一种基于WiFi的改进型室内位置指纹定位方法

摘要

In the prior inventions, WiFi fingerprint positioning system ’ s accuracy cannot be fully achieved resulting from the complexity and variability of indoor environment.This paper provides an improved method that can be adopted to increase the in-door positioning accuracy of handheld positioning device.Through analyzing how human body influences WiFi signal and how WiFi access points change at different locations, the said accuracy is achieved by increasing location fingerprint parameters inclu-ding angle of the handheld device and the number of access points.The two parameters make our normal fingerprint database more abundant.The positioning test results from comparing the normal fingerprint database with the improved fingerprint database prove the later positioning more accurate.%在室内WiFi位置指纹定位系统中，由于室内环境的复杂性及易变性，定位精度很难得到保证。通过实验测试分析人体对WiFi信号的影响以及不同位置设备接入点数目的变化情况，本文提出一种在手持设备的定位系统中增加位置指纹特征以提高定位精度的改进型定位方法。该方法将手持设备的方向角和接入点数目这2个位置特征加入位置指纹中，丰富了离线数据库的位置特征。通过对常规位置指纹库定位和改进的位置指纹库定位的测试对比，得出使用改进的位置指纹库定位可以提高系统的定位精度的结论。