and timing (RNSS), global short message communication (GSMC) and international search and rescue (SAR) Services. Provide precise point positioning (PPP), satellite-based augmentation (SBAS), ground-based augmentation (GAS) and regional short message in China and surrounding areas Communication (RSMC) service. Among them, the BeiDou-3 system PPP service is provided through the PPP-B2b of the BeiDou-3 geostationary orbit (GEO) satellite.

Signal provision, PPP-B2b signal is used as a data broadcast channel to broadcast the BeiDou-3 system and other global satellite navigation systems (GNSS) precision Satellite orbit and clock correction parameters are used to provide PPP services to users in China and surrounding areas.

This document is a technical document issued by the China Satellite Navigation System Management Office, "Beidou Satellite Navigation System Space Signal Interface Control Document" It is compiled based on the Precision Point Positioning Service Signal PPP-B2b (Version 1.0) of the BeiDou-3 system, which mainly defines the PPP service space of the BeiDou-3 system.

Signal PPP-B2b related content, including space signal characteristics, ranging code characteristics, navigation message structure, navigation message parameters and user algorithm The formulation and implementation of this document will provide reference and guidance for the development, production and inspection of satellite navigation products using PPP-B2b signals. Guiding effect.

Beidou satellite navigation system precise point positioning service space Signal interface specifications

1 Scope

This document specifies the signal characteristics, ranging code characteristics, Navigation message structure and user algorithm.

This document applies to the development, production and inspection of satellite navigation products using PPP-B2b signals.

2 Normative references

GB/T 39267

3 Terms and definitions

The terms and definitions defined in GB/T 39267 apply to this document.

4 Abbreviations

The following abbreviations apply to this document.

BDCS. BeiDou Coordinate System BDS. BeiDou Navigation Satellite System BDT. Beidou Time (BDSTime) BPSK. Binary Phase Shift Keying CGCS2000 2000 China Geodetic Coordinate System (ChinaGeodeticCoordinateSystem2000) CRC. Cyclic Redundancy Check DCB. Differential Code Biases GALILEO.Galileo satellite navigation system GEO. Geostationary Earth Orbit GF. Galois Field GLONASS. Global Navigation Satellite System GNSS. Global Navigation Satellite System GPS. Global Positioning System IERS. International Earth Rotation and Reference Systems Service IGSO. Inclined GeoSynchronous Orbit IOD. Issue of Data IODC. Issue of Data Clock

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 39267Terminology for BeiDou navigation satellite system (BDS)

Editions of GB/T 45446

Edition	Title	Revision	Status
GB/T 45446-2025	Interface specification for signal in space of BeiDou navigation satellite system precise point positioning service	current edition	Current

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