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. 2021 May 12;21(10):3357. doi: 10.3390/s21103357

Figure 2.

Figure 2

Coordinate system for the tracking algorithm. The sensor is positioned at (x,y,z) with an orientation denoted by θ and φ. The magnetic field resulting from the ith coil is indicated and the associated flux is determined using the dot product between the sensor’s directional unit vector and the magnetic field at that point [17].