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System and method for determining the geographic location of a device

  • US 8,046,169 B2
  • Filed: 01/03/2008
  • Issued: 10/25/2011
  • Est. Priority Date: 01/03/2008
  • Status: Expired due to Fees
First Claim
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1. A method of estimating a location of a device, comprising:

  • (a) determining for each of a plurality of locations of said device a set of positional data from signals received from a plurality of sources;

    (b) filtering said positional data, comprising the steps of;

    (i) detecting a jump between consecutive positional data if the speed between the consecutive positional data exceeds a predetermined threshold; and

    (ii) correcting the jump with a processor as a function of the angle and the speed between the consecutive positional data,wherein the step of correcting the jump comprises correcting the jump as a function of the following vector relationship;


    vectorT={s1+[(s2

    s
    1)/(N−

    1)]*T}*[cos(θ

    1+((θ

    2

    θ

    1)/(N−

    1))*T)]*x+{s1+[(s2

    s
    1)/(N−

    1)]*T}*[sin(θ

    1+((θ

    2

    θ

    1)/(N−

    1))*T)]*y; and

    (c) comparing said filtered positional data with data from a road network database wherein said comparing is a function of;

    (i) a distance from at least one point defined by a set of said filtered positional data to a road in said road network database, and(ii) an angle between a line representing a best fit for plural points defined by corresponding plural sets of said filtered positional data to a line defined by a road in said road network database.

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