Navigation system
US5703780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1995 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Jul 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation system comprises a vehicle position detecting unit for determining the present position of a vehicle from the amount of change in vehicle bearing and a distance traveled by the vehicle, a forward road data storage unit for reading a road existing ahead of the present vehicle position from a map data storage unit based on the present vehicle position detected by the vehicle position detecting unit and storing it therein as data, a change-in-road detecting unit for detecting a change-in-road section in which the orientation of the road greatly varies, from the stored forward road data and judging whether the change-in-road section exists within a range in which a notification is required, and a notification unit for notifying the present vehicle position to a driver and notifying a change-in-road section in which the notification has been judged necessary, to the driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.