Research On High Precision Positioning System Based On UWB

Nowadays,outdoor positioning such as GPS has been very mature,Bei Dou global positioning system is becoming more and more mature,and the application of civil field is more and more in-depth.For the indoor environment,GPS and Bei Dou signals cannot reach the room,and it is difficult to complete the indoor positioning for items.Due to the changeable indoor scenes and complex environment,the demand for wireless signal indoor positioning applications is also increasing largely.As a relatively new wireless communication technology,ultra-wideband(UWB)signal has gradually occupied a certain share in the field of indoor positioning due to its various advantages.In this paper,based on UWB signal as a means of communication,related research work is carried out on ranging and positioning algorithms.Compared with traditional positioning methods,the accuracy of indoor plane positioning and indoor stereo positioning is improved.In this paper,the traditional positioning method is analyzed and improved,and combined with the intelligent algorithm,the following experimental research is carried out :(1)In this paper,the source of indoor positioning error is discussed.After comparing several traditional positioning methods,Time of Arrival(TOA)method based on UWB is chosen,and several traditional positioning algorithms are introduced.(2)Improved the traditional algorithm based on the traditional trilateral positioning algorithm.An adaptive correction is performed on the ranging value obtained during the positioning process,and the initial result is substituted into the Taylor expansion series for positioning.Using this method,the indoor plane static positioning and dynamic trajectory description are carried out.And draw scatter plots and trajectory maps from experimental data,and perform error analysis with other algorithms.Compared with Chan and improved Chan,it has a great improvement,which is increased by 72.8 % and 66.62 % respectively,and the positioning accuracy of cm level is achieved.The effectiveness of the improved algorithm is verified.(3)After the improvement experiment based on the traditional algorithm,the popular intelligent algorithms are introduced.Several intelligent algorithms are compared and a snake optimization algorithm is introduced.The snake optimization algorithm is combined with the adaptive ranging strategy.Chaotic mapping optimization and sine cosine optimization are introduced into the snake optimization algorithm to improve the local and global optimization ability.The plane and stereo positioning experiments are carried out to analyze the error and algorithm efficiency.The experiments show that the improved algorithm can effectively enhance the accuracy of indoor stereotactic locating.(4)Based on the common algorithms and intelligent algorithms optimization experiment,a set of B/S system is designed to display the location information processed by the algorithm in the background on the web page in real time,and realizes the service of real-time display of location information.