Ultrasonic in-building positioning system based on phase difference array with ranging
AssigneeIntelligent Sciences, Ltd.
InventorsJacques Y. Guigne, James A. Stacey, Nicholas G. Pace
Life of this patent
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Abstract
A method for determining position of a mobile electronic device includes emitting an acoustic pulse from the position of the mobile electronic device. The acoustic pulse is detected at a known position at three spaced apart locations along each of at least two lines extending in different directions. The range and phase difference of the acoustic pulse between each of the detecting locations is determined. A relative position of the device with respect to the known position is obtained from the range and phase differences.
Claims12
A method for determining position of a mobile electronic device within a building, comprising:
- emitting, in the building at least one of an electromagnetic and an optical initiation signal from the mobile electronic device;
- identifying the mobile device by detecting the initiation signal at a base station disposed in the building;
- transmitting a control signal from the base station to cause emitting an acoustic pulse from the position of the mobile electronic device;
- detecting the acoustic pulse at the base station at at least three known spaced apart locations along each of at least two lines extending in different directions;
- determining the time differences of arrival of acoustic pulses at each of the detecting locations;
- determining a phase difference of the acoustic pulse between each of the detecting locations;
- determining a relative position of the device with respect to the base station known position from the time differences of arrival and phase differences;
- and
- at least one of storing or displaying the relative position.
Dependencies are inferred from the claim text.