IWR6843: 3d People counting elevation split (increase and decrease) as the object move away from radar

Wolfgang Jalma

Part Number: IWR6843

Dear TI,

We have custom antenna IWR6843 device, that can run OOB demo without any problem (and radiation pattern is similar to the TI one, albeit gain and directivity is higher (11 dBi instead of 9 dBi),hence beam is narrower) . But when we run 3d People counting with mounted on wall configuration, with the sensor height is 1.5m, the height of the people decrease as the person move away from the device. Another information that maybe useful is while we see most of the person point (cloud) height is decreasing when moving away from device, the height some of point from higher position (as we think from head area) will increase instead. Do you have any Idea why this problem is happening? For sure, the antenna beam is not splitted in the Z(height) direction.Thank you very much.

Sincerely yours,

Wolfgang

over 3 years ago

0 Jackson Thomas over 3 years ago

TI__Genius 14415 points

Hello,

Can you please clarify exactly which 3D people counting binary you are using and from which toolbox? And can you please confirm which CFG file you are loading? Also, which antenna design is your board closest to? Did you make any modifications in the antenna geometry or virtual antenna configuration?

Regards,

Jackson

0 Wolfgang Jalma over 3 years ago in reply to Jackson Thomas

Intellectual 283 points

Hi Jackson.

Thank you for the replay.

I use the prebuild binary from MMwave Industrial toolbox 4.9. The CFG file that i used is the original cfg file (no modif at all) in that toolbox, especially the ISK_6m_default.cfg, but this happened when i use other cfg, including ISK_6m_staticRetention.cfg and ISK_14m_extension.cfg. The antenna geometry is exactly the same as the original isk antenna, just every element in antenna array is a bit different (when original antenna has 3 patch antenna/array, we have 6 patch /array instead, for higher gain). And I don't make any modification in any software, hence no modification in virtual antenna configuration.

Thank you very much.

Regards,

Wolfgang

0 Jackson Thomas over 3 years ago in reply to Wolfgang Jalma

TI__Genius 14415 points

Hello Wolfgang,

How are you measuring the height change? Are you looking at it in the data output of the device? Or are you using the python based visualizer? The visualizer will output the coordinates adjusted for the tilt angle of the device. The default for wall mount in the CFG is 15 degrees. If the device is not mounted with a downward tilt of 15 degrees the height will change as the person moves away. You can modify the tilt angle in the CFG file in sensorPosition.

3D_people_counting_tracker_layer_tuning_guide.pdf

Regards,

Jakcson