GB/T 39787-2021 in English
VALIDCoordinate system of BeiDou navigation satellite system
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39787-2021北斗卫星导航系统坐标系》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 definition of the BeiDou Coordinate System
According to the GB/T39787-2021 standard, the BeiDou Coordinate System (BDCS) adopts a definition system that is completely consistent with CGCS2000:
| Elements | Definition specifications | Technical parameters |
|---|---|---|
| Origin | Earth mass center | Including total mass of the atmosphere |
| Scale reference | Meters (m) | TCG time coordinate synchronization |
| Z-axis orientation | IERS reference pole | No overall rotation evolution |
Key technical parameters of reference ellipsoid
The reference ellipsoid specified in the standard adopts the four-defined constant system:
- Semimajor axis: 6378137.0m
- Gravitational constant: 3986004.418×108m3/s2
- Oblate: 1/298.257222101
- Angular rotation speed: 7.292115×10-5rad/s
Among the special application constants, the geodynamic oblateness H=1/305.4413 is particularly critical for high-precision positioning.
Technical requirements for coordinate system implementation
Reference station construction specifications
The standard requires that the Beidou reference station must meet the following requirements:
- Construction of bedrock observation piers, settlement displacement <3mm/year
- Global distribution uniformity deviation ≤15°
- Obstacle height angle limit 15°
Framework maintenance and update mechanism
| Update type | Trigger condition | Accuracy requirement |
|---|---|---|
| Regular update | Annual regularity | Horizontal 3cm/elevation 5cm |
| Special update | Single station overrun | Coordinate component change>3cm |
| Model update | Major parameter change | Full network re-solution |
Key points for implementing coordinate conversion
Analysis of the applicability of the seven-parameter conversion model:
When the conversion area is >500km, the conversion parameters need to be set in different areas. Priority for selecting common points:
- Dual-system high-precision ground point (error <1cm)
- Precise ephemeris solution point (error <5cm)
- Broadcast ephemeris auxiliary point (error <1m)
Standard implementation recommendations
Implementation plans for different application scenarios:
- High-precision mapping: The latest framework version (BDCS(YYYY.DOY)) must be used
- Navigation application: Framework versions within 3 years are acceptable
- Emergency response: Rapid conversion using broadcast ephemeris is allowed
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