Methods, devices and systems for determining the zero rate output of a sensor
US8649999B1 · kind B1 · utility
6Cited by
2References
24Claims
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Key dates
| Filing date | Dec 27, 2010 |
| Grant date | Feb 11, 2014 |
| Priority date | — |
| Expiry date | Jun 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/42222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bias value associated with a sensor, e.g., a time-varying, non-zero value which is output from a sensor when it is motionless, is estimated using a ZRO-tracking filter which is a combination of a moving-average filter and a Kalman filter having at least one constraint enforced against at least one operating parameter of the Kalman filter. It achieves faster convergence on an estimated bias value and produces less estimate error after convergence. A resultant bias estimate may then be used to compensate the biased output of the sensor in, e.g., a 3D pointing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.