Method and apparatus to maintain compass heading with a moveable sensor mounting
US6418376B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Aug 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic compass system for use in an adjustable fixture in a vehicle such as an automobile including a sensor for detecting a magnetic field and for providing electrical signals representative of the direction of the vehicle with respect to the magnetic field. Relative position sensors provide electronic compass orientation relative to the vehicle. A circuit coupled to said sensing means resolve the direction and relative position electrical signals into a number of data points from which the detected direction of the vehicle may be calculated. The circuit also provides heading output signals representing heading information corresponding to the detected direction. An indicator coupled to the circuit provides an indication of the vehicle heading in response to said heading output signals, where the circuit includes a processor responsive to the direction electrical signals for determining a relative field strength of the magnetic field, for varying the resolution at which the circuit resolves the direction electrical signals into heading information as a function of the detected strength of the magnetic field, and for recalibrating the heading signal in response to sensor ori…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.