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Original question:

AWR2944EVM: AWR2944EVM "double of the range resolution for one single object" equals "the minimum recognizable distance between...

AWR2944EVM: Why the range resolution of two objectives is 2 times a single objective?

Sean Ho
Prodigy 80 points
Part Number: AWR2944EVM

Hi TI experts,

I have a question about the definition of Range Resolution. If I adjust the slider of Range Resolution over the Demo Visualizer to 0.179m, the sensor can recognize the minimum movement of an objective is 0.175m.  This result makes sense. The result is shown in picture 1.  However, the sensor can only recognize two objectives with a 0.35m separation. The result is shown in picture 2.

Question: Why the range resolution of two objectives is 2 times a single objective? 

Picture 1: Single object with step of 0.175m movement

Picture 2: Two objectives with a 0.35m separation

Thanks,

Sean

  • 0
    TI__Guru 69960 points

    Hi Sean,

    Let me forward this thread to right expert. Please expect response in a day.

    .

    Regards,

    Jitendra

  • 0
    TI__Mastermind 20605 points

    Hi Sean,

    Here is the general definition of range resolution.

    "The smallest distance between two objects that allows them to be detected as separate objects is referred to as range resolution."

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    Prodigy 80 points

    Hi Kaushik,

    I appreciate your prompt reply.


    The picture below shows what I set for my experiment. The slider of Range Resolution is adjusted to 0.179m. So, according to the definition you mentioned, the sensor can recognize two objects with a 0.179m separation. However, in my experiment, only more than 3.5m of separation between two objects can be recognized by the sensor. (Please refer to picture 2 in my previous post.)

    Question 1: I am confused about the definition and result. Could you help me clarify it?

    Question 2: According to picture 1 in my previous post, the sensor can recognize the minimum movement of a single objective is 0.175m. This complies with my setting of 0.179m. Why is the result coherent to the setting?

    Thanks,

    Sean

  • +1 in reply to Sean Ho
    TI__Mastermind 20605 points

    Hi Sean,

    Please see my comments below.

    • The definition of range resolution still holds true.
    • What you are observing could happen due to the CFAR thresholds set in the configuration (It is always suggested to finetune the same on your end). Can you try reducing the thresholds when configuring the sensor and see if there is any improvement?
    • I would also make sure that you are using 2 strong reflectors in the case of both objects, as one strong object next to a weak one could mask the signals of the weak objects.
    • If you see the range profile, you should be able to observe 2 peaks in consecutive bins in the FFT spectrum.

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    Prodigy 80 points

    Hi Kaushik,

    Thank you for the suggestions. I will try to adjust the CAFR threshold. 

    Regards,

    Sean