I'm developing an app on Android Studio for step detection.
I refer on this paper : https://www.mdpi.com/1424-8220/17/11/2573
I can't understand the highlighted part, what is it this ϴ angle? In Android Studio is possible to retrieve this (ϴ) angle rate for the magnetometer and the gyroscope?
the paper said also this:
Each of the axes of the sensor measure a component from the magnetic field vector depending on the non-coplanar angle between the vector and the axis based on the cosine rule. As the frame orientation changes during the motion of the user, the component will vary in a repetitive form.
