Explanation Of The Detection Area; Installation Method - DFRobot SEN0521 User Manual

You can configure parameters such as detection sensitivity, detection distance,
detection time, etc. through the serial Tx and Rx pins. Please refer to the following
chapters for detailed information.
The default configuration parameters of the 5.8G Microwave Radar module may not be
suitable for all customers' actual scenarios. If the test results differ greatly from the
indicators described in the module parameter table, it is essential to use a serial tool
to reconfigure the module parameters to make the module's working parameters suitable for
the actual usage scenario, thereby achieving better testing results and performance.
1.3

Explanation of the Detection Area.

The area in which the 5.8G Microwave Radar module emits energy signals is mainly
determined by the emission beam angle. The 3D schematic diagram of the beam angle is
illustrated in the two images shown below.
Special Note: For example, if the beam angle is 120°, it does not mean that energy
signals beyond 120° cannot be detected. 120° only represents a measurement taken at a
fixed distance (such as 2 meters, 4 meters, or other appropriate distances), wherein the
measured radiation energy is 3 dB (or 0.5 times) lower than that at the 0° front-facing
position. Therefore, radiation signals do exist at positions such as 130° and 140°,
albeit with lower energies than the position at 120°. Furthermore, large objects with
strong reflective energy may still be detected at close distances and larger angle
positions, such as 130°.
1.4

Installation Method:

Installation methods mainly include "ceiling-mounted", "downward-sloping", and
"forward-facing" mounting. Due to microwave radar's sensitivity to objects in relative
motion (emitting waves directly forward along the beam), the "forward-facing"
installation method provides the best detection distance and results, making it easier to
detect slight movements and the presence of people. It also provides better detection
distance and results than the "ceiling-mounted" method.
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