2.2. Data processing
The data processing is done in Matlab. The processing of the inertial nodes starts with filling the
packets lost in the wireless communication. Since some inertial nodes are mounted tilted, the outputs
have to be corrected for this tilt. From the raw acceleration data the tilt of each node is calculated. The tilt
is used to generate a rotation matrix. The raw data is multiplied with the rotation matrix to correct the
data for the tilt of the inertial nodes. The next processing step is filtering the acceleration data. A high
pass filter is applied to the data to remove the gravity component in the accelerations. The final
processing step for the accelerometer data is low pass filtering the accelerometer data.