Radio positioning systems
US6894644B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2002 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Jul 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/017
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention sets out to overcome the hearability problem in CDMA communications networks in which positioning services are provided, by using a separate sampling device (204, 205, 206) for each transmitter (201, 202, 203), which sends to the computing device (208) a representation of the signals transmitted only by that transmitter. A cross-correlation of the representation sent back by the mobile terminal (207) with the representation sent back by the sampling device in the brightest transmitter is performed in the computing device (208), and an estimate of that brightest signal is subtracted from the representation sent back by the mobile terminal (207) in order to reduce its effect on the remaining signals as far as possible. The cross-correlation and subtraction steps are iterated until no useful signals remain to be extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.