The Research On Location Technologies And Correlated Algorithms Based On Mobile Network

Since America FCC issued E-911 criterion, the challenges and progress in meeting the E-911 requirement for location service and future positioning technologies in mobile network have been developing in speedup state. Many location techniques and algorithms are presented one after another. Each of them has their own advantages but also some deficiencies. Because these location techniques and algorithms are easy to be interfered by channel and system noises to cause many measuring and computing errors, their location accuracy, precision and reliability are still not satisfied, thus several algorithms for increasing location accuracy and reliability are presented in this thesis to eliminate NLOS and multi-path effects by indirect anti-interference processing so as to make up and perfect location technologies.The research on location accuracy and reliability is a very utility and challenge study task. The new location technologies and algorithms have to inform more precise position information in three-dimension space and offer more reliable location services. From the point of systems analysis, the integrated or hybrid location method combining with different location technology to make use of all kinds of measured parameters and redundancy data is a better choice to get more precise and reliable location than single technical method, and also a better compromise scheme for mobile location which is a main aspect of location algorithm adopted in the thesis.In this thesis, some researches on the configuration integrality of network location system and key technologies for increasing location accuracy and reliability are carried out. The main innovation works are listed out as below:1. By studying synchronization mechanism of location system, an algorithm pattern with cooperative synchronization within relative stratification and carrier phase statistic difference was set up. So formerly separated synchronization mechanism could be unified in harmony with needed precision. By multilevel difference processing, the algorithm can observably cancel errors produced by synchronization and parameter measuring, so the location accuracy and system reliability can be improved greatly. Simulation results shown that the algorithm could be carried out by needed synchronization precision according to system requirement, which also eliminated synchronization errors and measured errors observably.2. The location processing in mobile network usually needs more channel parameters to carry out location operation. A location algorithm with antenna arrays difference in three-dimension space was presented, which simplified array difference algorithm from exponential equation group into linear plane equation group, and also canceled signal interferences in transmitted channel and decreased number of bases required for system...