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Mobile communication apparatus and position detection method thereof

  • US 20020175854A1
  • Filed: 04/19/2002
  • Published: 11/28/2002
  • Est. Priority Date: 04/20/2001
  • Status: Active Grant
First Claim
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1. A mobile communication apparatus comprising:

  • a base station distance and position measurement part which measures first propagation distances of radio waves coming from base stations and measures a first present position of the mobile communication apparatus from the first propagation distances;

    a GPS distance and position measurement part which measures second propagation distances of radio waves coming from GPS satellites and measures a second present position of the mobile communication apparatus from second propagation distances; and

    a position measurement accuracy analysis part which decides one of the first present position and the second present position to be a true present position of the mobile communication apparatus, wherein the base station distance and position measurement part decides a first position measurement error of the first present position;

    the position measurement accuracy analysis part compares the first position measurement error of the first present position with a first predetermined criterion; and

    when the position measurement accuracy analysis part decides that the position measurement error exceeds the first predetermined criterion, the GPS distance and position measurement part measures the second propagation distances and the second present position; and

    the position measurement accuracy analysis part decides that the second present position is adopted as the true present position of the mobile communication apparatus.

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