Car mounted navigation system
US5204817A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Feb 8, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/0969
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A car mounted navigation system uses map data of polygons defined by roads of a predetermined rank or more of significance, connects a starting polygon containing a starting point to a destination polygon containing a destination with a chain of polygons adjoining at common sides of each pair of adjoining polygons and arranged between the starting and destination polygons to compute a plurality of routes extending from the starting point to the destination polygon, each route including a combination of sides of the chain polygons, the starting polygon and the destination polygon. A car operator selects an appropriate route from the computed routes. The system requires neither need for a great amount of database-made map data nor need for an entry of map data with a digitizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.