Research On Key Technology Of Wireless Positioning Based On TD-SCDMA

With the continuous development of mobile communication technology, People areincreasing demands for wireless mobile positioning technology. According to the technicalfeatures on Time Division-Synchronous Code Division Multiple Access(TD-SCDMA) technique,combining with mobile wireless positioning principles, methods and technologies, the subjecthas design process of TD-SCDMA wireless positioning technology, analyze the related factorsand the evaluation index on affecting positioning precision, research discrimination andsuppression algorithm of the Non-Line-Of-Sight (NLOS) signal of correlation peak rangingbased on the uplink synchronous sequence, research methods of TD-SCDMA wirelesspositioning and location solution under the condition of multi-base stations.The main work and contributions of this subject can be summarized as follows:(1)It is introduced that the development status of mobile wireless positioning technologyand TD-SCDMA wireless positioning technology. The features and main advantages ofTD-SCDMA system are analyzed, and TD-SCDMA network structure and the method ofcorrelation peak ranging are reserached. It provides the theoretical basis for related research ofdeveloping TD-SCDMA wireless positioning methods.(2)It analyzes systematically the realization manner and the workflow about TD-SCDMAwireless positioning technology, researches the main factors that can affect the positioningprecision, analyzes the evaluation index of positioning precision, and provides the basic idea andmethod basis for further designing, researching and validating.(3)The method of correlation peak ranging based on the uplink synchronization sequence isresearched, TD-SCDMA signal about processing on sending and receiving and channelenvironment are simulated, and ranging precision under the different Signal-to-Noise Ratio isanalyzed. Then the discrimination algorithm of the Line-Of-Sight (LOS) and NLOS signal andthe LOS signal reconstruction algorithm based on the NLOS suppression technique areresearched based on simulation analysis of the correlation peaks ranging. The performance ofalgorithms is verified with establishing corresponding simulation platform. It provides thenecessary technical support for studying on TD-SCDMA wireless positioning methods andalgorithms.(4)It is analyzed that the manner of TD-SCDMA wireless positioning, under the conditionsof a single base station and multi-base stations, research TD-SCDMA wireless positioningmethods. Chan, Taylor and Fang location solution methods are analyzed emphatically, adopts the collaborative solution method of the Chan and Taylor location information in TD-SCDMA firstly.According to the related researching on the influence factors and the evaluation index ofpositioning precision, the analytic environment of the algorithm performance is established, andin order to verify rationality and validity, under the different conditions and environment,performance of related algorithm is simulated.