Vehicular traveling direction measuring system
US5023799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1990 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Feb 6, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system measures a traveling direction of a vehicle based on a direction toward a coordinate position defined by outputs of a geomagnetic sensor from a first coordinate position of a center of a corresponding output circle. The system utilizes a preliminary coordinate position as a preliminarily corrected value of the first coordinate position, a first value indicative of accuracy of the preliminary coordinate position and a second value which is variable depending on a variation in a magnetization level on a vehicle body. The system derives a finally corrected value of the first coordinate position based on the preliminary coordinate position and a latest value of the finally corrected value which has been derived in a prior execution of the system, by changing a rate which determines a point of the current finally corrected value between the latest finally corrected value and the preliminary coordinate position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.