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System and/or method for providing information updates to a location server

  • US 8,971,797 B2
  • Filed: 08/01/2007
  • Issued: 03/03/2015
  • Est. Priority Date: 08/01/2006
  • Status: Active Grant
First Claim
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1. A method comprising:

  • obtaining, at a mobile device, a first raw pseudorange measurement based, at least in part, on a signal received at said mobile device from a first transmitter;

    updating the first raw pseudorange measurement to obtain a first estimated pseudorange at a first instance of time;

    obtaining, at the mobile device, a second raw pseudorange measurement based, at least in part, on a signal received at said mobile device;

    updating the second raw pseudorange measurement to obtain a second estimated pseudorange at a second instance of time;

    extrapolating one or more of the first and second estimated pseudoranges to obtain an extrapolated estimated pseudorange at a future instance of time based on an estimated rate of change of the first or second estimated pseudorange, comprising weighting said first estimated pseudorange and said second estimated pseudorange according to perceived presence of multipath when the first and second estimated pseudoranges are obtained at the first and second instances of time, respectively, wherein one of the first and second estimated pseudoranges obtained in a perceived low multipath environment is weighted more than the other one of the first and second estimated pseudoranges obtained in a perceived high multipath environment; and

    transmitting the extrapolated estimated pseudorange from said mobile device to a location server.

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