User Manual

7.2. Effective detection distance
The detection range of the radar module is greatly related to the target
RCS and environmental factors. The effective detection range may change
with changes in the environment and the target. This module does not have a
ranging function for the time being, so it is normal for the effective detection
range to fluctuate within a certain range.
7.3. Radar biological detection performance
Because human biological characteristics belong to ultra-low frequency and
weak reflection characteristic signals, radar processing requires a relatively
long cumulative processing. During the cumulative process, many factors may
affect the radar parameters, so occasional detection failure is normal.
7.4. Power
The radar module requires higher power quality than conventional
lowfrequency circuits. When powering the module, it is required that the
power supply has no threshold glitches or ripples and that it effectively shields
the power supply noise caused by accessory equipment.
The radar module needs to be well grounded. Due to the ground noise
brought by other circuits, the performance of the radar module may even be
reduced or even work abnormally; the most common cause is a shorter
detection distance or an increased false alarm rate. In order to ensure the
normal operation of the VCO circuit inside the module, the power supply
requirement for this module is + 5V- + 6V power supply, voltage
ripple≤50mV. The external power supply must provide sufficient current
output capability and transient response capability.
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