Reading Method of Physical Characteristic Data of RFID Radio Frequency for Wireless Perception

RFID technology has been widely used in identification and positioning, with the deepening of its application study, researchers found that the technology can also be used to achieve wireless perception, and the acquisition of physical characteristic data such as phase angle, RSSI and Doppler frequency is the key and premise to realize wireless perception. However, at present, there is no report on the methods of reading the physical characteristic data of these RF signals. In this work, based on the widely used Impinj Speedway R420 system, we firstly discussed the RFID system architecture and the Low Level Reader Protocol (LLRP) protocol, and then we explain the connection and configuration between the reader and the host, as well as the configuration of the eclipse development environment. Moreover, we also give a program algorithm for reading those physical characteristics data of the RF signal. Finally, authors put forward the method of improving the reading accuracy, and give the use of experimental data is discussed comprehensively.