GB/T 39353-2020 in English
VALIDSpace data and information transfer systems—Proximity space link protocol—Synchronization and coding sublayer
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 39353-2020 |
| Document status: | VALID |
| Title in English: | Space data and information transfer systems—Proximity space link protocol—Synchronization and coding sublayer |
| Title in Chinese: | 空间数据与信息传输系统 邻近空间链路协议 同步和编码子层 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| ICS Classification: | 49.140-Space systems and operations |
| Chinese Classification: | V75-Spacecraft telemetering and remote sensing system |
| Professional Classification: | GB-National Standard |
| Related Keywords: | information transfer systems proximity space link protocol synchronization
space data systems space data gb/t39352 data link layer csm synchronization coding scheme comparison |
| Related Topics: | atomic space group
atomic space long chain code Steady upper space space version near Coding Strand and Complementary Strand atomic space GBT39353 GB/T 39353-2020 Information transfer |
《GB/T 39353-2020空间数据与信息传输系统 邻近空间链路协议 同步和编码子层》由TC425（全国宇航技术及其应用标准化技术委员会）归口，TC425SC3（全国宇航技术及其应用标准化技术委员会空间数据与信息传输分会）执行，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
GB/T39353-2020 specifies the synchronization and coding sublayer technical specifications for adjacent links (1m-100,000km range) in space data systems, as a core component of the GB/T39352 data link layer. This standard is modified to adopt ISO21459:2015, and the main technical differences are reflected in the PLTU structure optimization and LDPC coding enhancement.
Key Technical Elements
| Technical Modules | Core Requirements | Implementation Points |
|---|---|---|
| PLTU Structure | ASM(0xFAF320)+Transmission Frame+CRC32 | Maximum 2055 bytes, CRC only checks the frame body |
| Idle Data | Pseudo-random sequence 0x352EF853 | Divided into three sequences: capture/idle/end |
| Channel Coding | Convolutional code (1/2, k=7) or LDPC (1024/2048) | LDPC requires pseudo-randomization and CSM synchronization |
Coding scheme comparison
In practical applications, convolutional coding is suitable for scenarios with high real-time requirements, while LDPC coding can achieve a 2dB coding gain at a bit error rate of 10⁻⁶. After a Mars rover mission adopted LDPC coding, the frame error rate was reduced to 1E-7 at a rate of 2Mbps.
Implementation recommendations
- Capture sequence length should be ≥ 4 CSM cycles (when LDPC encoding)
- CRC32 check is recommended to be implemented with hardware acceleration
- The initial value of the pseudo-random sequence generator must be set to all 1s
Standard evolution analysis
Compared with ISO21459:2015, the main improvements of this standard include: deleting non-essential appendices, strengthening LDPC encoding specifications, and clarifying the time tag collection mechanism. These modifications make the protocol more suitable for the high-reliability transmission requirements of my country's deep space exploration missions.
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