System for object detection using radio frequency reflection
First Claim
1. A system comprising:
- a receiver to receive a returned RF signal including a carrier signal reflected from an object;
a transmitter to transmit an incident radio frequency (RF) signal modulated with radio frequency identification (RFID) commands; and
a processor connected to the transmitter and the receiver to extract modulated RFID responses from the returned RF signal to detect an RFID tag and to detect objects by measuring at least one of a phase and an amplitude of the carrier signal in the returned RF signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency (RF) object detector is disclosed. The RF object detector in example embodiments transmits an RF signal. A receiver measures the amplitude, the phase, or both the amplitude and phase of the signal as reflected from objects in an interrogation zone. The RF object detector can be deployed in a combined system that performs multiple functions. For example, the RF object detector can be integrated with an EAS system that also sends RFID commands and receives RFID responses. In some embodiments the object detector can discriminate between moving objects and stationary objects, and/or discriminate between objects in the interrogation zone and objects outside the interrogation zone, and/or provide location estimates. An antenna or antennas can be connected in a mono-static or bi-static configuration and the phase and/or amplitude signals can be either DC-coupled or AC-coupled into the system through a mixer.
25 Citations
9 Claims
-
1. A system comprising:
-
a receiver to receive a returned RF signal including a carrier signal reflected from an object; a transmitter to transmit an incident radio frequency (RF) signal modulated with radio frequency identification (RFID) commands; and a processor connected to the transmitter and the receiver to extract modulated RFID responses from the returned RF signal to detect an RFID tag and to detect objects by measuring at least one of a phase and an amplitude of the carrier signal in the returned RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification