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DCA1000EVM: The meaning of the Time Domian Plot?

user5907403
Intellectual 370 points
Part Number: DCA1000EVM
Other Parts Discussed in Thread: AWR1642BOOST

                 I use the DCA1000EVM & AWR1642Boost capture the raw data, After post processing ,I can get the time domain plot ,its coordinate label is codes, I want to know what the y-axis in the graph means? Indicates that the receiver receives power? or voltage?

        If I want to know what the actual power received by the receiver is, which technical document should I get from? Please recommend it.

       I look forward to your useful answer.Thank you!

  • 0
    TI__Guru*** 148514 points

    Hi,

    This questions has been asked many times on the forum.

    Please see one of the answer thraeds

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 370 points

           I know that the y-axis represents the amplitude of the signal after sampling, but it does not specify the unit, volt or millivolt?

          In addition, I want to know what is the electromagnetic wave polarization of the AWR1642Boost emission? Horizontal or vertical polarization？

  • 0 in reply to user5907403
    TI__Guru*** 148514 points

    Hi,

    As mentioned in referenced threads the data has no unit.

    "The Y-Axis corresponds to the FFT peak value of the detected object. This value does not have a unit and objects with a stronger reflection will produce a higher peak value."

    For the new antenna question, please start a new thread so that we can forward to antenna expert

    thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 370 points

       

                         What I am talking about is the y-axis in the Time domain plot ,but not the FFT plot !!

                        The Time domain plot  is derived from the original data and has physical meaning. The X-axis represents time. What I want to ask is what the y-axis should represent?

                         In other words，I want to know how to calculate the intensity of the electromagnetic signal received by the receiver from the original sampled data, that is, the received power.

                          

  • 0 in reply to user5907403
    TI__Guru*** 148514 points

    Yes,

    The answer was provided in the referenced threads.

    The y-axis shows the intensity of the signal that is received from the ADC. It does not have any absolute unit.

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 370 points

                Still can't find the answer I want！

                Please tell me how to calculate the receiving power.

                This must be calculated from the raw sample data.

                                                                          Thank  you!

  • 0 in reply to user5907403
    TI__Guru*** 148514 points

    Hi,

    Sorry for the delay.

    I talked with design team and here is how the Rx input power is computed for a strong reflector

    From ADC data compute dBFull Scale.

    dBFs +10 gives dBm

    dBmvalue + RxGain +3 = Rx input Power

    thank you

    Cesar