The strategy integrated precise orbit determination
| Item | Models and constraints |
|---|---|
| Basic observable | Un-differencediono-free code and phase combination of L1/L2 and B1/B2 |
| Sampling rate | 300 s |
| Arc length | 3 days |
| Cutoff elevation | 7° |
| Weighting | Elevation dependent |
| Station phase center | igs08.atx |
| Satellite phase center | Recommended PCO of MGEX for all BeiDou; igs08.atx for GPS |
| Phase wind up | Corrected |
| Tropospheric delay | GMF, priori delay, 2-h ZTD without gradients |
| Satellite clock error | White noise |
| Receiver clock error | White noise |
| Station coordinates | Fixed |
| Tide displacement | IERS conventions 2003, FES2004 |
| Relativity effect | IERS conventions 2003 |
| Earth gravity | EIGEN_GL04C up to 12 × 12 |
| EOP | IERS C04 Fixed |
| N-body gravitation | Sun, moon, and other planets |
| Solar radiation | ECOM model five parameters without a background model |
| Attitude model | Orbit normal for GEO, yaw steering and orbit normal for IGSO and MEO |
| Atmospheric drag | Not considered |