Positioning and time transfer using television synchronization signals
US8233091B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2008 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Mar 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0352
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods having corresponding apparatus and computer-readable media comprise: receiving television signals and a message at an apparatus, wherein the television signals include an NTSC television signal and an ATSC television signal, wherein the message represents first and second arrival times representing absolute times of arrival at the apparatus of a first wavefront of the NTSC and ATSC television signals, respectively; measuring third and fourth arrival times, based on a local clock, after receiving the message, wherein the third and fourth arrival times represent times of arrival at the apparatus of a second wavefront of the NTSC and ATSC television signals, respectively; and providing a clock correction signal for the local clock based on the first arrival time, the second arrival time, the third arrival time, and the fourth arrival time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.