US 2002/0175854 A1Published application

Mobile communication apparatus and position detection method thereof

AssigneePioneer Corporation

InventorsTakehiko Shioda, Manabu Nohara

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Abstract

When position measurement accuracy of the present position which the base station distance and position measurement part measures from radio waves coming from base stations is not good, a GPS distance and position measurement part measures the present position from radio waves coming from GPS satellites. When position measurement accuracy of the present position obtained by the GPS distance and position measurement part is not good, a position measurement accuracy analysis part compounds the present position obtained by the base station distance and position measurement part with the present position obtained by the GPS distance and position measurement part, and calculates a new position within a range of overlap between a position measurement error of the present position obtained by the base station distance and position measurement part and a position measurement error of the present position obtained by the GPS distance and position measurement part.

Claims12

Dependent claims

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.

7 more elements

Dependencies are inferred from the claim text.