Radio searching system
US5835017A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1996 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Jul 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/016
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a radio searching system, a present position of an object under search such as a mentally handicapped aged person and a mountain climber is correctly defined and displayed by utilizing the characteristics of the radio signals. The radio searching system is comprised of a portable radio unit for transmitting a radio signal having a predetermined frequency, searching radio units provided at a plurality of searching points, for receiving the radio signal transmitted from the portable radio unit, a position defining unit for defining a position of an object under search on which the portable radio unit is mounted based on the transmission direction of the radio signal received by the searching radio unit, and an image display unit for displaying on an image, the position of the object under search defined by the position defining unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.