WIRELESS POSITION SENSING USING MAGNETIC FIELD OF TWO TRANSMITTERS
First Claim
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1. A positioning system, comprising:
- a) two transmitting coils, each coil configured to transmit a periodic signal with a respective selected frequency during a positioning event, wherein the frequencies of the two signals transmitted by the two transmitting coils during the positioning event are different;
b) a receiver including a sensing unit for measuring the magnetic field vectors produced by the two simultaneously transmitting coils; and
c) a computing unit configured to use the measured magnetic field vectors to calculate the position and orientation of the receiver with respect to the transmitter'"'"'s coordinate frame.
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Abstract
A positioning system for determining the location of a receiver relative to a transmitter. The system includes two transmitting coils configured to transmit a periodic signal with a respective selected frequency during a positioning event, wherein the frequencies of the two signals transmitted by the two transmitting coils during the positioning event are different. A receiver includes a sensing unit for measuring the magnetic field vectors produced by the two simultaneously transmitting coils. A computing unit is configured to use the measured magnetic field vectors to calculate the position and orientation of the receiver with respect to the transmitter'"'"'s coordinate frame.
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Citations
20 Claims
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1. A positioning system, comprising:
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a) two transmitting coils, each coil configured to transmit a periodic signal with a respective selected frequency during a positioning event, wherein the frequencies of the two signals transmitted by the two transmitting coils during the positioning event are different; b) a receiver including a sensing unit for measuring the magnetic field vectors produced by the two simultaneously transmitting coils; and c) a computing unit configured to use the measured magnetic field vectors to calculate the position and orientation of the receiver with respect to the transmitter'"'"'s coordinate frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of determining a position of a receiver in relation to a pair of transmitting coils, comprising:
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simultaneously transmitting a pair of periodic signals during a positioning event using the pair of transmitting coils, the periodic signals having different frequencies; using a receiver, sensing a magnetic field vector produced by the transmitting coils; using a computing device, estimating a position and orientation of the receiver with respect to the transmitter coils'"'"' coordinate system using the measured magnetic field vector from the two transmitter coils.
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Specification