一种面向位置数据隐私保护的离线地磁定位模型

Offline geomagnetic positioning model forlocation privacy protection

基于位置服务给人们的生活带来极大的便利,而目前定位系统特别是室内定位普遍依赖于无线网络信号.很多情况下,用户有位置隐私保护的需求,然而,在目前的大数据时代,基于网络的室内定位服务要求用户将个人位置信息实时提供给服务提供商,这导致用户隐私的泄露.如何有效实现室内的基于位置服务,并且保护用户的个人位置信息就成了大数据时代的一个关键问题.本文介绍了一种面向位置数据隐私保护的离线地磁定位模型,利用加速度传感器和微机电磁力计检测行人步态和地球磁场来实现室内定位.本模型利用加速度计检测行人的步态信息,配合磁力计检测的磁场信息与指纹地图进行匹配,实现了室内定位需求的同时又解决了用户位置信息泄露的问题,为大数据时代如何保护用户的位置信息提供了一个有效的解决办法.

Location based service brings great convenience for peoples life.At present,most of the positioning serv-ices in indoor environment are based on the wireless network.However,big data makes the user＇s personal informa-tion no longer privacy.In particular,the service provider will obtain the user＇s personal location information in realtimewiththe network-based positioning service.How to protect user＇s location information is an important issue in thebig data era.This paper introduces an offline geomagnetic positioning model for indoor location data privacy protec-tion. This model uses the accelerometer to detect pedestrian gait information and match the magnetic fieldinformation detected by the magnetometer with the fingerprint map.It can not only provideindoor location service,butalso solve the problem of user＇s location information disclosure,thus gives an effective solution to user location pri-vacy protection.