GB/T 39396.1-2020 in English
VALIDQuality requirements for international GNSS monitoring and assessment system (iGMAS)—Part 1:Observation data
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39396.1-2020全球连续监测评估系统（iGMAS）质量要求 第1部分：观测数据》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
Interpretation of the core content of the standard
GB/T 39396.1-2020 is my country's first national standard for observation data of the iGMAS system, which has established a full-chain quality indicator system covering data collection, processing and evaluation. The standard is applicable to key links such as the development of GNSS receivers and the site selection of tracking stations.
Comparison of key technical indicators
| Indicator items | Technical requirements | Applicable scenarios | Sampling requirements |
|---|---|---|---|
| Data integrity rate | ≥90% | System/single frequency | 30s |
| Cycle slip ratio | ≥500 | System level | 30s |
| Multipath error | ≤0.5m | Single frequency/satellite | 30s |
| Pseudorange noise | 6-18cm | Signal type | 1s |
Key points for the implementation of key indicators
Cycle slip ratio detection technology
The standard innovatively adopts the MW-GF combined detection method:
- The MW combination detects large cycle slips through the dual-frequency carrier phase and pseudorange combination values (Formula 4-5)
- The GF combination detects small cycle slips through the geometrically independent combination values (Formula 6-7)
Multipath Error Control
For different signal frequency band characteristics (B1C/L1/E1, etc.), the standard requires:
- Use dual-frequency observation data for calculation (Formula 8-10)
- Preprocessing is required to eliminate gross errors and repair clock jumps
- Typical scenarios: In urban canyon environments, it is recommended to increase the observation time to more than 24 hours
Standard Evolution and Innovation
Compared with international standards such as ISO 17123-8, this standard has three major breakthroughs:
- Full system coverage: For the first time, the quality requirements of the four systems BDS/GPS/GLONASS/Galileo are unified
- Dynamic indicators: Introducing pseudorange/carrier phase noise detection at a high sampling rate of 1s
- Engineering applicability: Appendix A/B lists the signal frequencies and combinations of each system in detail
Implementation suggestions
1. Equipment selection: Select a multi-frequency GNSS receiver to ensure that the 10.23MCPS high bit rate signal requirements are met
2. Data processing: It is recommended to use a standardized algorithm package to process the MW-GF combination value
3. Quality monitoring: Establish an automated early warning mechanism to trigger an alarm when the carrier-to-noise ratio is <35dBHz
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