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AWR1243: Maximum possible Range with AWR1243 sensors

Santhana Raj
Expert 1765 points
Part Number: AWR1243
Other Parts Discussed in Thread: AWR1642

Hi,

 

I have a requirement on a typical ACC. I would like to detect a pedestrian at 300m away.

I am aware that as per Range Max formula (IF x C/(2xSlope)), I can detect 300m away object ideally. But I am worried about whether the antennae can pick up such low RCS object (Human) at so far away(300m).

Swra543 document talks about this limit on Range and gives the radar equation which has to be evaluated. But the values for the parameters in the formula which are specific to TI sensor are not provided.

All other documents as provided by  TI says only 250m as LRR and doesnt talk about pedestrian detection at 250m.

 

Considering all this, I would like to know whether

a) TI sensors can be used in any way to be able to detect pedestrian at 300m

b) What is the maximum range that I can detect a pedestrian?

 

Any help on this regard would be highly appreciated.

Thanks in Advance,

Santhana Raj

  • 0
    TI__Expert 4720 points
    Hi Santhana,

    Detecting a pedestrian with the standard EVM at 300m would be quite difficult.

    Have you studied the radar equation? You can plug in the nominal values of the EVM into the radar equation to get the SNR at different ranges. You can then see why detecting a pedestrian at long range would be difficult.

    Using the AWR1642 EVM , we've been able to detect moving people upto 30 m.

    Regards
    Anil
  • 0 in reply to Anil Mani
    Expert 1765 points
    Hi Anil,

    Thanks for the information. Problem is, I am not aware of the nominal values for the radar equation, like TX output power, Noise figure of the receiver, RCS or SNR.
    Can you help me in finding the values for AWr12x or AWR16x??

    Another thing I want to mention is, MMwave Sensing Estimator states an 1m^2 as RCS of the adult. With TX and RX gain as 30dB and transmit power as 12dBm, It estimates that Max range for minimum detectable object as 360m and min RCS detectable at the range as 0.44m^2.
    How trust able is this information?
    What other factor will affect this estimation.


    Thanks for any help,
    Santhana Raj
  • 0 in reply to Santhana Raj
    TI__Expert 4720 points

    Hi Santhana,

    The nominal values can be found from the datasheet (found here ). I've attached the relevant portions below.

    As far as the RCS of the target is considered 1msq is a good approximation. For SNR, I'd suggest plugging in 12 to 18 dB.

    Be aware that Antennas that offer gains of 24 dB or more have to be highly directional (Essentially horn antennas), meaning that if the target is not at boresight, the radar may not detect it. 

    Regards,
    Anil