The Study Of Indoor Location Algorithm Based On RFID Technology

At this stage, with the rapid development of mobile communication and indoor wireless technology, indoor positioning technology has also become one of the hot topics for people to explore and research. Indoor positioning system based on indoor wireless technology has good commercial value and industrial prospects, but typical indoor positioning technologies such as infrared, ultrasonic, GPS, now unable to meet the requirements of high-precision, and radio frequency identification (RFID) have advantage of low-cost, non-line-of-sight, non-contact positioning performance, so that it can become a leader in the field of indoor positioning. Although in recent years there are many classic RTTD-based indoor positioning system or algorithm, but due to the complexity of the indoor environment, multipath interference between the RF signals makes indoor positioning algorithm for high noise immunity and high positioning accuracy the new requirements.At first, we give an overview of the key technologies for indoor positioning, and do analysis of the classic indoor positioning algorithm, Fang algorithm, LANDMARC algorithm, VIRE algorithm, and introduce their respective advantages and disadvantages. On the basis of the above, we explore and improved from three aspects on the layout of the Reference Tag, Virtual Reference Tag interpolation and the nearest Tag weights defined law. Firstly, we analyse the shortcomings of rectangular Tag layout through probability and geometry, put forward a triangle Tag layout, and the accuracy of the positioning algorithms improve3.4%with reducing the number of Tag. Secondly, combined with the variability of the indoor environment and two-dimensional Newton interpolation method we proposed a new the Virtual Reference Tag interpolation function. The average positioning accuracy increased by27.4%and9.8%compared to the linear interpolation and Lagrange interpolation method, and it also increases the stability of the positioning system. Finally, according to the radio channel propagation model, according to the analysis of simulation, the formula weights defined method based on the distance-lossa curve results2.1%increase on positioning accuracy.In summary, the system’s positioning accuracy and stability has been significantly improved through the improvement based on the three aspects of the RFID indoor positioning algorithm in this paper than LANDMARC algorithm and VIRE algorithm through simulation results proved.