Personal security system with weighted receiver locations
US5898367A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/009
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A personal security system uses conversion factors that exaggerate the influence of signal strength to locate transmitting communicators. The system includes an alarm center, portable communicators for transmitting wireless signals and a plurality of fixed receivers in known positions for monitoring the transmissions and detecting the signals. Transmitted information, including signal strength, is forwarded from the receivers to the alarm center. A transmitting communicator is located by the system using the known positions and received signal strength at the detecting receivers. Conversion factors that increase with signal strength magnify its influence, so strong signals dominate the locating calculations. In addition to a calculated location of the transmitting communicator, the alarm center displays the location of a plurality of the detecting receivers, selecting between alternative displayed information depending on a comparison of the received signal strengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.