System and method for performing time difference of arrival location without requiring a common time base or clock calibration
US7609207B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 2008 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Dec 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a packet transmitted from a reference wireless device (first wireless device) with a known propagation delay between the first wireless device and a second device, which serves as a common reference point for all TDOA estimates. When a packet is received from a wireless device by the first wireless device and the second wireless device, the time difference of arrival is computed based on when the signal was received by the first device and the second device, using the known propagation delay to compensate for differences in clocks and frequencies between the first wireless device and the second wireless device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.