Research On UWB-based Indoor Positioning Error Compensation And Base Station Automatic Configuration Technology

Location-based services are becoming more and more important,and the global navigation and positioning system basically meets the human outdoor positioning and navigation needs.Due to the fact that electromagnetic waves are difficult to penetrate reinforced concrete materials,their application in indoor environments is restricted.The urgent needs of social development for indoor positioning technology,as well as the rapid development of computers,wireless communications,integrated circuits and digital signal processing technologies,have led the development of a variety of indoor positioning technologies,such as RSS signal strength,QR code and UWB Technology etc.Relying on strong positioning accuracy and anti-interference ability,UWB technology has gradually evolved into the main direction of indoor positioning technology.Similar to the global navigation and positioning system,a large number of base stations need to be deployed in the initial stage of construction,which consumes a lot of manpower and material resources.The indoor environment is relatively complex,and the multipath effect is more obvious,which affects the accuracy of navigation and positioning.Therefore,it is necessary to consider the convenience of the system base station construction and improve the positioning accuracy.In response to the above problems,this article has carried out research work and obtained some results from the following aspects:1)For a class of linear network topology,a semi-autonomous base station coordinate configuration technology is researched and designed.It mainly involves the three concepts of "segmentation","virtual triangle" and "two-way calculation".By segmenting the larger network,the cumulative error generated during the configuration process is reduced;after segmentation,the two base stations before the segment are manually configured,and the coordinates of the remaining base stations are calculated by constructing a virtual triangle sequence and forwarding;forward calculation.After completion,do the reverse execution operation.Through the two-way calculation,the forward and backward data can be merged to improve the positioning accuracy.Simulation verification results show that the algorithm is feasible and reduces the time for system construction and configuration.2)For the non-line-of-sight NLOS environment,based on the "inertial principle" and combining the concepts of "virtual inertial point" and "environmental influence factor",a high-precision positioning compensation method under indoor NLOS environment is researched and designed.Use IMU to calculate the movement trend of the tag node and obtain the coordinates of the "virtual inertia point";respectively calculate the distance between the "virtual inertia point" and the actual measurement point in the ideal LOS and NLOS environment in the same area,and the ratio of the two distances is defined as the environment.Impact factor,used to reflect the impact of the environment on the positioning accuracy;The environmental impact factor is used as a weighting coefficient to realize the fusion processing of the "virtual inertia point" and the measurement point,so as to achieve the purpose of coordinate error compensation in the NLOS environment;use the Kalman filter to smooth the compensated coordinates to further improve the positioning accuracy.The experimental results show that the method can effectively compensate the NLOS error and improve the positioning accuracy of the system.