Radio-controlled method and device for measuring time
US7660369B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2007 |
| Grant date | Feb 9, 2010 |
| Priority date | — |
| Expiry date | Aug 9, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a radio-controlled device for measuring time, a demodulating unit demodulates the time information from the received electric signal based on amplitude information of the target radio wave. The amplitude information is obtained from in-phase and quadrature-phase components of the target radio wave. A phase calculator calculates phase data associated with a phase of the target radio wave based on the in-phase and quadrature-phase components. A variability calculator calculates a variability of the phase data of the target radio wave relative to a reference phase. The reference phase changes at a constant rate in time according to a frequency error. The frequency error is contained in the reference signal relative to a frequency of the target carrier wave. A reception determining unit determines whether reception of the radio-controlled device is good based on the calculated variability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.