Method and system for calibrating wireless location systems
US6795019B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0273
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a method for calibrating a wireless location system (WLS) to enable the system to make highly accurate differential measurements such as time difference of arrival (TDOA) and frequency difference of arrival (FDOA). Calibration is accomplished by transmitting a signal from an unknown location and measuring at each of two receivers the parameter to be calibrated from that part of the received signal reflected or refracted from an object at a known location in the area. A differential measurement error is determined by comparing the expected difference in the parameter measurements with the actual difference in the parameter measurements. The expected difference is known, a priori, based on the locations of the receivers and the location of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.