The Design Of The Handheld Reader Based On RFID

Radio Frequency Identification is a kind of non-contact automatic identification of communication technology,which automatically identifies the target object through the radio frequency signal,and quickly carry out the items tracking and data exchange.It is applied in modern intelligent vehicle management,intelligent road management system,to achieve the complex traffic intelligent management.The article first introduced the working principle of the RFID system,and the reader’s architecture.Secondly,it introduces the knowledge of automobile electronic identification system,Then the design scheme handheld reader based on actual market demand.Handheld reader for the mobile reader products,and fixed readers,in addition to the identification of electronic license plate function,but also has a removable,positioning,Bluetooth printing,photography and other functions.The design of the handheld reader includes hardware design and software design.Hardware design using modular design method,divided into digital module,radio frequency module and antenna module.Digital module refer to the smart phone program,in addition to the radio frequency data acquisition outside the function,the radio frequency module operating frequency is 920-925 MHz,Complete the data collection and electronic tag information interaction,the antenna module used to radiate and receive radio waves.The software is designed using the Android operating system,radio frequency business using the application of the way to provide visual interface.In this article,the detailed study of the radio frequency data collection used in the core technology innovation leakage,and uses the cancellation signal to cancel the leakage signal.The amplitude of the leakage signal is smaller than that of the original leakage signal.The final realization of the hand-held RFID reader to launch the forward radio frequency signal,leakage to the reverse receiving channel leakage signal to cancel.Thus avoiding the defective performance of the reader when the passive reader is working,the leak signal affects the reader’s reverse reception performance,while also improving the sensitivity of the passive RFID reader.