Method and system for processing positioning signals based on predetermined message data segment

• US 8,102,312 B2
• Filed: 12/14/2009
• Issued: 01/24/2012
• Est. Priority Date: 07/18/2001
• Status: Active Grant

• Current Assignee: Fast Location.Net, LLC
• Original Assignee: Fast Location.Net, LLC
• Inventors: Bromley, Patrick G., Jandrell, Louis H. M., Wise, Michael D.
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Nguyen, Nga X
• Application Number:
  US12/637,466
• Publication Number:
  US 20100090894A1
• Time in Patent Office: 771 Days
• Field of Search: 3423572-35778, 375/143, 375/150, 375/152
• US Class Current: 342/357.77
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/17 Emergency applications
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/254 relating to Doppler shift of satellite signals
• CPC Class Codes: G01S 19/256 relating to timing, e.g. time of week, code phase, timing offset
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 19/35 Constructional details or hardware or software details of the signal processing chain
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0018 Transmission from mobile station to base station
• CPC Class Codes: G01S 5/0063 of measured values, i.e. measurement on base station and position calculation on mobile

Abstract

A method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment. A time of arrival of the predetermined message data segment may be determined in the positioning signal. Information based on the time of arrival may be provided for determination of a geolocation of an object. The time of arrival of the predetermined message data segment may be determined based on a time search for the predetermined message data segment in the positioning signal.

Claims

1. A method for processing positioning signals, comprising:

collecting, by a processor, a positioning signal sample including multi-bit epoch sequences from an object;

determining, by the processor, an epoch of the signal sample that is most likely to correspond to a first epoch of a predetermined message data segment in the signal sample;

selecting, by the processor, a segment of the signal sample that follows the first epoch and is equal in length to a length of the predetermined message data segment;

aligning, by the processor, the selected segment of the signal sample with a replica of the predetermined message data segment;

multiplying, by the processor, each signal sample value of the selected segment of the signal sample by a modulation sign of a corresponding epoch of the replica of the predetermined message data segment;

integrating, by the processor, the multi-bit epoch sequences to generate an integration sum; and

generating, by the processor, a time sequence for geolocation determination of the object through correlation of the integration sum.

2. The method of claim 1, the width of the integration sum being one epoch wide.