Distance/ranging determination using relative phase data
US7580378B2 · kind B2 · utility
76Cited by
14References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2005 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Mar 6, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for locating an RF transponder based on phase differences between signals received from the RF transponder. The method includes receiving a signal from the transponder and calculating distance, relative movement, and position by comparing I-Q phase angle vectors of the signals. Global scroll commands can be used following receipt of signals at first and second frequencies to quickly determine distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.