GB/T 42577-2023 in English

Analysis of the core content of the standard

This standard systematically defines for the first time six major categories of key parameters of BeiDou/GNSS satellites in high-precision applications:

Key Technology Breakthroughs

1. Satellite Attitude Control Modeling

The standard specifies the calculation methods of three attitude modes for the first time:

• Dynamic Yaw Mode: When the solar altitude angle β≥β₀, the yaw angle ψₘ=arctan(Sₒᵧ/Sₒₓ)
• Maneuvering Yaw Mode: When β<β₀, piecewise function calculation is used
• Bias mode: Keep ψₘ=0°

Standardized file system

1. Satellite information file format

A hierarchical data structure is adopted. The key fields include:

 +SATEINFO SYSTEM | SVN | COSPAR-ID | PRN SOLARPRESSURE Satellite component 1 shape/orientation/material coefficient-SATEINFO

2. Phase center file specification

ANTEX format enhancement:

• Add Beidou frequency point identification (C01-B1c, C05-B2a)
• Supports absolute/relative phase center values
• Typical data block example:

   START OF FREQUENCY C02 600.00 0.00 1100.00 NORTH/EAST/UP NOAZI 0.00 0.00 0.00... END OF FREQUENCY

Implementation Suggestions

1. Data update mechanism: It is recommended to check the satellite quality, optical pressure coefficient and other variable parameters every month
2. Multi-system compatibility: GPS/GLONASS equipment delay needs to be corrected according to the ISB parameters in Appendix E
3. Accuracy verification: PCV model verification is performed using iGMAS station network data

Typical problem solutions