EasyRadar Sensor Evaluation Kit
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4
Understanding the display
Figure 4
Screenshot of the main GUI window and elements in the display scene.
Viewing a radar target spectrum for the first time might be confusing for the beginner. However,
with some practice, it is easy to find targets and understand why some things work while others
might not.
The above picture shows a typical spectrum output of the sensor when placed on a tabletop and
looking to the ceiling.
There is some DC component on the left side. If this DC offset is high, it might trigger a false target
detection of the CFAR operator.
Around 60 cm to 180 cm there might be some clutter which is rejected by the CFAR operator.
Around 200cm there is the first ceiling echo, which should be quite high versus the neighboring
noise floor. Using a lens will make this target peak thinner and higher and more easily detectable
by the CFAR operator.
Due to the adaptive nature of the CFAR operator it might happen that if two targets are too near to
each other or are very different in magnitude, one of them is rejected by the CFAR operator.
Playing around with the target recognition settings might help in this situation.
For the interested reader we will dig a little deeper into the signal processing flow of the sensor.