System and method for determining the geographic location of a device
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United States of America Patent
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Oct 25, 2011
Grant Date -
Jul 9, 2009
app pub date -
Jan 3, 2008
filing date -
Jan 3, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for estimating a location of a device. For each of a plurality of locations of a device, a set of positional data is determined from signals received from a plurality of satellites. The positional data is filtered and compared with data from a road network database. This comparison may be a function of a distance from at least one point defined by a set of the filtered positional data to a road in the road network database and an angle between a line representing a best fit for plural points defined by corresponding plural sets of the filtered positional data to a line defined by a road in the road network database.
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