A real-time monitoring method for spatial position changes of radio frequency identification tags

Abstract

The invention discloses a method for monitoring the space position change of radio frequency identification tags in real time. The method comprises the following steps that S01, a processor sends a control signal to start each transmitting circuit and closes a signal synthesis unit through an inverter in each transmitting period, and the processor writes sector wave main lobe azimuth angle data corresponding to the period into a phase control unit; S02, the phase control unit converts a sector wave main lobe azimuth angle into a control signal for each numerical control delay line, and writes each control signal into the corresponding numerical control delay line; S03, a signal generation unit outputs radio frequency signals, each numerical control delay line delays the corresponding radio frequency signal, each transmitting circuit modulates the corresponding radio frequency signal, each matrix-arranged antenna transmits the corresponding radio frequency signal finally, and a sector wave main lobe is synthesized spatially; S04, the radio frequency identification tags are activated within a space range covered by the sector wave main lobe, and a signal response is transmitted in a subsequent reading period; S05, the processor receives a response signal of each radio frequency identification tag and judges the response signals in real time according to monitoring requirements.

Description

technical field [0001] The invention relates to a real-time monitoring method for the spatial position change of a radio frequency identification tag. Background technique [0002] Radio frequency identification, RFID (Radio Frequency Identification) technology, also known as radio frequency identification, is a communication technology that can identify specific targets through radio signals and read and write related data without establishing mechanical or optical contact between the identification system and specific targets . [0003] US Pat. No. 7,528,721B2 (2009, Levin et al.) implements checkerboard positioning of radio frequency identification tags on a plane. It can be used to monitor the position change of the radio frequency identification tag, but for the monitoring of the position change of the radio frequency identification tag, there are still the following deficiencies: 1. It only monitors a two-dimensional plane; 2. The distance and angle of the monitoring ...

AI Technical Summary

Problems solved by technology

It can be used to monitor the position change of the radio frequency identification tag, but for the monitoring of the position change of the radio frequency identification tag, there are still the following deficiencies: 1. It only monitors a two-dimensional plane; 2. The distance and angle of the monitoring plane relative to the antenna are strongly It affects the design accuracy of the system, the application requires customization and irregular calibration, and it is not easy to finalize the product; 3. The scanning cycle is long to complete the grid traversal of the plane, and the monitoring is not real-time enough; 4. The RFID tag density is less than 0.5 per grid In some cases, there are many blank areas in the traversal scan, which wastes time and energy; 5. The control software and hardware are relatively complicated

When this technology is used to monitor the position changes of radio frequency identification tags, in addition to the advantages of three-dimensional space, there are still disadvantages such as distance affecting design accuracy, difficulty in productization, time-consuming, waste of resources, and complicated control.

Images