Method for localizing an object
First Claim
1. A method to localize an object, comprising:
- transmitting by a first transmitter assigned to the object a first signal from a first frame;
transmitting by at least one second transmitter a second signal from a second frame, wherein said first and second frames include a common portion;
receiving the first signal and the second signal by at least three receivers, each receiver performing, for the first signal and the second signal, acts of;
generating a first reference signal from a third frame and a second reference signal from a fourth frame, the third and fourth frames including said common portion;
performing a first correlation between the first signal and the first reference signal;
performing a second correlation between the second signal and the second reference signal;
interpolating samples resulting from the first and second correlations;
deducing propagation time of the first signal and propagation time of the second signal; and
calculating a difference between the propagation times of the first signal and of the second signal; and
deducing a position of the object by triangulation based on the differences between the propagation times of the first signal and the second signal.
1 Assignment
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Accused Products
Abstract
A method for localizing an object, including the acts of: transmission of a first signal by a first transmitter assigned to the object and of a second signal by at least one second transmitter; reception of the first and of the second signal by at least three receivers; in each receiver and for the first and the second signal: a) generation of a first and of a second reference signal; b) correlation between the first signal and the first reference signal and between the second signal and the second reference signal; c) interpolation of samples resulting from the correlation; d) deduction of the propagation time of the first and of the second signal; e) calculation of the difference between the propagation times of the first and of the second signal; and, by triangulation, deduction of the position of the object.
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Citations
27 Claims
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1. A method to localize an object, comprising:
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transmitting by a first transmitter assigned to the object a first signal from a first frame; transmitting by at least one second transmitter a second signal from a second frame, wherein said first and second frames include a common portion; receiving the first signal and the second signal by at least three receivers, each receiver performing, for the first signal and the second signal, acts of; generating a first reference signal from a third frame and a second reference signal from a fourth frame, the third and fourth frames including said common portion; performing a first correlation between the first signal and the first reference signal; performing a second correlation between the second signal and the second reference signal; interpolating samples resulting from the first and second correlations; deducing propagation time of the first signal and propagation time of the second signal; and calculating a difference between the propagation times of the first signal and of the second signal; and deducing a position of the object by triangulation based on the differences between the propagation times of the first signal and the second signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system to localize an object, comprising:
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a first transmitter assigned to the object and configured to transmit a first signal from a first frame; at least one second transmitter capable of transmitting a second signal from a second frame, wherein said first and second frames include a common portion; at least three receivers, each receiver configured to receive the first and the second signal, each receiver comprising; a first element configured to generate a first reference signal from a third frame and a second reference signal from a fourth frame, the third and fourth frames including said common portion; a second element configured to calculate a first correlation between the first signal and the first reference signal, the second element configured to calculate a second correlation between the second signal and the second reference signal; a third element configured to calculate an interpolation of samples resulting from the first correlation and an interpolation of samples resulting from the second correlation, the third element configured to deduce propagation time of the first signal and propagation time of the second signal; and a fourth element configured to calculate a difference between the propagation times of the first signal and of the second signal; and a calculation unit configured to receive from each receiver the difference between the propagation times of the first signal and of the second signal, the calculation unit configured to deduce a position of the object by triangulation based on the differences between the propagation times of the first signal and of the second signal calculated by each receiver. - View Dependent Claims (8, 9)
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10. A receiver to localize an object, comprising:
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a demodulator arranged to pass a first signal from a first transmitter, the first transmitter associated with an object, the demodulator arranged to pass a second signal from a second transmitter, the first signal and the second signal having a common portion; a first module configured to generate a first reference signal and a second reference signal, the first reference signal and the second reference signal having a common reference portion a second module configured to calculate a first correlation between the first signal and the first reference signal, the second module configured to calculate a second correlation between the second signal and the second reference signal; a third module configured to calculate an interpolation of first correlation samples and second correlation samples passed from the second module; a fourth module configured to deduce propagation time of the first signal and propagation time of the second signal based on the interpolation from the third module; a fifth module configured to calculate a difference between the propagation time of the first signal and the propagation time of the second signal; and a calculation module configured to; receive the difference between the propagation time of the first signal and the propagation time of the second signal; receive a second difference between the propagation time of the first signal and the propagation time of the second signal generated by a second receiver; receive a third difference between the propagation time of the first signal and the propagation time of the second signal generated by a third receiver; and deduce a position of the object by triangulation based on the difference, the second difference, and the third difference. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method to localize an object, comprising:
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receiving a first signal and a second signal by at least three receivers, the first and second signals having a common portion, each receiver performing, for the first signal and the second signal, acts of; generating a first reference signal from one frame and a second reference signal from another frame, the two frames including said common portion; performing a first correlation between the first signal and the first reference signal; performing a second correlation between the second signal and the second reference signal; interpolating samples from the first and second correlations; deducing propagation time of the first signal and propagation time of the second signal; and calculating a difference between propagation times of the first signal and of the second signal; and deducing a position of the object based on the differences between the propagation times of the first signal and the second signal. - View Dependent Claims (22, 23, 24)
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25. A receiver to localize an object, comprising:
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a demodulator arranged to pass a first signal and a second signal, the first signal and the second signal having a common portion; a first module configured to generate a first reference signal and a second reference signal, the first reference signal and the second reference signal having a common reference portion; a second module configured to calculate a first correlation between the first signal and the first reference signal, the second module configured to calculate a second correlation between the second signal and the second reference signal; a third module configured to calculate an interpolation of first correlation samples and second correlation samples passed from the second module; a fourth module configured to deduce propagation time of the first signal and propagation time of the second signal based on the interpolation from the third module; and a calculation module configured to deduce a position of the object based on a difference between propagation times of the first and second signals calculated by the receiver and by at least two other receivers. - View Dependent Claims (26, 27)
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Specification