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Original question:

AWR1243: TDA2X very hot when I use the DSP EVM

AWR1243: AWR1243P:The actual distance is very different from the radar measurement distance

Weiwei GUO
Prodigy 120 points
Part Number: AWR1243

Hi, TI engineer! 
 I measured the distance of stationary targets with AWR1243 radar In an empty classroom, and then processed the data with TI matlab demo(located under the installation path of MMWave Studio). I found that the target position given by MATLAB output was quite different from the actual position: For example, the straight-line distance between the target and the radar is 0.9m, but I measured it as 4m. I don't know what the problem is. Is this 4m referring to some other distance? Or is it because there is no calibration? Or is there something wrong with my operation?

I'm looking forward to hearing from you！

  • 0
    TI__Mastermind 31680 points

    Hello Weiwei, 

    Can you make sure the "Test source" is disabled in you Radar chirp configuration? By chance if that is enabled, the device will assume a virtual object at that distance (4m in your case) and show you the corresponding plots. 

    Other plausible reason that can lead to this mismatch is indeed calibration. Make sure you calibrate your cascade setup using a corner reflector atleast once and use the corresponding calibration matrix to process data. You can find the instructions in the user guide. 

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Prodigy 120 points

    Hi,Ishita,

    I did disable the test source for the test,
    Moreover, at the actual distance of 1.7 meters, the radar detected about 8m, and at the actual distance of 2.5 meters, the radar detected about 10m. It's about four times of the actual distance.（you can see the picture below)
    So, as you said, whether or not have the antenna calibrated really affect the accuracy of the ranging? I have asked other users of cascaded radar and they say that antenna calibrationt has little impact on ranging accuracy and a lot on Angle measurement.But I'm going to try antenna calibration.
    In addition, calibration in an empty classroom (empty classroom leader is feasible?

  • 0 in reply to Abhed Misra
    Prodigy 120 points

    Hi,Misra

    I found more details of this problem, but I still can't solve it.

    When my target distance is 0.8m, 1.6m, 3.2m, 2.4m, 4.0m and 4.8m, the measurement distances are 4m, 7.4M, 10m, 14m, 2m and 5m respectively .It seems that the measured distance is changing from large to small, as if the distance is blurred, but the maximum distance calculated theoretically is 15.19m, so there should be no distance ambiguity.
    In addition, I also carried out calibration. The calibration does not affect the distance, but changes the angle of the target, as shown in the figure below.
    So I still haven't solved this problem，Is there any possible solution？

    Regards,

    Weiwei

  • 0 in reply to Weiwei GUO
    TI__Genius 13805 points

    Hi,

         Can you please try to increase the distance beyond 5m and check the estimation of the measured distances?

    Regards