Asset and personnel tagging system utilizing GPS
US6700533B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2000 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | May 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2205/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for tracking objects outdoors. Tags attached to objects such as trailers include GPS receivers. Tags transmit uncorrected position and satellite data to a base station, where differential corrections are applied, providing 2-5 meter accuracy of the position of the tag and object. Tags are on a low duty cycle. When a tag powers on, it receives accurate time and current satellite data from the base station, enabling the tags to acquire the satellite signal quickly and with minimum power consumption. When a tag is out of base station range, the tag periodically calculates and archives its position. The tag may also include Real Time Locating Systems technology, to enable tracking to continue when the tag moves indoors and becomes inaccessible to GPS satellite signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.