Offset correction apparatus of turning angular velocity sensor
US5296855A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Nov 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C25/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An offset correction apparatus comprising a turning angular velocity sensor, a vehicle speed sensor for outputting a pulsed signal every constant distance traveled by a vehicle, a stop determining unit for determining that the vehicle is at a stop, an offset calculation unit for integrating an output of the turning angular velocity sensor during a period of time that the stop of the vehicle is determined by the stop determining unit and then calculating an offset value of the output of the turning angular velocity sensor, a storage unit to store the offset value calculated by the offset calculation unit, and a heading correction unit for correcting heading data obtained from the output of the turning angular velocity sensor, with the offset value, wherein when the pulsed signal from the vehicle speed sensor disappears and the output from the turning angular velocity sensor is less than a threshold, the stop determining unit determines that the vehicle is at a stop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.