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IWR6843ISK: How can I use data of radarCube in pplcount demo?

Part Number: IWR6843ISK
/*! @brief Pointer to Radar Cube memory in L3 RAM */
cmplx16ReIm_t *radarCube;
1. In the water_ground demo, it uses radarCube to get the real part and the imagine part information to calculate rcs. What's the meaning of the real and imagine part?
2. I found the fact that radarCude was used many times in pplcount demo, where should I fetch data to calculate rcs_value of each point in the point cloud?
  • Hi,

    Regarding question 2:

    • You can't calculate RCS of the target from Radar data alone
    • The people counting demo returns the SNR of the target, which will give you an idea of its relative strength.

    Why do you want RCS?

    Regards,

    Justin

  • Thanks for your replication.

    I want to distinguish static people from environment.
    So I made reference to the water_ground demo, and found that it used RCS for classification.
  • Hi,

    In ground vs water, we can separate the two by looking for movement in water - the radar sees small movement on the surface, like ripples and waves, so we know it is water. Ground does not move, so we can classify it as ground.

    You can try lowering CFAR parameters (use the slider in the GUI) to try to separate the person from the couch.
    In doaCfg 600 1875 30 1 1 0, try lowering the second value to 1200 or 1000.

    Regards,
    Justin
  • In your example, the person can be easily separated by movement.

    But how can we separate a person(also static) sleeping on the couch from other static items(such as a drawer)  around him? 

  • Hi,

    Making the sensor more sensitive to small movements, like breathing, is a potential solution. Changing the DOA config as mentioned helps with that.

    You may also simply have software that tracks the person until they enter the bed, then remembers that they are there, even if it can't see them.

    Regards,
    Justin