IWR6843ISK-ODS: "Range Bias and Rx Channel Gain/Phase Measurement and Compensation" not work in 3D People counting demo?

Hello

Allow us to confirm for each of the demo.

Conceptually the same blocks as in the OOB demo can be applied here.  Would you help us understand if there are any specific  issues you are seeing on the existing examples that is making you consider the addition of calibration.

Thank you,

Vaibhav

Hello

Have your tried the coefficients from the the OOBdemo and used them on the demos.

Can you please share what has been the response from device for this.

Thank you

Vaibhva

Hi Vaibhva,

Let me explain why we want to have calibration.

We have a custom pcb which is the same design of the IWR6843ODS.

However, we found that the range of radar sensing area can't reach 6m x 6m , but just  ~3m x ~3m.

We test it with the overhead_demo_visualizer.

We can see from the gui.

When the target running out from the sensor ~1.5m (on both east, west, south-west, south - east direction), the target stop on this area even the target is going out further .

Seems the FOV (field of view) can't have 60deg in our custom pcb.

There are no this issue on the IWR6843ISK-ODS evaluation board with the same cfg file and set up.

So, we try to do the calibration to see if we can get some improvement. 

Thanks.

Tom

Hi Team

Do you have source code of 3D people counting Demo, if you have ,could you send it to me 

Best regards,
William

Hi Vaibhva,

Yes, we have tried and no any output from the sensor.

The calibration coefficients:

compRangeBiasAndRxChanPhase 0.104491943 -0.251776984 -0.019140794 0.315451984 0.039100794 0.293860556 -0.067136508 -0.230248492 0.028963175 -0.714138413 0.16072254 0.995930317 -0.087275952 0.819209127 -0.225619365 -0.622807222 0.171797222 -0.27807 0.079231349 0.373701905 -0.084856984 0.30139254 -0.125055159 -0.235686111 0.098113254

We copy and paste above to the chirp_configs file of overhead 3D people count demo then run the "overhead_demo_visualizer".

After load the updated chirp_configs file, no any output from the GUI.

If we using the below original configs, we can see that sensor works as normal and the GUI can display related point clouds and detected objects. 

compRangeBiasAndRxChanPhase 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 

Thanks,

Tom

Hi William,

All the source code is in the folder C:\ti\mmwave_industrial_toolbox_x_x_x.

You can also check it in TI Resource Explorer.

For any further questions, please create a new thread in the forum.

As your question is not relate to the title of this thread.

Thanks.

Tom

Hello

Based on the details provided  the issue seems to be (Please confirm):

1. Custom PCB antenna is unable to provide the required FoV

2. Comparison is wrt to IWR6843ISK-ODS type of antenna. (Antenna design is identical/derived from)

3. In order to get the get matching performance you feel 'calibration'  based on Antenna will help.

thank you,

Vaibhav

Hi Vaibhav,

1. Custom PCB antenna is unable to provide the required FoV

Yes

2. Comparison is wrt to IWR6843ISK-ODS type of antenna. (Antenna design is identical/derived from)

Yes, the antenna design is identical

3. In order to get the get matching performance you feel 'calibration'  based on Antenna will help.

Yes, do this  'calibration'  would improve the FoV?

Thanks.,

Tom

Hello

Thank you for confirming.

Calibration corrects offsets in measurements,   it will not help in changing/widening/increasing the field of antenna coverage.

THis would be an antenna design problem.

  It may be worth checking:

1. Antenna simulation runs for expected coverage and strength

2. Measure the actual performance for the board you have build using OOB - iterate various TX power- Rx gains combinations.

3. Identify gaps - iterate antenna design to improve  targeted gap areas.

There are various factors that affect the performance of antenna  spanning from design to manufacturing.

Please see the following appnote provided on product page TI mmWave Radar sensor RF PCB Design, Manufacturing and Validation Guide

Thank you,

Vaibhav

Hi Vaibhav,

Thanks for your information. More questions about the antenna validation.

Calibration corrects offsets in measurements,   it will not help in changing/widening/increasing the field of antenna coverage.

Then, what is the improvement of sensor after the offsets is corrected? Increase the accuracy of the position detection?

THis would be an antenna design problem.

  It may be worth checking:

1. Antenna simulation runs for expected coverage and strength

What kind of "Antenna simulation" that we can do actually? Do TI have some tools/software set for that simulation?

2. Measure the actual performance for the board you have build using OOB - iterate various TX power- Rx gains combinations.

How do we know the performance using OOB? Using the web visualize and check those graphs?

Thanks,

Tom