7 Setup reliability
7.1 Ranging on the floor
Reliability of the algorithm relies on the accuracy of the setup which detects the distance between the sensor and
the floor. This can be ensured only if nothing (e.g. no obstacle or static object) blocks the front and back FoVs.
The two figures below illustrate two cases where the distance to the floor is measured over many measurements.
The mean of the measured distances (if they equal the real distance between the sensor and the floor) and the
standard deviation, are an indication of the reliability of the setup.
It is recommended to consider a minimum distance of 700 mm between the floor and the sensor threshold as this
validates a person crossing the FoV under the sensor. This 700 mm is a good estimate of the maximum standard
deviation that we can consider in a noisy environment to define if a setup is reliable or not (see the real test
examples in the following figures).
In Figure 9. Reliable setup, the mean of the measured distances from the two zones is the same and the
minimum measured distance is less than the distance between the sensor and the floor (2600 mm) minus 700
mm. This indicates a reliable setup.
Figure 9. Reliable setup
UM2600
Setup reliability
UM2600 - Rev 1
page 9/14
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