计算机与现代化

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一种基于WiFi的改进型室内位置指纹定位方法

  

  1. (1.上海海事大学科学研究院,上海201306;2.上海海事大学航运技术与控制工程交通行业重点实验室,上海201306

  • 收稿日期:2015-11-25 出版日期:2016-04-14 发布日期:2018-09-30
  • 作者简介:刘志鹏(1991-),男,江西赣州人,上海海事大学科学研究院硕士研究生,研究方向:检测技术与室内定位技术; 袁敏(1956-),男,江苏南通人,上海海事大学航运技术与控制工程交通行业重点实验室高级工程师,研究方向:工业自动化应用。

An Improved Indoor Positioning Method Based on WiFi Fingerprinting

  1. 1. Scientific Research Academy, Shanghai Maritime University, Shanghai 201306, China;2. Key Laboratory of Marine Technology and Control Engineering Ministry of Communications, Shanghai Maritime University, Shanghai 201306, China

  • Received:2015-11-25 Online:2016-04-14 Published:2018-09-30

摘要:

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。

关键词: WiFimso-ascii-font-family: 'Times New Roman', mso-hansi-font-family: 'Times New Roman'">; mso-ascii-font-family: 'Times New Roman', mso-hansi-font-family: 'Times New Roman'">位置服务; mso-ascii-font-family: 'Times New Roman', mso-hansi-font-family: 'Times New Roman'">室内定位; mso-ascii-font-family: 'Times New Roman', mso-hansi-font-family: 'Times New Roman'">位置指纹; mso-ascii-font-family: 'Times New Roman', mso-hansi-font-family: 'Times New Roman'">信号强度

Abstract:

 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 indoor 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 including 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.

Key words:

text-indent: 21pt">WiFi, LBS, indoor positioning, location fingerprint, signal strength

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