Radio frequency ID Doppler motion detector
First Claim
Patent Images
1. A radio frequency identification (RFID) reader for use in an RFID detection system, the reader comprising:
- an RF source for generating RF signals;
an antenna coupled to the RF source, the antenna detecting communication signals within an interrogation zone received in response to RF signals from an RFID marker within the interrogation zone, the communication signals include Doppler signals indicating movement of the RFID marker within the interrogation zone;
a receiver for receiving the communication signals from the RFID marker; and
motion detection circuitry for detecting the Doppler signals,wherein the reader operates in a first power mode not suitable for interrogating the RFID marker, and upon detection of incoming Doppler signals the reader switches to a second power mode suitable for interrogating the RFID marker, the second power mode being greater than the first power mode.
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Abstract
A system and method for a radio frequency identification (RFID) reader for use in an RFID detection system. The reader has an RF source for generating RF signals. An antenna is coupled to the RF source. The antenna transmits interrogation RF signals to one or more RFID markers within an interrogation zone and receives communication signals from one or more items within the interrogation zone. The communication signals include Doppler signals indicating movement of an item within the interrogation zone. A receiver receives the communication signals and motion detection circuitry detects the Doppler signals.
40 Citations
17 Claims
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1. A radio frequency identification (RFID) reader for use in an RFID detection system, the reader comprising:
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an RF source for generating RF signals; an antenna coupled to the RF source, the antenna detecting communication signals within an interrogation zone received in response to RF signals from an RFID marker within the interrogation zone, the communication signals include Doppler signals indicating movement of the RFID marker within the interrogation zone; a receiver for receiving the communication signals from the RFID marker; and motion detection circuitry for detecting the Doppler signals, wherein the reader operates in a first power mode not suitable for interrogating the RFID marker, and upon detection of incoming Doppler signals the reader switches to a second power mode suitable for interrogating the RFID marker, the second power mode being greater than the first power mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An RFID detection system comprising:
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one or more RFID markers; and an RFID reader comprising; an RF source for generating RF signals; an antenna coupled to the RF source, the antenna detecting communication signals within an interrogation zone received in response to RF signals from the one or more RFID markers within the interrogation zone, the communication signals include Doppler signals indicating movement of the one or more RFID markers within the interrogation zone; a receiver for receiving the communication signals from the one or more RFID markers; and motion detection circuitry for detecting the Doppler signals; wherein the reader operates in a first power mode not suitable for interrogating the one or more RFID markers, and upon detection of incoming Doppler signals the reader switches to a second power mode suitable for interrogating the one or more RFID markers, the second power mode being greater than the first power mode. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of operating an RFID marker reader, the method comprising:
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transmitting a detection signal at a first power level mode not suitable for interrogating an RFID markers, to detect movement of the RFID marker within the interrogating zone; and transmitting an interrogation signal at a second power level greater than the first power level to detect the presence of the RFID marker when incoming Doppler signals are detected within the interrogating zone, the interrogation signal being suitable for interrogating the RFID marker. - View Dependent Claims (14, 15, 16, 17)
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Specification