System for measuring the position of vibrating object
US4888705A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1987 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Oct 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring the position of a vibrating object relative to a reference point, such as the block of a ring-laser gyroscope relative to its case, uses a continuous velocity sensor that is noisy and subject to drift and a precise position crossing detector. A mixer-filter combines the data from the two sensors so that the capability of the velocity sensor to provide a continuous reading of position is exploited to interpolate data between the instants that the position crossing detector indicates that the object position crosses through zero. The mixer-filter is implemented in the form of an extended Kalman filter which operates upon the inputs to provide an optimum estimate of the position of the vibrating object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.