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US Patent 7969820 Mobile object communication and position determination

Patent 7969820 was granted and assigned to Sonitor on June, 2011 by the United States Patent and Trademark Office.

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Patent 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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