VB20SL User Guide
Page 16 of 30
Smoothing and Filtering
Velocity:
The VB20Sl has three smoothing settings (Dynamic Modes) for velocity, High Dynamics, Normal and Low Dynamics. High dynamics has the least
amount of smoothing and must be used for high dynamic tests where Time or Distance measurements are critical to the test, such as Brake stop and
acceleration tests.
Slip, Pitch Angle and Acceleration channels:
The smoothing routine is set by selecting a value from 0
– 5.0 in 0.1 steps. This value corresponds the size in
time (S) of a moving window smoothing routine.
e.g. if 0.3 is selected then a smoothing window of 0.3 seconds (6 samples @20Hz) will be applied to the data.
Kalman Filter:
This filter provides filtering separately to the Velocity and Position channels (long, lat and height). Note with any live filter routine more latency will occur if
higher levels of filtering are used. Hence the Kalman filter velocity settings should be set to zero for Brake stops and acceleration runs.
It is often better to record un-filtered data then use software filter routines after if necessary as these will have much less impact on latency.
