Correction method for vehicle-mounted geomagnetic field sensors
US4660161A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1984 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Jun 14, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A correction method for a geomagnetic field sensor (11) of a bearing indication system (10) mounted on a vehicle including a signal processor (13) for processing an output signal (Vx, Vy) of the sensor. The signal processor includes a storing function (15), comprising steps of storing the output signal of the sensor as data (6) of the bearing of the vehicle, while the vehicle is traveling, and computing a bearing correction vector (Xoff, Yoff) for correcting the output signal of the sensor on the basis of the stored bearing data. When the vehicle is judged to be subjected to a strong magnetic field, the bearing data stored may be all cleared. The bearing correction vector may be updated each time when a predetermined period of time is elapsed or the vehicle has traveled a predetermined distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.