System and method for position determination of objects
First Claim
1. A method of determining the position of a transmitter unit comprising the steps of:
- transmitting from the transmitter unit an FSK-encoded acoustic signal;
receiving said signal at a first detector unit;
receiving said signal at a second detector unit connected to the first detector unit by a network;
comparing the signal strength received by the first detector unit with that received by the second detector unit; and
determining from said comparison an estimate of the position of the transmitter unit.
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Accused Products
Abstract
A method and a system for detection and position determination of chips, which transmit ultrasound signals in a room. The system comprises electronic identification chips, which are attached to objects that have to be monitored. Each chip is equipped with a transmitter and a receiver. The signals are received by a plurality of detector units, which are connected to a detector base unit that registers and interprets the signals transmitted form the identification chips. Detector base units located in different rooms are interconnected in a network and transmit processed information to one or more central units for further interpretation and sorting. The special feature of the invention is that line interference is substantially removed, and it is possible to determine position even though the identification chips are in motion.
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Citations
12 Claims
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1. A method of determining the position of a transmitter unit comprising the steps of:
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transmitting from the transmitter unit an FSK-encoded acoustic signal; receiving said signal at a first detector unit; receiving said signal at a second detector unit connected to the first detector unit by a network; comparing the signal strength received by the first detector unit with that received by the second detector unit; and determining from said comparison an estimate of the position of the transmitter unit. - View Dependent Claims (2, 3, 4)
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5. A method of determining the position of a transmitter in a room comprising the steps of:
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transmitting from the transmitter ultrasound signals with different frequencies; receiving the signals at a first receiver in the room; receiving the signals at a second receiver in the room; comparing received signal strengths from the first and second receivers; and determining from said comparison an estimate of the position of the transmitter in the room. - View Dependent Claims (6, 7)
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8. A system for determining the position of a transmitter unit comprising:
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a transmitter unit arranged to transmit an FSK-encoded acoustic signal; a first detector unit arranged to receive said signal; a second detector unit arranged to receive said signal; a network connecting said first detector unit with said second detector unit; and a central unit in network communication with said first and second detector units and arranged to compare the signal strength received by the first detector unit with that received by the second detector unit, and to determine from said comparison an estimate of the position of the transmitter unit.
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9. A system for determining the position of a transmitter in a room comprising:
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a transmitter with an ultrasound transducer for transmitting signals on several different base frequencies; a first receiver in the room arranged to receive signals from the transmitter; a second receiver in the room arranged to receive signals from the transmitter; and a central unit in communication with said first and second receivers and arranged to compare received signal strengths from the first and second receivers, and to determine from said comparison an estimate of the position of the transmitter in the room.
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10. A central control unit for a position-determining system arranged to:
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receive first data relating to ultrasound signals transmitted by a transmitter unit and received by a first receiver unit located in a room; receive second data relating to said ultrasound signals received by a second receiver unit located in said room; and process said first and second data to compare received signal strengths and to determine from said comparison an estimate of the position of the transmitter unit in the room.
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11. A method of determining the location of an acoustic transmitter unit in an environment containing line noise comprising the steps of:
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measuring and evaluating line noise with a line noise detector; receiving an acoustic signal from the transmitter unit; selectively filtering unwanted signals detected by the line noise detector; and determining the location of the acoustic transmitter unit from said received signal. - View Dependent Claims (12)
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Specification