Local positioning systems and methods
US8274396B2 · kind B2 · utility
26Cited by
4References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2009 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Sep 24, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2205/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A local positioning system uses at least one node to track a location of a mobile tag. The system measures flight times of signals communicated between the node and the tag to determine values indicative of the range of the tag from the node. If desired, the values may be filtered in an effort to increase the accuracy of the range estimation. As an example, a Kalman filtering algorithm may be used. Multiple antennas are used at both the node and the tag to provide more accurate range estimates and to determine when the tag is entering a dead zone where signals are blocked or attenuated by obstacles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.