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IWR6843AOP: Unable to get decent point cloud using OOB demo

CHEN SHAO
Prodigy 65 points
Part Number: IWR6843AOP

Hi,

  I am currently doing a human posture project using IWR6843AOP. From a lot of articles and information from this thread, I was suggested to use oob point cloud. But the point cloud is quite random and the points are too few, which is very different from the video demonstrated in https://training.ti.com/intelligent-fall-detection-using-ti-mmwave-sensors. In the video, the point cloud has a decent number and a clear human shape. So what should be done to achieve a good point cloud like the one in the video. Can someone give me a demo close to the one used in the video or any articles that I can turn to?

  • 0
    TI__Genius 14415 points

    Hello,

    Depending on the settings you are using for range and velocity resolution, this may impact the point cloud density. Please see the SDK user's guide for information on changing the CFG file parameters to increase these. I suggest tuning for the smallest range and velocity resolution values you can achieve to increase pointcloud density. You may also need to adjust the cfar and chripcfg parameters to adjust the pointcloud output.

    Programming Chirp Parameters in TI Radar Devices (Rev. A)

    "C:\ti\mmwave_sdk_03_05_00_04\docs\mmwave_sdk_user_guide.pdf"

    Regards,

    Jackson

  • 0 in reply to Jackson Thomas
    Prodigy 65 points

    Thanks for your reply. I have tried to tune the smallest range, which I think would be changing the range resolution to a smaller value. According to the ariticle you sent, I should increase the Sweep bandwidth of FMCW chirp. And if I want to decrease velocity resolution, I should number of chirps in a frame. But I havn't found both of the parameter above in the config file. Could you please tell me how to adjust range and velocity resolution by changing the config file. Thank you very much.

  • 0 in reply to CHEN SHAO
    TI__Genius 14415 points

    Hello,

    Please see the documentation for profileCfg and frameCfg commands in the above SDK user's guide, those will be the commands to change to change sweep BW and number of chirps. The BW will be set by the slope and ADC sampling time. 

    Regards,

    Jackson