IWR6843ISK: 3D People Counting demo - not detecting people walking away

Yotam Nitzan

Part Number: IWR6843ISK

Hello,

We are trying to reproduce the people counting lab.

We have used the chirp configs provided in the sdk - "ISK_6m_default.cfg", "ISK_14m_extended.cfg" and discovered that when people are walking away from the radar they are not identified as a track.
For example, if the person enters the scene from behind the sensor, he is not identified as a valid track. We can see a set of points corresponding to the person, but he never becomes a track.
Conversly, when the person is walking towards the radar, he is tracked immediately. Also, if the person was previously identified as a track, he can walk away from the sensor and still be tracked. So it's an issue only when acquiring the track initially.

I this behavior expected? I'm assuming not. What could be causing such behavior and how can we resolve it?

Thanks,
Yotam.

over 2 years ago

0 Nathan Block over 2 years ago

TI__Mastermind 37805 points

Hi Yotam,

Please consult the tracking layer tuning guide seen here. There is a section on making tracks easier to form.

https://dev.ti.com/tirex/explore/node?a=1AslXXD__1.00.00.26&node=A__AAwhSXiV2o4yQlaiTsMgQg__radar_toolbox__1AslXXD__1.00.00.26

Best,

Nate

0 Yotam Nitzan over 2 years ago in reply to Nathan Block

Prodigy 20 points

Hi Nathan,

The problem we are experiencing is not that the tracker is not "sensitive" enough. When people are walking towards the radar, they are tracked nicely. When they are working away from the radar, they are not. To alleviate any doubt, we also tuned the parameters suggested by the guide but it did not solve the issue.

Closer examination revealed that this issue is clear when observing the point cloud directly. People walking away from the radar induce less points and they are less consistent, i.e., the points disappear and reappear.
We also found that this problem does not occur with the IWR2843AOP.

Any idea why this would happen?

Thanks,
Yotam.

0 Nathan Block over 2 years ago in reply to Yotam Nitzan

TI__Mastermind 37805 points

Hi Yotam,

We do not have a 2843 radar device, but perhaps you're referring to the 6843AOP device? We have seen this behavior before where more points are generated by people approaching the radar and fewer when they walk away. But this has not been observed to vary across devices. Our theory is that the way people move creates more points as they approach the radar through their arms and body position.

Best,

Nate

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IWR6843ISK: 3D People Counting demo - not detecting people walking away