Research Of Combination Navigation Technology Based On TC-OFDM

As an emerging strategic industry,location based service plays an extremely important role in fields such as post-disaster relief,medical services,mobile,etc.The TC-OFDM(Time&Code Division-Orthogonal Frequency Division Multiplexing)positioning system was researched and developed independently by Beijing University of Posts and Telecommunications,which has achieved precise positioning results based on mobile stations for the first time.This dissertation has carried on a thorough research on IMU-based integrated positioning as well as map matching technology,so as to reduce the probability of region misjudgments of positioning point,further more to solve the problem of positioning inaccuracy and discontinuity,as well as poor user experience.This dissertation finally realized the TC-OFDM based integrated navigation and positioning system.The main contents are as follows:The first one is the research of the IMU based integrated positioning technology,in which the introduction of the pedestrian inertial navigation system and filtering algorithm come in the first place,then getting the combined positioning method of wireless positioning information and inertial sensor(such as compass,accelerometer)information,by which parts of the low positioning accuracy or even unpositionable problem caused by factors such as signal interference.Testing results show that the combined positioning method can improve the accuracy,reliability and continuity of positioning results.The second one is the research on map matching technology,this dissertation put forward a multidimensional electronic map matching technology combined of inertial measurement unit,high pressure technology as well as indoor multi-dimensional geographic information.By which the floor is correctly matched,and the probability of region misjudgments of positioning point is reduced.Compared with the traditional vehicle map matching technology,this technology is more suitable for structures with great complexity,road networks with high density,and staff with unpredictable behavior.Measured results show that we can get a better user experience using the above map matching technology.The third is realization of TC-OFDM based integrated navigation and positioning system,which include the introduction of wireless positioning system and positioning terminal,the writing of navigation and positioning software,and the testing of software performance.