Method of factorizing pseudodistance time of week in an assisted GNSS context

• US 7,312,748 B2
• Filed: 01/27/2005
• Issued: 12/25/2007
• Est. Priority Date: 01/28/2004
• Status: Expired due to Fees

• Current Assignee: Sound View Innovations, LLC (Sound View Innovation Holdings, LLC)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Monnerat, Michel
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): Mull, Fred H.
• Application Number:
  US11/043,183
• Publication Number:
  US 20050174285A1
• Time in Patent Office: 1,062 Days
• Field of Search: 342/357.09, 342/357.1
• US Class Current: 342/357.46
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/252 Employing an initial estimate of location in generating assistance data

Abstract

A method is disclosed of calculating the position of a mobile device in which an assistance data server provides aid with solving the point of the mobile device and the mobile device communicates with the server via a cellular network and receives positioning signals from a satellite positioning system using a spread spectrum access technique. The method comprises the following steps: following reception of the positioning signals, the device sends the server a set of spreading code phases corresponding to the satellites acquired, the code phases having a single time of week indication corresponding to the transmission time of one of the code phases; the server deduces from the information the transmission times corresponding to the code phases and the pseudodistances; and the server solves the point.

Claims

1. A method of calculating a position of a mobile device, said method employing an assistance data server for providing aid with solving the position of said mobile device and said mobile device comprising means for communicating with the server via a cellular mobile telephone network and means for receiving positioning signals from a satellite positioning system using a spread spectrum access technique, said method comprising:

following reception of said positioning signals, sending from the mobile device to said server a set of spreading code phases corresponding to the satellites acquired, said set of spreading code phases having a single time of week indication corresponding to the transmission time of one of the code phases,

determining, from said code phases, transmission times corresponding to said code phases and pseudodistances at said server, and

determining said position at said server.