| Due to the increasing demand of location,the server of position has made rapid development.The indoor location system based on Linear Frequency Modulation Continuous Wave(LFMCW)has many advantages,like high precision,large capacity,high dynamic measure and low cost,and it also a vital direction of indoor location system in the future.This thesis researches on relevant synchronization technology based on LFMCW signal model,and designs synchronous system programs,which focuses on the synchronization technology of indoor location system based on LFMCW.The design prototype verifies the effectiveness of the synchronization system.The main works include:1.Analyzed and compared common time-synchronization methods,which include common-view method and two-way method which are used in satellite location.Studied whether these methods was eligible,which combined characteristics of high precision timing synchronization method of LFMCW indoor location system.2.Used shot-distance channel and center controlling module of synchronization to broadcast the time-synchronization news.Every base stations and location cards check the timestamp and analyze the time-synchronization news to achieve pre-synchronization.3.On account of characteristics of high precisiontime measure of LFMCW indoor location system,a common-view time synchronization method based on LFMCW was proposed,which include the whole scheme design,choose parameters,module design and work flow.And also analyzed the stability of the synchronization system.Due to discrepancy among crystal oscillators produced by different manufacturers,the effect of this phenomenon was analyzed and simulated.4.In the end,a prototype based on common-view method was developed,and so do one based on two-way method.Verified these two systems based on experiments. |
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