Research And Design Of Radio Frequency Sensing Tag With Identification Sensors Data Fusion And Semi-Passive Power Supply

Radio frequency tag is an important component of information collection in the wireless communication of IoT system,and its related research and design is very important.With the development of wireless sensor technology,the research on tag identification and sensor information fusion is also very necessary.Among them,UHF RFID tags are more suitable for the design of sensor labels due to their advantages of strong anti-interference,remote transmission distance and backscattering of zero power consumption.Tags based on chip-level components design have the most prominent application advantages due to their rich identification information,stable operating performance,and short development cycle.However,with the integration of sensors,the tag must work in semi-passive state,the power supply which can monitor the performance for long time and remote distance will be more beneficial to broaden the application range of sensor tag.Therefore,it is of great practical significance to study and design the UHF RFID sensing tags of sensor fusion and semi-passive work to enrich and enhance the information collection of Internet of things.This dissertation first studied the standards followed by UHF radio frequency technology,analyzed the internal storage structure of the radio frequency chip and the current working problems of storage methods,and proposed a storage solution for the identification sensor fusion.Then,according to the three environmental parameters,such as temperature,humidity and light intensity,the selected sensor was deterined.In the part of hardware design,Cadence software was used to design the UHF RFID sensor digital module,which includes three parts:sensor acquisition,main control circuit and RF module.The impedance calculation of the RF chip was performed in the RF front-end part and the HFSS software was used.In the simulation,a folded monopole antenna suitable for UHF RF chips with impedance matching was designed.In order to realize the long-range monitoring requirement of UHF RFID tags,this paper designs a semi-passive power supply for sensing tags based on photovoltaic cells,and uses super capacitors as energy storage devices.The simulation results of the circuit meet the design requirements;then the design and simulation are performed.The pulse control switch circuit can automatically switch the power supply output source when the light is weak.Secondly,in order to reduce the leakage current of the super capacitor itself,an anti-leakage circuit is designed;in addition,the RF communication interrupt is designed to further reduce the power consumption of the tag.The energy-saving design scheme optimizes the dormancy and wakeup timing of tags.Finally,through constructing series of experimental environment,the test to verify the design of semi-passive UHF RFID tags identification sensor fusion overall performance to satisfy multiple sensor information collection,a remote radio frequency communication,power supply work stability and long-term monitoring work requirements.