Research On Ultra-wideband Positioning Technology And Algorithms

This dissertation focuses on narrow-pulse UWB wireless communication technology under the IEEE802.15.4a standard,mainly including the research of UWB key communication technologies,the research and performance comparison of UWB ranging algorithms,and the research of UWB wireless positioning algorithms.The design and simulation of various algorithms based on this and the construction of an ultra-wideband positioning system.In succession,the following researches have been conducted:(1)Introduce the UWB pulse design method that meets the FCC radiation mask,and research signal modulation and multiple access options,and the characteristics of UWB channel with multipath fading and NLOS condition are analyzed in detail.(2)First,introduce several common coherent and non-coherent ranging algorithms in UWB wireless communication systems.Then a TOA estimation algorithm based on information entropy is proposed,and the derivation process and simulation of the algorithm are introduced in detail.Compared with the root mean square of ranging error of several traditional algorithms,the accuracy of this algorithm is greatly improved compared with the traditional ranging method,which is closer to the lower limit of Cramer-Rao.(3)The two-dimensional location algorithm of TOA and TDO A is mainly introduced,and a joint 3D location algorithm based on TDOA and TOA is proposed.Compared with the traditional algorithm,the algorithm is proved to have a lower algorithmic complexity,and The positioning accuracy of the algorithm has also been improved.(4)Build ultra-wideband wireless system,carry out ultra-wideband wireless positioning performance test,verify the ranging algorithm and positioning algorithm.The experimental results show that the ultra-wideband wireless positioning system designed in this paper can achieve the positioning accuracy within 20cm of the measured node in two-dimensional plane and the positioning effect within 40cm of the mobile node.