Vehicular traveling direction measuring system
US5251139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1990 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Nov 1, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring a traveling direction of a vehicle includes a geomagnetic sensor and a gyro sensor. The system utilizes first and second indicies for deriving the vehicle traveling direction. The first index is indicative of disturbance of a geomagnetic field on a short interval basis, and the second index is indicative of disturbance of the geomagnetic field on a long interval basis. The system further utilizes a correction value indicative of a drift error caused by the gyro sensor for deriving the vehicle traveling direction. The system varies a rate of dependence upon an output of the geomagnetic sensor and an output of the gyro sensor based on the first and second indicies and the correction value when calculating the vehicle traveling direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.