Radio positioning systems
US7508883B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2003 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Aug 8, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0218
- 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 a blurred estimate of that brightest signal is subtracted from a blurred version of 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.