Monitoring location and tracking system
US6472976B1 · kind B1 · utility
Inventor
Key dates
| Filing date | May 21, 1999 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | May 21, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/009
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The location systems are made up of a monitoring and control center, repeaters and tags.System communications are preferably at frequencies in the 900 MHz band. The center and computers utilize both commercial and custom software developed for use in and by the system. The center, repeaters and tags can also include a sensor(s) and a panic “switch” and/or other informational input mechanism(s). The coordinates of the repeaters and control station transmitters are stored in tag memory. The location of the tag(s) in time and space is by use of the stored coordinates in memory and by calculations based on time phase measurements of transmissions from the control center an/or the repeaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.