Research On Ultra-wideband Positioning And Software Design In Corridor

With the development of navigation positioning and wireless technology,the application of ultra-wideband positioning technology in the corridor has received extensive attention.In view of the reduction of positioning accuracy caused by complex corridor environment and the need of positioning service on software,this article carried out the research ultra-wideband positioning and the design of software.This article firstly analyzes the technical requirements and indicators of the corridor positioning system.In practical application in corridor environment,the AML algorithm based on TDOA has evident positioning deviation in some areas when the number of anchors is small or the arrangement of anchors is unreasonable.The reason for this deviation is obtained through theoretical analysis,and the possible deviation areas are obtained by simulation.In order to eliminate this deviation,this paper uses the environment of the corridor and the motion state of objects as a priori knowledge to assist the algorithm select the suitable solution.And this paper adds Kalman filtering to improve of the accuracy of the algorithm.In order to verify the effect of the new algorithm,this paper carry out the simulation test and application test of the improved algorithm in corridor environment.In view of the complex environment of corridor,this paper studies the impact of anchors arrangement on positioning accuracy.This paper firstly studies the influencing factors on positioning accuracy on in fixed-point situations by theoretical deduction of TDOA's CRLB formula.And the criteria for anchor deployment in fixed-point positioning are given.Analogous fixed-point positioning,the influence of anchors' relative position,anchors' deployment inclination and anchors' deployment distance on positioning accuracy in corridor are studied.And the criteria for anchors' deployment in corridor environment are given.This paper uses the B/S architecture to design the overall structure of the UWB upperlayer positioning software system,including the three-tier architecture of positioning calculating center,business service center,and positioning service center.Combined with the three-tier architecture,the data flow diagram and difficulties of development are given.The system has the functions of creating and loading maps,setting warning areas,setting stations,entry and exit records of warning area,working hours records,tags configuration,tags positioning records,anchors information,anchors status records and equipment monitoring.According to above functions,this paper completed the development work and displayed development results respectively.Finally,this article tests the developed system.Tests focuse on setting warning areas,working hours records,improved algorithms,and anchors' deployment.It is shown that the system functions are running normally,the test results are consistent with the theoretical research conclusions,and the positioning accuracy meets the requirements.System meets the application requirements of real-time monitoring,personnel management,and security assurance in the corridor.