Research On RFID Wireless Positioning System Location Algorithm

As the technology improves,the wireless technology is rapidly growing,and the demand for location services is getting higher and higher,wireless technology is a hot topic for people's atte ntion and research.Currently,there are many wireless positioning technologies,such as ultrasonic technology?infrared technology?GPS technology?WiFi technology?RFID(Radio Frequency Ident ification)technology etc.RFID technology is not only wireless Radio Frequency technology,but also works by using Radio Frequency signals to identify specific targets and read relevant inform ation.RFID technology has advantages of low cost and high positioning accuracy.Compared wit h other wireless positioning technologies,RFID technology has obvious advantages,and RFID te chnology is undoubtedly the first choice for wireless positioning technology.The RFID wireless positioning system mainly includes the(Location Identification Based on Dynamic Active RFID Calibration)algorithm and the(Virtual Reference Elimination)algorithm.This paper mainly studies the two positioning algorithms,and achieves certain results.The main research contents of the author and the research results obtained are as follows:(1)The research and improvement of the LANDMARC algorithm.According to the traditional LANDMARC positioning area,it is the shape of the rule(usually square and rectangle),while the actual location scene is affected by the conditions of the site.It is not possible to be the pattern of the rule.In this paper,a special scene positioning of the LANDMARC algorithm in the elliptical locating area is proposed,and the error correction method is used to recalciate the positioning error and improve the positioning accuracy.(2)The VIRE algorithm interpolation and the optimization of the VIRE algorithm.Based on the traditional VIRE algorithm,the linear interpolation method is used to solve the problem that the RSSI value of the virtual reference tag is not accurate in nonlinear.In this paper,the interpolation method of VIRE algorithm is used to calculate the RSSI value of the virtual tag using the nonlinear interpolation method of range interpolation.The RSSI value of the electronic tags of VIRE algorithm are affected by the noise in the environment,resulting in the problem of inaccurate RSSI value.The method of gaussian filtering is used to process the collected RSSI values,and the VIRE algorithm is positioned.Finally,the error correction method of the tags are used,and the error correction of the positioning tags are used.The experimental results show that the improved VIRE algorithm has a higher positioning accuracy.(3)Research on 3d location algorithm of RFID.The method of sliding anti-pulse interference average filtering was used to process the tag RSSI data collected by the reader.The relationship betweenRSSI value and distance was constructed by SVR(support vector regression machine)algorithm.Finally,LS(least square method)was used to solve the position coordinates of the tag to be determined.In this paper,it is verified that the improved algorithm proposed by the author has higher positioning accuracy through a series of experimental comparisons.