Following the popularity of smart phones and the development of mobile
Internet, the demands for accurate indoor positioning have grown rapidly
in recent years. Previous indoor positioning methods focused on plane
locations on a floor and did not provide accurate floor positioning.
In this paper, we propose a method that uses multiple barometers as
references for the floor positioning of smart phones with built-in
barometer sensors. Some related studies used barometric formula to
investigate the altitude of mobile devices and compared the altitude
with the height of the floors in a building to obtain the floor number.
These studies assume that the accurate height of each floor is known,
which is not always the case.
They also did not consider the difference in the barometric-pressure
pattern at different floors, which may lead to errors in the altitude
computation. Our method does not require knowledge of the accurate
heights of buildings and stories. It is robust and less sensitive to
factors such as temperature and humidity and considers the difference in
the barometric-pressure change trends at different floors. We performed
a series of experiments to validate the effectiveness of this method.
The results are encouraging.
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