Locating system, device and method
First Claim
1. A child locating system comprising a child locating device, and a further device carried or worn by a child, the further device comprising transmission means for transmitting an electromagnetic signal towards said child locating device, said child locating device comprising:
- at least three spaced antennas for receiving said electromagnetic signal;
switching means for switching the at least three antennas in such a way as to obtain a Dopplescant effect;
processing means for processing the electromagnetic signal as received by the antennas; and
outputting means for producing an output indicative of the direction of the further device with respect to said child locating device.
2 Assignments
0 Petitions
Accused Products
Abstract
A locating system is disclosed, which can be used for locating a child. The system comprises a child locating device (parent unit) and a further device (child unit) carried or worn by the child. The child unit transmits an electromagnetic signal towards the parent unit, and the parent unit receives the electromagnetic signal, using at least three spaced antennas which are switched in such a way as to obtain a Dopplescant effect. The received signal is processed and the direction of the child unit with respect to the parent unit is displayed on a display on the parent unit. Distance measurement is also possible. The system can be used with several child units.
21 Citations
48 Claims
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1. A child locating system comprising a child locating device, and a further device carried or worn by a child, the further device comprising transmission means for transmitting an electromagnetic signal towards said child locating device,
said child locating device comprising: -
at least three spaced antennas for receiving said electromagnetic signal;
switching means for switching the at least three antennas in such a way as to obtain a Dopplescant effect;
processing means for processing the electromagnetic signal as received by the antennas; and
outputting means for producing an output indicative of the direction of the further device with respect to said child locating device.
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2-12. -12. (canceled)
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13. A locating device for use in a locating system comprising said locating device and a further device, the further device comprising transmission means for transmitting an electromagnetic signal towards said locating device, the electromagnetic signal having a signature associated with the further device;
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said locating device comprising;
signature storage means for storing a representation of the signature of the further device;
at least three spaced antennas for receiving said electromagnetic signal;
switching means for switching the at least three antennas in such a way as to obtain a Dopplescant effect;
processing means for processing the electromagnetic signal as received by the antennas so as to detect the signature of the received signal, and to compare the signature as detected with the representation of the signature as stored;
and outputting means for producing, if the signature as detected corresponds to the representation of the signature as stored, an output indicative of the direction of the further device with respect to said locating device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. (canceled)
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31. A method of determining, using a locating device, information indicative of the direction of a further device with respect to said locating device, the method comprising:
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storing a representation of a signature associated with the further device in said locating device;
transmitting an electromagnetic signal from the further device towards said locating device, the electromagnetic signal including the signature associated with the further device;
receiving said electromagnetic signal at said locating device, using at least three spaced antennas which are switched in such a way as to obtain a Dopplescant effect;
processing the electromagnetic signal as received by the antennas so as to detect the signature of the received signal;
comparing the signature as detected with the representation of the signature as stored; and
if the signature as detected corresponds to the representation of the signature as stored, producing an output indicative of the direction of the further device with respect to said locating device. - View Dependent Claims (48)
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32-47. -47. (canceled)
Specification