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AWR1642BOOST: Improved SRR accuracy

Part Number: AWR1642BOOST
Other Parts Discussed in Thread: AWR1642

I installed the AWR1642 at the back of the bicycle, with a height of about 1M. When using the SRR example for vehicle detection, the detectable distances of various vehicles are as follows:
Truck: 80m
Sedan: 40~60m
Scooter & Bike: Undetectable
Is there a way to improve the detection accuracy of Sedan and Scooter?