标题: 手持装置行人追踪系统
Pedestrian Tracking System for Handheld Devices - Using Accelerometers and Magnetometers
作者: 陈依廷
Chen, Yi-Ting
曾煜棋
易志伟
Tseng, Yu-Chee
Yi, Chih-Wei
资讯科学与工程研究所
关键字: 个人导航系统;全球定位系统;加速度计;磁力计;计步器;微机电系统;室内/室外定位;行动定位服务;Personal navigation system;global positioning system;accelerometer;magnetometer;pedometer;MEMS;indoor/outdoor location;location based services
公开日期: 2008
摘要: 为了改进全球定位系统的缺点,例如:定位准确度、室内讯号不良,近年来个人导航系统成为了一个热门的研究题目。大部份的个人导航系统均以计步器为基础并利用微机电系统实作,藉由在使用者身上黏贴微机电系统来收集、分析资料,来计算使用者行走的步数、距离及方向,以便追踪使用者的移动路径。微机电系统黏贴的位置可分为:脚或脚踝、腰间、手持…等,由于使用者的手会产生不规则的抖动或振动,因此实作手持装置定位的难度,相较于其他黏贴位置来得更加困难。
在本研究中,利用微机电系统实作了手持装置行人追踪系统,所使用的装置包括加速度计及磁力计;此系统包含了三个模组:计步模组、步距模组及方向模组。计步模组藉由检查加速度资讯并抓取步行样本,来侦测使用者是否有走路的行为,同时滤除使用者手部的振动对装置造成的杂讯;步距模组利用计步模组所抓取的步行样本来估算此样本所对应的步距;方向模组则利用磁力强度和加速度资讯来计算手持装置的欧拉角和手持角度。
藉由整合上述三个模组的输出资讯,我们实作了行人追踪系统。使用者只需手持此系统的硬体装置(约一般手持装置大小),系统即可追踪使用者的移动轨迹并输出;此系统可应用在各种手持装置上,进行室内及室外的个人定位;未来将会与全球定位系统整合,以改善全球定位系统之缺点,对于都市、室内及室外的个人导航都相当有帮助,同时也可应用于提供行动定位服务与家庭看护上。
The Personal Navigation System (PNS) becomes a popular research topic recently because people want to improve the shortcomings of Global Positioning System (GPS) such as accuracy and indoor usability. A lot of such systems are pedometer-based system which could be implemented using Micro Electro-Mechanical Systems (MEMS) and attached to different positions on a human body. The handheld pedometer is less than other locations such as foot and waist because the device held by one's hand has more noises and it is more difficult to model the human walking pattern.
In this paper, a Pedestrian Tracking System (PTS) is designed for handheld devices and implemented using accelerometers and magnetometers. It is composed of three modules: stepping module, stride module and direction module. The stepping module detects a step occurrence of user through pattern matching in acceleration and filters the noises like shaking and vibrations. The stride module acquires the parameters of a step pattern from stepping module, and calculate the corresponding stride length of the step pattern. The direction module uses magnetic intensity and accelerations to evaluate the Euler angles and holding angles of a device.
By integrating the outputs of stepping module, stride module and direction module, the Pedestrian Tracking System is implemented. This system, which can be embedded into cellphones or PDAs easily, is feasible for indoor or outdoor personal positioning with a given initial position. In the future, the PTS could be integrated with the GPS for improving the positioning accuracy of both. It is very helpful for personal navigation in urban areas, indoor and outdoor environments and could be applied in providing location based services and home healthcare, etc.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079655564
http://hdl.handle.net/11536/43369
显示于类别:Thesis


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