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GB/T 39414.2-2020: Interface specification for signal in space of BeiDou navigation satellite system - Part 2: Open service signal B2a
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Interface specification for signal in space of BeiDou navigation satellite system - Part 2: Open service signal B2a
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GB/T 39414.2-2020
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Basic data | Standard ID | GB/T 39414.2-2020 (GB/T39414.2-2020) | | Description (Translated English) | Interface specification for signal in space of BeiDou navigation satellite system - Part 2: Open service signal B2a | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | V04 | | Classification of International Standard | 49.020 | | Word Count Estimation | 54,591 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-06-01 | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39414.2-2020: Interface specification for signal in space of BeiDou navigation satellite system - Part 2: Open service signal B2a
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Interface specification for signal in space of BeiDou navigation satellite system-Part 2.Open service signal B2a
ICS 49.020
V04
National Standards of People's Republic of China
Beidou satellite navigation system space signal interface specification
Part 2.Public Service Signal B2a
2020-11-19 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions, abbreviations 1
3.1 Terms and definitions 1
3.2 Abbreviations 1
4 Overview of Beidou system 2
4.1 Space Constellation 2
4.2 Coordinate System 2
4.3 Time System 3
5 Signal characteristics 3
5.1 Signal structure 3
5.2 Signal Modulation 3
5.3 Logic level 4
5.4 Polarization mode 5
5.5 Carrier phase noise 5
5.6 Spurious 5
5.7 Related losses 5
5.8 Data/code consistency 5
5.9 Signal consistency 5
5.10 Ground received power level 5
6 Ranging code characteristics 6
6.1 Ranging code structure 6
6.2 B2a signal ranging code 6
6.3 Non-standard codes 14
7 Navigation message structure 14
7.1 Overview of navigation messages 14
7.2 B-CNAV2 navigation message 15
8 Navigation message parameters and algorithms 21
8.1 Ranging code number 21
8.2 Information Type 21
8.3 System time parameters 22
8.4 Message data version number 22
8.5 Clock difference parameters 24
8.6 Group delay correction parameter 24
8.7 Ephemeris parameters 25
8.8 Ionospheric delay correction model parameters 27
8.9 Medium precision almanac 32
8.10 Simple Almanac 35
8.11 Earth orientation parameters 35
8.12 BDT-UTC time synchronization parameters 36
8.13 BGTO parameters 38
8.14 Satellite health status 38
8.15 Satellite integrity status indicator 39
8.16 Spatial signal accuracy index 39
8.17 Spatial signal monitoring accuracy index 40
9 Compliance verification method 40
9.1 Overview 40
9.2 Signal characteristics verification method 40
9.3 Method for verifying the characteristics of the ranging code 40
9.4 Verification method of navigation message structure 40
9.5 Verification method of navigation message parameter algorithm 41
Appendix A (informative appendix) Multi-ary LDPC encoding and decoding methods and examples 42
Foreword
GB/T 39414 "Beidou Satellite Navigation System Space Signal Interface Specification" is divided into 4 parts.
---Part 1.Public service signal B1C;
---Part 2.Public service signal B2a;
---Part 3.Public service signal B1I;
---Part 4.Public service signal B3I.
This part is Part 2 of GB/T 39414.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the Equipment Development Department of the Central Military Commission.
This part is under the jurisdiction of the National Beidou Satellite Navigation Standardization Technical Committee (SAC/TC544).
Drafting organizations of this section. China Satellite Navigation Engineering Center, China Aerospace Standardization Institute, Beijing Satellite Navigation Center, China Aerospace Science
Technology Group Corporation Fifth Research Institute, Chinese Academy of Sciences Microsatellite Innovation Research Institute, Huazhong University of Science and Technology, Beihang University, Tsinghua University
Science, China Academy of Aerospace Electronics Technology.
The main drafters of this section. Su Chengeng, Gao Weiguang, Lu Yun, Ruan Hang, Wang Weijia, Quan Haofang, Gao Yang, Wang Wei, Wang Mengli, Tang Zuping, Huang Qin,
Yao Zheng, Ma Zhichao, Dong Haiqing, Lu Xinxing.
Introduction
The Beidou satellite navigation system is divided into three stages of construction and development. Beidou-1, Beidou-2 and Beidou-3.Beidou Satellite Navigation System
The previously released public service signals include B1I, B2I, B3I, B1C and B2a. Among them, the B1I and B3I signals are on Beidou 2 and Beidou 3
Broadcast on medium-circular earth orbit (MEO) satellites, tilted geosynchronous orbit (IGSO) satellites and geostationary orbit (GEO) satellites, providing
Open services; B2I signals are broadcast on all Beidou-2 satellites to provide public services and will be replaced by B2a signals on Beidou-3 satellites;
B1C and B2a signals are broadcast on Beidou-3 Medium Earth Orbit (MEO) satellites and Tilted Geosynchronous Orbit (IGSO) satellites to provide public services.
This part of GB/T 39414 mainly defines the relevant internal information of the public service signal B2a between the Beidou system space constellation and the user terminal.
Content, including space signal radio frequency characteristics, ranging code, navigation message structure, navigation message parameters and user algorithm, etc., can be used as Beidou satellite navigation
An important basis for product design, development and application.
Beidou satellite navigation system space signal interface specification
Part 2.Public Service Signal B2a
1 Scope
This part of GB/T 39414 specifies the communication between the Beidou satellite navigation system (hereinafter referred to as the Beidou system) space constellation and the user terminal.
Open service signal B2a's signal characteristics, navigation message structure and user algorithm, etc.
This section applies to the development, production and inspection of satellite navigation products using B2a signals.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 39267 Beidou satellite navigation terminology
3 Terms and definitions, abbreviations
3.1 Terms and definitions
The terms and definitions defined in GB/T 39267 apply to this document.
3.2 Abbreviations
The following abbreviations apply to this document.
AIF. System Alarm Identification
BDCS. Beidou Coordinate System
BDGIM. Beidou Global Ionospheric Delay Correction Model
BDS. Beidou Satellite Navigation System
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