Datasheet

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7.3 Radar biodetection performance
As human biometric features are ultra-low frequency, weakly reflective
signals, radar processing requires a relatively long period of cumulative
processing, and many factors may affect the radar parameters during the
cumulative process, so occasional detection failures are normal.
7.4. power supply
Radar modules require higher quality power supplies than conventional low
frequency circuits.
When supplying power to the module, the power supply must be free of
threshold burr or ripple and effectively shielded from power supply noise
caused by accessory equipment.
The radar module needs to be well grounded, as ground noise from other
circuits can also cause degraded performance or even abnormal operation
of the radar module; most commonly resulting in reduced detection range or
increased false alarms.
In order to ensure the normal operation of the module's internal VCO
circuitry, the power supply to the module is required to be +5V to +6V with a
voltage ripple of ≤100mV.
The external power supply must provide sufficient current output capability
and transient response.
8. common problems
Interference factors: Radar is an electromagnetic wave detection sensor and
moving inanimate objects can lead to false alarms. Movement of metals,
liquids, can lead to false positives. Often, electric fans, pets close to the
radar and the swaying of metal curtains can cause false alarms. Radar needs