Error modeling of precision orientation sensors in a fixed base simulation
Abstract
A fixed base simulator was developed and used in developing methods of instrument error modeling and performance evaluation applicable to relativity experiment sensors and other precision pointing instruments. Atlas missile gyros, integrated into a Minuteman 1 guidance assembly, and two specially designed autocollimators were used as analogs to the relativity experiment sensors. A spectral approach was used in analyzing the fixed base simulator signals and developing error models for the sensors. Comparisons are made of gyro and automocollimator spectra taken with the instruments resting on quiet test beds and serving as feedback sensors in platform stabilization loops. Coherency between signals was used to indicate mutual instrument error sources and to provide confidence in the estimation of system transfer functions. Analysis of autocollimator spectra uncovered the presence of a platform gimbal resonance. The source of the resonance was isolated to gimbal bearing elastic restraint properties most apparent at small levels of motion. A model of these properties which include elastic and coulomb friction characteristics is discussed, and a describing function developed.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1974
- Bibcode:
- 1974PhDT........49K
- Keywords:
-
- Error Analysis;
- Instrument Errors;
- Instrument Orientation;
- Collimators;
- Elastic Properties;
- Gimbals;
- Gyroscopes;
- Sensors;
- Stabilized Platforms;
- Instrumentation and Photography