Global Patent Index - EP 1257841 A2

EP 1257841 A2 2002-11-20 - LOCATING A MOBILE UNIT USING COHERENTLY PROCESSED SATELLITE SIGNALS COMBINED WITH SIGNALS FROM STATIONARY BEACONS

Title (en)

LOCATING A MOBILE UNIT USING COHERENTLY PROCESSED SATELLITE SIGNALS COMBINED WITH SIGNALS FROM STATIONARY BEACONS

Title (de)

FINDEN EINER MOBILEINHEIT UNTER VERWENDUNG KOHÄRENT VERARBEITETER SATELLITENSIGNALE IN KOMBINATION MIT SIGNALEN VON STATIONÄREN BAKEN

Title (fr)

LOCALISATION D'UNE UNITE MOBILE AU MOYEN DE SIGNAUX SATELLITE TRAITES DE MANIERE COHERENTE ASSOCIES A DES SIGNAUX DE BALISES STATIONNAIRES

Publication

EP 1257841 A2 (EN)

Application

EP 00984480 A

Priority

  • US 0034306 W
  • US 17628900 P
  • US 58561900 A
  • US 58562200 A

Abstract (en)

[origin: WO0153848A2] A method and system for finding the position of a mobile unit (10) with respect to the satellites (70) of a satellite network such as the Global Positioning System and with respect to the base stations (Figure 2) of a wireless communications network. Each satellite transmits a signal that consists of a series of frames of a pseudonoise sequence. The frames of a signal received from the satellite network by the mobile unit are arranged as columns of a matrix and are processed coherently to provide estimated pseudoranges and estimated rates of change of pseudoranges for in view satellites. The coherent processing includes performing an orthogonal transform on the rows of the matrix, multiplying the elements of the matrix by Doppler compensation factors, and then, for each satellite in view, convolving the columns of the matrix with the pseudonoise sequence of that satellite.

[origin: WO0153848A2] A method and system for finding the position of a mobile unit with respect to the satellites of a satellite network such as the Global Positioning System and with respect to the base stations of a wireless communications network. Each satellite transmits a signal that consists of a series of frames of a pseudonoise sequence. The frames of a signal received from the satellite network by the mobile unit are arranged as columns of a matrix and are processed coherently to provide estimated pseudoranges and estimated rates of change of pseudoranges for in view satellites. The coherent processing includes performing an orthogonal transform on the rows of the matrix, multiplying the elements of the matrix by Doppler compensation factors, and then, for each satellite in view, convolving the columns of the matrix with the pseudonoise sequence of that satellite. Other pseudoranges are inferred from synchronization burst sequences received by the mobile unit from one or more base stations. If the base stations are not mutually synchronized, reference units are provided to determine the time offsets between the base station clocks and the satellite network clock and to transmit these time offsets to the mobile unit, so that all the pseudoranges include the same bias relative to the satellite network clock. The pseudoranges are processed and reconciled by a dynamic estimator that includes a linear optimal estimator such as a Kalman filter, to produce successive estimates of the location of the mobile unit as the mobile unit moves.

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

G01S 1/00

IPC 8 full level (invention and additional information)

G01S 1/68 (2006.01); G01S 19/12 (2010.01); G01S 19/25 (2010.01); G01S 19/29 (2010.01); H04Q 7/34 (2006.01)

CPC (invention and additional information)

G01S 19/29 (2013.01); G01S 19/12 (2013.01); G01S 19/252 (2013.01); G01S 19/256 (2013.01)

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 0153848 A2 20010726; WO 0153848 A3 20020502; AU 2109201 A 20010731; CN 1425226 A 20030618; EP 1257841 A2 20021120; EP 1257841 A4 20090513; IL 150417 D0 20021201; JP 2003520968 A 20030708

INPADOC legal status


2014-12-03 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20140701

2010-05-26 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20100426

2009-05-13 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20090415

2009-05-13 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: G01S 5/02 20060101AFI20090407BHEP

2002-12-04 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7H 04B 7/185 A, 7G 01S 5/02 B

2002-11-20 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020719

2002-11-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

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

2002-11-20 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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