Hi-Link HLK-LD2420 Посібник користувача - Сторінка 15
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Precautions during installation
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Try to ensure that the radar antenna is facing the area to be detected, and the surrounding area of the antenna is open and unobstructed.
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To ensure that the installation position of the sensor is firm and stable, the shaking of the radar itself will affect the detection effect.
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Make sure there is no movement or vibration on the back of the radar. Due to the penetrating nature of radar waves, the antenna backlobe may detect the
surface moving objects. Metal shields or metal backplanes can be used to shield the radar back lobe and reduce the impact caused by objects on the back of the radar.
into the impact.
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When there are multiple 24 GHz frequency band radars, please do not face the beam directly, and install them as far away as possible to avoid possible mutual interference.
Power Notes
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The power supply input voltage range is 3.0 V~3.6 V, and the power supply ripple has no obvious spectral peak within 100 kHz. This scheme is a reference design.
Users need to consider the corresponding electromagnetic compatibility design such as ESD and lightning surge.
8.Precautions
Maximum detection distance
The maximum range for the radar to detect targets is a radial distance of 8 m. Within the detection range, the radar will report the straight-line distance between the target and the radar. radar
Within 8 m, it can only output the distance information of a moving human body, and does not support the short-distance ranging function of a stationary human body for the time being.
Firmware baud rate change
The default serial port baud rate of the radar is 256000, and developers can modify it in the project directory \platform\py32\inc\py32_uart.h
USART0_BAUDRATE macro definition to modify the baud rate.
Maximum distance and accuracy
Theoretically, the radar ranging accuracy of this reference scheme is 0.35 m. Due to the differences in the size, state and RCS of human targets, the ranging accuracy
There will be fluctuations, and the farthest detection distance will also fluctuate to a certain extent.
Target disappear delay time
When the radar module detects that there is no human body in the target area, it will not immediately report the "no one" status in the area, but will be delayed.
The mechanism for delayed reporting is: once no human target is detected within the test range, the radar module will start timing, and the duration is the time when no one continues
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user manual