SYSTEM AND METHOD FOR POSITION DETERMINATION OF OBJECTS
First Claim
1. A method comprising the steps of:
- transmitting from a transmitter unit an FSK-encoded acoustic signal comprising an identification code;
receiving the signal in a receiver unit; and
performing a pattern comparison of the received signal to determine a signature that is characterizing for time and Doppler shift.
2 Assignments
0 Petitions
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
41 Claims
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1. A method comprising the steps of:
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transmitting from a transmitter unit an FSK-encoded acoustic signal comprising an identification code;
receiving the signal in a receiver unit; and
performing a pattern comparison of the received signal to determine a signature that is characterizing for time and Doppler shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system comprising:
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a transmitter unit arranged to transmit an FSK-encoded acoustic signal comprising an identification code; and
a receiver unit arranged to perform a pattern comparison of a received signal to determine a signature that is characterizing for time and Doppler shift. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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- 19. A receiver comprising logic adapted to perform a pattern comparison of a received FSK-encoded acoustic signal to determine a signature that is characterizing for time and Doppler shift.
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27. 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 with that received by the second detector; and
determining from said comparison an estimate of the position of the transmitter unit.
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28. 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 from said received signal. - View Dependent Claims (29)
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30. A method of determining the position of a transmitter unit in a room comprising the step of:
transmitting from the transmitter unit an FSK-encoded acoustic signal comprising at least one chirped tone. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
Specification