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CCS/IWR6843ISK-ODS: The Maximum Value of Range Profile

user5995505
Prodigy 170 points
Part Number: IWR6843ISK-ODS

Tool/software: Code Composer Studio

In VitalSigns demo, I know that range profile is selected from the range of startIndex to endIndex through 1D FFT.

If there is no one in the scene during the measurement, the value of 1D FFT has never changed much.

But in my case,  I changed the startIndex and endIndex during the measurement, so that the different ranges of range profile was obtained.

Surprisingly,  I always get a very large value every time when I get a new range profile.

In this picture, I changed startIndex and endIndex every 600 frame.The value of the Y axis is the maximum value of range profile after smoothing.

Why is there such a strange phenomenon as described above?

  • 0
    TI__Mastermind 23725 points

    Hello,

    It will help to know what are you trying to accomplish.

    Also if you do not do the changes you have mentioned what does the equivalent plot looks like. The explanation of plot would also be needed to better help you.

    Please be aware that implementation provided in the Vitial signs demo is an example implementation for post processing to detect the  Hearrate.

    If you have questions about the RF signal and rang plots. Please try to separate them from the post processing question so that they can be answered in correct context.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    Prodigy 170 points

    The GUI of vital signs demo is used to decision breathing rate and heart rate.

    In breathing case, if rangeBinValueUpdated is greater than the threshold, it means someone in the scene. If outSumEnergyBreathWfm is greater than the threshold value, it means that the person being measured has enough energy to breathe.

     

     

    If I understand the above correctly, I want to use the characteristics of rangeBinValue to search someone in the scene and determine the range of the measured person without knowing the distance.
    So I tried two situations, one is that there is always someone during the measurement, and the other is that someone is always sitting at 2.3m from the radar. Then I plotted the range profiles for each frame in both cases and compared them.

    Pic1. No one

    Pic2. Someone is sitting at 2.3m from the radar

     

    But both cases have a large value at the beginning of the switch Index. It will affect the judgment of whether someone is in a certain range.

    I want to ask what is causing this situation? Thanks!