Research On The Technignes Of Base Station Localization Based On Spread Spectrum Signals

With the development of modern science and wireless network communication technology, the goal of obtaining location information is becoming increasingly important. With the advantages of Spread spectrum system are widely used in radio positioning systems. Synchronization of the Pseudo-code is a key part of Spread Spectrum positioning system, Pseudo-code synchronization process typically includes: Pseudo-code acquisition, Pseudo-code track and carrier synchronization. Therefore, Pseudo-code synchronization technology in Spread positioning system has been researched, the Pseudo-code track and carrier synchronization section made emphatic research and discussion.Firstly, the theory of spread spectrum techniques were derived and analyzed, two common Spread positioning methods are described in detail.Secondly, a common Pseudo-code acquisition method were derived and analyzed, and presents an optimization algorithm based on the traditional Pseudo-code acquisition algorithm. Through the results of the simulation shows that the optimized algorithm of Pseudo-code acquisition method reduced the average acquisition time without increase the hardware complexity.Thirdly, the Pseudo-code tracking loop and carrier tracking loop of spread spectrum signal were described in detail. In order to reduce the complexity of the carrier tracking loop, a method of the phase and frequency discriminators share one discriminators were presented.Finally, proposed a method for extracting a carrier difference phase based on the carrier positioning method. To reduce the positioning error of the positioning system, we use pseudo-distance positioning method which is assisted by the method of carrier differential positioning. Experimental results show that the use of pseudo-distance positioning method which is assisted by the method of carrier differential positioning improved the positioning accuracy of the positioning system.