Pedestrian Tracking System for Handheld Devices - Using Accelerometers and Magnetometers

• Main Authors: Chen, Yi-Ting, 陳依廷
• Other Authors: Tseng, Yu-Chee
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/73332669950909033466

碩士 === 國立交通大學 === 資訊科學與工程研究所 === 97 === 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.