METHOD AND SYSTEM FOR FINDING THE POSITION FOR STATE OF MOTION OF A TERMINAL IN A COMMUNICATIONS NETWORK AND COMPUTING DEVICE OR DEVICES OF OR USE IN SUCH NETWORK
Application 1253/DELNP/2005 published 2007-01-19, filed 2005-03-31
The present invention sets out to overcome the hearabilily problem in CDMA communications network 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 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.
Applicant
1)CAMBRIDGE POSITIONING SYSTEMS LIMITED
:62-64 HILLS ROAD, CAMBRIDGE CB2 1LA, UK U.K.
Inventor
1)DUFFETT-SMITH, PETER JAMES 2)MACNAUGHTAN, MALCOLM DAVID 3)CLARKE, JOHN CHRISTOPHER 4)ROWE, ROBERT WILLEM
International Info
Classification: G01S
Publication Number: WO 03/008990
Application Date: 2002-07-15
Priority Information
01306115.5 EUROPEAN UNION 2001-06-17