Background object sensor
First Claim
1. A system, comprising:
- an RFID transmitter positioned about one side of a portal, wherein the RFID transmitter is configured to transmit a first radio frequency signal and a second radio frequency signal in a monitored region;
an RFID receiver positioned about another side of the portal, wherein the RFID receiver is configured to receive the first radio frequency signal and the second radio frequency signal, the first radio frequency signal reflecting off of a surface of an object to be monitored and the second radio frequency signal not reflecting off of the surface of the object to be monitored;
a comparator configured to compare the first radio frequency signal with the second radio frequency signal to provide a signal comparison; and
a processor configured to determine, based on the signal comparison, whether the object to be monitored has been positioned in the monitored region.
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Accused Products
Abstract
An RFD reader includes a transceiver configured to receive a first radio frequency signal reflected off at least one surface to provide baseline signal information and a second radio frequency signal reflected off the at least one surface and an object to provide further signal information. A comparator is configured to compare the baseline signal information and the further signal information to provide a signal comparison. A processor is configured to detect the presence of the object in accordance with the signal comparison. A determination is made whether the object is in motion in accordance with the signal comparison. The determination whether the object is in motion is made in accordance with a continuous fluctuation of the second radio frequency signal. A determination whether the object is no longer in motion is made in accordance with an ending of the continuous fluctuation of the second radio frequency signal.
28 Citations
20 Claims
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1. A system, comprising:
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an RFID transmitter positioned about one side of a portal, wherein the RFID transmitter is configured to transmit a first radio frequency signal and a second radio frequency signal in a monitored region; an RFID receiver positioned about another side of the portal, wherein the RFID receiver is configured to receive the first radio frequency signal and the second radio frequency signal, the first radio frequency signal reflecting off of a surface of an object to be monitored and the second radio frequency signal not reflecting off of the surface of the object to be monitored; a comparator configured to compare the first radio frequency signal with the second radio frequency signal to provide a signal comparison; and a processor configured to determine, based on the signal comparison, whether the object to be monitored has been positioned in the monitored region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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positioning an RFID transmitter about one side of a portal; transmitting, via the RFID transmitter, a first radio frequency signal and a second radio frequency signal in a monitoring region; positioning an RFID receiver about another side of the portal; receiving, via the RFID receiver, the first radio frequency signal and the second radio frequency signal, the first radio frequency signal reflecting off of a surface of an object to be monitored and the second radio frequency signal not reflecting off of the surface of the object to be monitored; comparing the first radio frequency signal with the second radio frequency signal to provide a signal comparison; and determining, based on the signal comparison, whether the object to be monitored has been positioned in the monitored region. - View Dependent Claims (18)
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19. A system, comprising:
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an RFID transmitter positioned about one side of a portal, wherein the RFID transmitter is configured to transmit a first radio frequency signal and a second radio frequency signal in the monitored region; an RFID receiver positioned about another side of the portal, wherein the RFID receiver is configured to receive the first radio frequency signal and the second radio frequency signal, the first radio frequency signal reflecting off of a surface of the object to be monitored and the second radio frequency signal not reflecting off of the surface of the object to be monitored; and a processor configured to determine, based on a signal comparison of the first radio frequency signal and the second frequency signal, whether the object to be monitored is positioned in the monitored region. - View Dependent Claims (20)
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Specification