紀要論文

スマートフォンの複数センサを利用した歩行者位置測定

Indoor Positioning System Using Multiple Sensors in Smartphones

jpn

18810667

https://doi.org/10.15002/00010526

法政大学大学院情報科学研究科

9

83

88

2014-03

Version of Record

As location-based services such as pedestrian navigations are widely used, it is required to extend its coverage area, especially to GPS-denied indoor environments. The pedestrian dead reckoning (PDR), which can estimate indoor personal positions by using self-contained sensors in devices such as accelerometers, gyroscopic sensors, and magnetometers, is one of solutions for extending the service coverage. These sensors, however, involve errors on their outputs, and these errors degrade the accuracy of estimating personal positions. This paper, therefore, examines to reduce sensor errors by fusing self-contained sensors in devices. First, this paper evaluates sensors' performances at the time when they are applied to existing PDR methods. This paper reveals cases of which the gyroscopic sensor and magnetometer shows high/low accuracy. Second, based on sensors evaluations, new direction estimation methods are built to cancel sensor errors by fusing sensors. In the proposed methods, mean magnetic fields are calculated with considering device rotation, and then, past estimated directions and positions are adjusted to the mean magnetic fields, dynamically. Finally, both existing and proposed PDR methods are evaluated in a measure of accuracy. As a result, the proposed method with multiple sensors is more accurate to estimate directions and positions than that with a single sensor.

Article

AA12222297