A Dual-tone Radio Interferometric Tracking System For Asynchronous Networks

With the development of technology,people's lives have been more convenient.All kinds of technology products and personalized services are increasingly richful.Wireless sensor network(WSN)positioning is becoming necessary day by day.Wireless sensor network positioning can be applied to commercial advertising to promote,precision mar-keting,intelligent management,VR equipment.For the lack of GPS signal or signal blind in some places,WSN positioning developed.At present,there are a variety of distance measurements,signal strength based on the positioning and tracking system.Such as ultra-wideband(UWB)positioning system has a high-precision positioning effect.How-ever,its system cost is too high so that can not be widely used.WiFi positioning and tracking system has some applications,but it is unstable,and low-accurate.The RF Interference Positioning System(RIPS)was proposed for the first time in 2005,using the signal characteristics and transmission characteristics of the interference signals generated by the signals from two transmitters to achieve indoor positioning.The advantage is that the two frequencies are very close to generate a low frequency envelope signal to reduce the positioning of the WSN node equipment accuracy requirements,reduce equipment costs.On basis of that,DRIPS and uDRIPS develop a new way to positioning.This paper mainly studies the indoor positioning and tracking technology based on wireless sensor network.Using the most common radio frequency sensor in the wireless sensor network,based on the theory of verification,we make corresponding improvements to achieve all-synchronous indoor positioning tracking system to reduce the tracking sys-tem equipment accuracy requirements and enhance the program feasible.Finally,we sim-ulate to test the feasibility and validity of the the asynchronous tracking algorithm.The study is divided into two parts.Firstly,based on the uDRIPS ranging to make the dy-namic positioning posible.Secondly,enhance the robustness of the tracking system to solve the relaxation of the ideal conditions after the emergence of the integer integer fuzzy problem.In this paper,an asynchronous tracking method based on dual-tone signal is designed.By estimating the samples,the special relation between phase and clock offset is obtained.Finally,we solve the phase ambiguity in the process of larger positioning scale using improved the Chinese residual theorem(Vec-CRT),and prove it by Matlab simulation.The simulation results show that the tracking algorithm is effective.The the paper have solved the synchronization problem of RF interferometric positioning,and promote the development of indoor positioning technology effectively.