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AWR1642: Rain fading to the detection distance

Martin Ho
Intellectual 545 points
Part Number: AWR1642

Hi Akash,

   In the thread https://e2e.ti.com/support/sensor/mmwave_sensors/f/1023/p/627119/2317023#2317023 

   Although we don't have any explicit test data, mmWave Sensors can detect the same distance on a rainy day. If you'd like to discuss this more then feel free to open up a new thread!

   Since water could reflect radar wave, the SNR should be lower on a rainy day. Could you explain why mmWave sensor can detect the same distance on a rainy day ? Thanks.

Martin 

  • 0
    TI__Mastermind 28227 points

    Hello Martin,

    Rain causes indeed some attenuation, but unless you consider extreme weather events, this attenuation level is fairly low. Please refer to this document from the FCC about mmwave propagation (link, pages 7 and 16, and especially figure 10 on page 15). For example, a 25 mm/h rain corresponds to an attenuation of about 13 dB/km around 80 GHz. This translates to 1.2 dB at a 50 meters range, accounting for the round trip of the waves.

    Thanks,
    François.