Navigation Error
Author: Tianjiang Says
Website: https://cislunarspace.cn
Definition
Navigation error refers to the deviation between the determined orbital state (through ground-based tracking or autonomous navigation) and the true orbital state. Navigation error is an important error source in orbit keeping control, directly affecting control strategy accuracy and fuel consumption.
Error Sources
| Error Type | Description |
|---|---|
| Measurement noise | Random errors in range, range-rate, and angle observations |
| Model error | Orbit prediction deviations due to imprecise dynamical models |
| Time synchronization error | Errors due to inaccurate observation time tagging |
| Reference frame error | Errors in ground station coordinates, Earth rotation parameters, etc. |
Impact on Orbit Keeping
In DRO orbit keeping control, the effects of navigation error include:
- Reduced control accuracy: Navigation errors cause discrepancies between computed and actual required control maneuvers
- Increased fuel consumption: Imprecise navigation information may lead to excessive or misdirected control maneuvers
- Coupling with actuator errors: The combined effect of navigation and actuator errors further degrades control performance
Related Concepts
References
- Chen Yuju. DRO Orbit Design and Control Research for Cislunar Space Situation Awareness[D]. 2024.