GB/T 43423-2023Space data and information transfer systems—Deep space optical communications coding and synchronization (English PDF)
空间数据与信息传输系统 深空光通信编码与同步
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 27, 2023
Implementation date
March 1, 2024
Scope
GB/T 43423-2023 is the English-translated version of 空间数据与信息传输系统 深空光通信编码与同步.
GB/T 43423-2023 describes the data link layer coding and synchronization for optical communication between deep space craft and the ground.
It covers the functions of the sublayers, the coding and synchronization of downlink data and of uplink beacons with their optional accompanying transmission frames, and the management parameters for both directions.
Its contents list follows the downlink chain step by step - the attached synchronization marker, the chunker, the pseudo-random generator, the cyclic redundancy check, the SCPPM encoder, the channel interleaver, the slot mapper and guard slot insertion - and then the uplink chain with its LDPC encoder, PN spreader and 2-PPM slot mapper.
Clause 1 states that it applies to high photon efficiency links through atmospheric channels in deep space laser communication, other uses being for reference. Issued on 27 November 2023, it has applied since 1 March 2024.
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Document preview — GB/T 43423-2023
National Standard of the People's Republic of China
- ICS
- 49.140
- Classification
- V 75
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Abbreviations
- 5 General
- 5.1 Architecture
- 5.2 Function
- 5.3 Internal organization of downlink data encoding and synchronization sublayer
- 5.4 Internal organization of the coding and synchronization sublayer for uplink beacons and optional accompanying AOS/USLP transport frames
- 5.5-digit serial number convention
- 6 Encoding and synchronization of downlink data
- 6.1 Signal description
- 6.2 Transmitting frames
- 6.3 Additional synchronization identifier
- 6.4 Chunker
- 6.5 Pseudo-random generator
- 6.6 Adding Cyclic Redundancy Check (CRC)
- 6.7 Add termination bit
- 6.8 SCPPM Encoder
- 6.9 Channel Interleaver
- 6.10 Code synchronization identification
- 6.11 Repeat
- 6.12 Slot Mapper
- 6.13 Inserting protection time slot
- 6.14 Transmission frame validity confirmation
- 6.15 Sequence instructions
- 7 Coding and synchronization of upstream beacons and optional accompanying data transmission frames
- 7.1 Signal description
- 7.2 Beacon signals
- 7.3 Coding and synchronization sub-layer input
- 7.4 Additional synchronization identifier
- 7.5 Chunker
- 7.6 LDPC encoder
- 7.7 Pseudo-random generator
- 7.8 Channel Interleaver
- 7.9 Codeword synchronization identification
- 7.10 PN spreader
- 7.11 2-PPM slot mapper
- 7.12 Inserting protection time slot
- 7.13 AOS/USLP transmission frame validity confirmation and sequence indication
- 8 Management parameters
- 8.1 Management parameter description
- 8.2 Downlink data management parameters
- 8.3 Uplink data management parameters
- Appendix A (Normative) Service Definition
- Reference
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document describes the coding and synchronization of the data link layer in space-to-Earth optical communications in the context of deep space missions in the field of space data and information transmission.
Functions of the sublayers, encoding and synchronization of downlink data, encoding and synchronization of uplink beacons and optional accompanying data transmission, and management parameters.
This document is applicable to high photon efficiency links in air-to-ground and ground-to-space scenarios transmitted through atmospheric channels in the field of deep space laser communications. Other applications are used for reference.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.
GB/T 42041-2022 Aerospace terminology space data and information transmission
GB/T 43372-2023 Space data and information transmission system deep space optical communication physical layer
3 Terms and definitions
The terms and definitions defined in GB/T 42041-2022 and the following apply to this document.
3.1 Code rate
The ratio of the average number of input information symbols to the encoder to the average number of corresponding output symbols.
3.2 Code word
A data sequence that is output after encoding and processed as a whole during decoding. [Source: GB/T 42041-2022,3.3.13]
3.3 Convolution code
There is a certain relationship between the redundant code elements (check elements) added to the information code sequence and the current information code elements and the previous information code elements. An error correction code based on a functional relationship. [Source: GB/T 42041-2022,3.3.16]
3.4 Synchronization-markedtransferframe;SMTF
A data unit consisting of an Additional Synchronization Marker (ASM) and a transport frame.
4 Abbreviations
The following abbreviations apply to this document.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.
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Related Standards
GB/T 42041-2022 — Space terminology—Space data and information transfer
GB/T 43372-2023 — Space data and information transfer systems—Deep space optical communications physical layer
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