GB/T 39473-2020 in English
VALIDSpecifications for open service performance of BeiDou navigation satellite system
- Issued on:2020-11-19
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 39473-2020北斗卫星导航系统公开服务性能规范》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
Analysis of the core architecture of the BeiDou system
| Components | Satellite types | Orbital characteristics | Signal frequency band |
|---|---|---|---|
| Space segment | 3GEO+3IGSO+24MEO | GEO:35786km IGSO:55° inclination MEO:21528km | B1I/B3I/B1C/B2a |
| Ground segment | Master control station + time synchronization station + monitoring station + intersatellite link facilities | ||
Key Performance Indicators of Space Signals
The BeiDou system achieves performance breakthroughs through B1C and B2a signals:
- SISRE accuracy: B1C/B2a reaches 0.6m, 40% higher than B1I/B3I
- Continuity: MEO satellites reach 0.998/h, better than GEO’s 0.995/h
- Healthy status indicator: New SIF/DIF dual verification mechanism
Comparison of Global and Asia-Pacific Services
| Performance Dimensions | Global Services | Asia Pacific Region (55°S-55°N) |
|---|---|---|
| Positioning Accuracy (95%) | ≤10m | ≤5m |
| Timing Accuracy | ≤20ns | ≤10ns |
| PDOP Availability | ≥0.95 | ≥0.99 |
Technology Evolution and Implementation Recommendations
Standardization Background
Based on the optimization of measured data after the global service was launched in 2018, the key issues are:
- Quantification of multi-orbit satellite performance differences
- Performance specifications of new B1C/B2a signals
- Interoperability requirements with GPS/Galileo
Product development suggestions
- Preferentially adopt the dual-frequency B1C+B2a combination solution
- Pay attention to the continuity indicator differences of GEO satellites
- Need to be compatible with the four message formats of D1/D2/B-CNAV1/B-CNAV2
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