基于中国剩余定理的Wi-Fi室内精密定位新方法

摘要

针对当前室内无线局域网Wi-Fi定位方法定位精度不高的问题,提出了一种基于中国剩余定理的Wi-Fi室内载波相位精密定位新方法.该方法通过深入探究Wi-Fi技术体制对于提升测距性能的潜在辅助效能,在不改变商用硬件结构的前提下,根据Wi-Fi信号多频调制的特性,利用多个频点的载波相位测量值构建同余式组,并基于中国剩余定理进行解算实现测距,有效消除了载波相位测距中的整周模糊度,并对所提方法的测距精度、噪声敏感等问题进行了分析,给出了一种提升测距精度并降低噪声敏感性的方法.根据实际定位应用需求,分别配置载波频率、SNR、和量测距离,搭建仿真系统,该方法与现有的RSSI和TOA测距各进行100次对比仿真实验,仿真结果表明,在20 dB SNR和25 m量测距离的条件下,所提方法的平均测距精度为8.8mm,明显优于现有通用Wi-Fi定位方法,具有很好的理论和实际应用价值.%Aimed at the problem that the localization accuracy of current indoor Wi-Fi positioning method is low a new method of Wi-Fi indoor carrier phase precise location based on Chinese remainder theorem is proposed.According to the characteristics of Wi-Fi signal multi-frequency modulation,the proposed algorithm explores the potential auxiliary efficiency of Wi-Fi technology to improve the indoor ranging performance without changing the structure of commercial hardware.The congruence group is constructed by using the carrier phase measurement of multiple frequency points,and solving the group to measure distance based on Chinese Remainder Theorem,thus effectively eliminating the integer ambiguity in the carrier phase ranging.On the basis of analyzing the ranging accuracy and the noise sensitivity,a method is presented reduce noise sensitivity.According to the actual positioning application requirements,the carrier frequency,SNR,and measurement distance are respectively configured to build a simulation system.This method is compared with the existing RSSI and TOA for 100 simulation experiments.The simulation resuits show that the average ranging accuracy of the proposed method is 8.8 mm under the condition of 20 dB SNR and 25 m measurement distance.The method is superior to the existing universal Wi-Fi positioning method and is of great value to application in terms of theory and practice.