YU Le, LI Yang-yang, LI Yang-guang, et al. Design of 9-axis inertial measurement unit for virtual reality[J]. 2017, 36(7): 100-102. DOI: 10.13873/j.1000-9787(2017)07-0100-03.
A 9-axis inertial measurement unit( IMU) based on Kalman filtering which is key device for motion tracking in virtual reality( VR) technology is designed and realized. Quaternion is used as state vector
and the attitude angle which is calculated from accelerometers and magnetometers is used to compensate for gyro drift. The IMU is designed with a sampling frequency of 1 kHz. Test by connecting cell phone and upper PC
the 9-axis IMU can achieve fusion and correction of attitude angle very well.