  In an incineration plant, remote operation from a centralized control room is
now possible, but inspection and cleaning of equipment still require a worker
to visit the site. When the plant owner reduces the number of workers due to
operation costs, it will be standard for a single worker to visit the site.
Therefore, it is necessary to monitor the location of workers in real-time to
detect unexpected human accidents quickly. Conventional methods use radio
waves, such as Wi-Fi and Bluetooth, but there is little demand for
communication equipment in the incineration plant. However, there is not enough
demand for communication facilities in the incineration plant. It is too large
to bear the cost of installing wireless access points, and Bluetooth Low Energy
(BLE) beacons just for positioning. Therefore, we are focusing on magnetism
using for indoor positioning method. In addition, the incineration plant has a
lot of types of equipment that contains a wide range of magnetized metals,
large motors, and generators. We could observe the magnetic peculiarity at each
point. Based on these assumptions, we have developed a new indoor positioning
method at the incineration plant. This paper describes the development of an
indoor positioning system for an incineration plant. And we propose three
methods for fingerprinting matching: Point matching, Path matching, and DTW
matching. The average positioning errors of these methods are 6.89 m, 0.05 m,
and 0.06 m, respectively.
