The Key Models And System Of GNSS/UWB Network Positioning

With the acceleration of urbanization,navigation and positioning information service has brought great improvement and convenience to people's life,but Global Navigation Satellite System cannot work in indoor environment due to the interference of multi-path effect,so how to quickly complete the positioning of people in indoor scene in the complex structure of urban dense buildings.Especially for large shopping malls,subway,power system,water conservancy system and other livelihood workers,precise positioning is particularly critical.For this reason,this paper designs and implements an GNSS/UWB network positioning system.Firstly,the overall design of the system is carried out,including demand analysis,database design,positioning equipment design and data interface design.Then,on the basis of building the mainstream Java framework SSM,the data transmitted by the positioning equipment is integrated and solved by using the GNSS/UWB tightly combination positioning model,which improves positioning accuracy of the terminal in indoor and outdoor scenes.Using the optimized station selection model of positioning base station,this paper studies and analyzes the influence of the spatial topology structure of base station on the positioning accuracy under the rectangular deployment,circular deployment and random deployment.According to the test results,it can be seen that the spatial topology structure between base stations is better under the circular deployment,effectively reducing the positioning error caused by the signal overlapping area and the shadow area.Moreover improving the system positioning accuracy.Finally,the dynamic deployment process of base station fast networking is studied.The positioning assisted routing algorithm is used to select the routing path with the lowest cost value of signal transmission and determine the location of the new base station based on the evaluation of positioning results,which effectively saves the power of the base station,improves the networking performance and positioning accuracy.However,this deployment method consumes a lot of manpower and material resources.So in the actual life positioning scene,it is necessary to take appropriate networking mode of base station layout according to the situation at that time,and accurately and quickly locate the trapped people.In addition,the system can closely track the mobile location on the two-dimensional map through the terminal real-time track and historical track playback function.It making up the current lack of real-time monitoring software for mobile terminal track.And it provides a scientific reference for the real scene to carry out personnel scheduling.