1. D2m. http://d2m-inc.com/. D2m. http://d2m-inc.com/.
2. Ellipsoid or sphere fitting for sensor calibration. www.st.com/resource/en/design_tip/dm00286302.pdf Ellipsoid or sphere fitting for sensor calibration. www.st.com/resource/en/design_tip/dm00286302.pdf
3. Hawk-eye. https://en.wikipedia.org/wiki/Hawk-Eye/. Hawk-eye. https://en.wikipedia.org/wiki/Hawk-Eye/.
4. Inertial measurement unit. https://stanford.edu/class/ee267/lectures/lecture9.pdf Inertial measurement unit. https://stanford.edu/class/ee267/lectures/lecture9.pdf
5. Motioncapturesystems-vicon. https://www.vicon.com/. Motioncapturesystems-vicon. https://www.vicon.com/.