A time-invariant error model for a space-stable inertial navigation system
Abstract
A reduced-order, time-invariant, error model is developed for a class of space-stable systems using electrostatic gyroscopes. Its structure displays more clearly the dynamical characteristics of the system's errors than a commonly used equivalent periodic model. The order reduction results from aggregating gyroscopic errors into observable linear combinations that directly affect platform misalignment. Time-invariance of the model permits a modal analysis of navigation errors which shows the strong interplay between Schuler-loop dynamics, gyroscopic error dynamics, and observability and controllability properties of the system. The results clearly demonstrate the importance of choosing the proper coordinate frame for specifying shaping filters to model instrument error sources.
- Publication:
-
Guidance and Control Conference
- Pub Date:
- 1982
- Bibcode:
- 1982guco.conf..266C
- Keywords:
-
- Dynamic Characteristics;
- Electrostatic Gyroscopes;
- Inertial Navigation;
- Instrument Errors;
- Space Platforms;
- Surface Navigation;
- Accelerometers;
- Coordinates;
- Error Analysis;
- Misalignment;
- State Vectors;
- White Noise;
- Space Communications, Spacecraft Communications, Command and Tracking