无线时间同步的TDOA室内定位系统

An Indoor Localization System Using Wirelessly Synchronized TDOA

关键词:  无线时间同步  室内定位  到达时间差

Key words:  Wireless clock synchronization  Indoor localization  Time difference of arrival （TDOA）

摘要:

为获得高精度的定位结果，无线定位系统中通常需要对基站进行精确的时间同步，因此提出了一种利用无线信号完成基站间时间同步的方法。首先建立了定位观测量模型，分析了系统定位原理，基于定位原理分析提出了一种基站间无线时间同步方案和固定偏差校正方法。而后给出了到达时间差（TDOA）定位算法及其改进方法。最后给出了基于以上原理的定位系统设计和实现方案。在实际场景下的试验验证结果表明，所提出的方案可以实现基站间的无线时间同步，并给出正确的用户终端定位结果。

Abstract:

For wireless indoor localization systems, time synchronization between base stations is required to obtain highprecision localization results. Therefore, a time synchronization scheme utilizing wireless signals is proposed. Firstly, a localization measurement model is established and the principle of localization is analyzed. Based on the localization principle analysis, a wireless time synchronization scheme between base stations and a fixed deviation correction method are proposed. Then the time difference of arrival (TDOA) localization algorithm and its improvement method for special use cases are derived. Finally, detailed design and implementation scheme of the localization system are given. Experimental results in real environments show that the proposed scheme is capable of synchronizing base stations using wireless signals and generates accurate localization results.