Position information management system
US6999779B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1997 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Jul 29, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2205/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position information management system in which a portable remote terminal includes a plurality of kinds of positioning means for positioning based on a GPS, positioning based on a portable-telephone or PHS base station, positioning based on a radio marker, and independent positioning based on a direction detector, so that the holder of the portable remote terminal can be navigated anywhere. The holder of the portable remote terminal can know the position of a third party similarly holding such a portable remote terminal, by inquiring of a central system, and he/she can supervise, for example, the action of an old person, a child, or a skier in a skiing area. Further, only the map data of a district which is often used by the holder is stored in the portable remote terminal. In this regard, when the holder is in a district not contained within the retained map data, he/she downloads corresponding map data from the central system and uses the downloaded map data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.