Global Patent Index - EP 1240531 A1

EP 1240531 A1 2002-09-18 - A RECEIVER FOR A SATELLITE BASED POSITION LOCATION SYSTEM

Title (en)

A RECEIVER FOR A SATELLITE BASED POSITION LOCATION SYSTEM

Title (de)

EMPFÄNGER FÜR EIN SATELLITENGESTÜTZTES ORTUNGSSYSTEM

Title (fr)

RECEPTEUR POUR SYSTEME SATELLITAIRE DE DETERMINATION DE POSITIONS

Publication

EP 1240531 A1 (EN)

Application

EP 00985504 A

Priority

  • GB 0004706 W
  • GB 9929327 A
  • GB 0016246 A

Abstract (en)

[origin: WO0142811A1] The present invention provides a method for determining synchronisation of a signal received in a global positioning system receiver and transmitted by a global positioning system satellite, wherein the method comprises the steps of transform coding (14) said received signal so as to transform said received signal from time domain to frequency domain coefficients, dividing respective (18) ones of said frequency domain coefficients by corresponding ones of transform coefficients of the expected transmitted signal associated with said satellite to provide corresponding transform value ratios, and deriving (20, 22) from respective transform value ratios corresponding scaled values of the time delay of the signal between the satellite and the receiver. The invention directs the search for synchronisation to a small set of chips thereby providing an indication of the identity of the synchronisation sequence. Thus the search for the synchronisation chip is more focused than the prior art method, which results in obtaining synchronisation on average more quickly and more efficiently than in the prior art.

IPC 1-7 (main, further and additional classification)

G01S 1/04; G01S 5/14

IPC 8 full level (invention and additional information)

G01S 1/00 (2006.01); G01S 11/06 (2006.01); G01S 19/24 (2010.01); H04B 7/185 (2006.01); H04B 7/26 (2006.01)

CPC (invention and additional information)

G01S 11/06 (2013.01); G01S 19/24 (2013.01)

Citation (search report)

See references of WO 0142811A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

WO 0142811 A1 20010614; AU 2192001 A 20010618; EP 1240531 A1 20020918; JP 2003516547 A 20030513

INPADOC legal status


2005-07-27 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20050610

2002-09-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020710

2002-09-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-09-18 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI