Research on Target Activation and Identification Techniques for Mobile Terminal Localization
|School||PLA Information Engineering University|
|Course||Communication and Information System|
|Keywords||Mobile Terminal localization User Identification Estimation of Call Duration Tracking of Call Duration Kalman Filter|
In the twenty-first century, mobile communication has already become to be the importantway of communication in the real life of human being. In addition to voice, data and otherservice informations, the location information of mobile terminal is increasingly widespreadconcern. Especially in application area such as location service, disaster relief, the requirementfor location information service becomes more and more important. With the rapid developmentof the cell localization technology, the quality of location service is upgraded continuously. Butin the special application environment of lack of network support information, many localizationtechnologies of mobile terminal need urgently a breakthrough. The thesis faces to thelocalization need of mobile terminal in the condition of lack of network measurementinformation, and focuses on the target activation and identification technology. The main pointsare as follows:The thesis describes the network access security mechanisms, voice service and call flow. Itanalyses the mechanisms of mobile terminal localization, proposes the localization technology ofmobile terminal based on voice service call, and shows the design framework of two keytechnologies of target activation and identification involved in the localization technology ofmobile terminal.In the condition of lack of information, user identification technology is the key oflocalization of mobile terminal. Aiming at the problem of randomness and fast degeneration ofuser identification in the air interface of cell network, the thesis proposes a kind of useridentification algorithm of max correlation based on the double characters of number and time.The thesis gives a number of detailed test data and analysis results based on the network data.The results show that the algorithm has the excellent performance of identification in theenvironment of complicated multi-cell.The target activation technology is the important support technology of passive localizationwhich doesn’t rely on network. Especially in the localization application that requiring targetuser feel nothing, the target activation technology needs to solve the contradiction betweenreliable activation and user feeling nothing. Aiming at this problem, the thesis proposes a kind ofcall duration recognition algorithm based on two classes of estimation of call duration. The thesisgives actual test data and results analysis under multi-cell coverage scenarios. The results showthat the estimation accuracy of call duration is high, and the performance of target activation isexcellent.In the view of the changes of wireless environment and network conditions will lead to thedynamic changes in the telephone access time of mobile terminal. In order to achieve continuoustracking and positioning of the mobile terminal, it is needed to estimate the access time ofterminal. The thesis proposes a kind of tracking algorithm of call duration based on the Kalmanfilter. The thesis gives a number of actual measured data results in different environments. Theresults show that the algorithm can adapt to the dynamic changes of network voice traffic, andhas excellent performance of real-time estimation of call duration. On the basis of researches of localization algorithm of mobile terminal, the thesis describesthe whole design framework of engeneering prototype system and gives out the softwarerealization processes of corresponding algorithm and test results in the network.