Spacecraft roll-yaw compensator with orbit-rate and harmonic bandpass filters
US5343398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64G1/363
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pitch momentum stabilized spacecraft includes an earth sensor for generating roll signals. The roll signals are applied to torquers for proportional (P) or proportional-integral PI control of roll and yaw. According to the invention, the sensed roll signals are bandpass filtered at the orbit rate, phase adjusted and applied to the roll and yaw torquers for closing a high gain degenerative feedback loop at the orbit rate, which reduces orbit-rate components of roll and yaw. A second bandpass filter at the second harmonic of the orbit rate is also connected to the earth sensor, for producing second harmonic signals, which are phase controlled and summed with the fundamental orbit rate signals, for degeneration of attitude perturbations occurring at twice the orbit frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.