Mobile object communication and position determination
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United States of America Patent
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Jun 28, 2011
Grant Date -
Oct 23, 2008
app pub date -
Apr 22, 2008
filing date -
Apr 23, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
An ultrasound position determination system includes a base unit and at least one mobile unit. Each of the mobile and base units are operable to transmit and receive ultrasonic signals. The mobile unit is adapted to transmit a predetermined signal in dependence upon the state of transmission of the base unit. The base unit is adapted to determine the time taken for the signal to pass from the mobile unit to the base unit and thereby calculate a distance between the mobile unit and the base unit.
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