Apparatus and method for measuring forward direction of vehicle
US5131155A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Jan 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for measuring a forward direction of a vehicle in which to derive a coordinate position of a center (O.sub.x, O.sub.y) of a directional circle derived from an output of a geomagnetic direction sensor after a magnetization on a vehicle body occurs, the magnetization on the vehicle body is determined from the output of the geomagnetic direction sensor installed in the vehicle and each parameter of a peak quantity (X.sub.max, Y.sub.max), peak direction (D.sub.x, D.sub.y), and a center value of an output circle before the present disturbance occurs is calculated, optimum coefficients are selected and set according to each parameter from among the previously derived coefficients, a magnetization quantity is calculated from each parameter and each optimum coefficient using a linear combination technique, and the coordinate position of the center of the output circle after the magnetization on the vehicle body occurs from the derived magnetization quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.