AWR1843BOOST: Calibration with "measureRangeBiasAndRxChanPhase", negative value for <rangeBias>

Amirkhosro Vosughi

Part Number: AWR1843BOOST

Hi,

I have a question regarding the calibration of the antenna using "measureRangeBiasAndRxChanPhase" CLI command.

I successfully did calibration and got some values for<rangeBias> and <Re(0,0)> <Im(0,0)> ... <Im(T-1,R-1)>. My question is specifically about the value <rangeBias>. We obtained a negative value for <rangeBias> of our antenna based on calibration. When I enter this number to the .cfg file in front of compRangeBiasAndRxChanPhase CLI command, It does not return any detected object.

I did some tests with TI AWR1843BOOST radar and mm Demo Visualizer with the default setting to check the effect of different <rangeBias> values. For that, I save the default .cfg file. Then, I only change <rangeBias> in the .cfg file and reload it into the board. For all positive <rangeBias> values, we can still detect points. However, for negative values less than -0.06, no point is detected, although we can see a sharp pick in the (Relative Power)/(Range) plot when we expect to detect the objects. Please enclosed find the picture of the test result when is pointed to the same stationary side with three different settings for <rangeBias> to 0, 0.1, and -0.1. Would you please help us to understand what is the problem?

Thanks

Amir

<rangeBias> = -0.1

<rangeBias> = 0.0

<rangeBias> = 0.1

over 4 years ago

0 Cesar over 4 years ago

TI__Guru*** 148304 points

Hi,

We will be able to get back to you next week

thank you

Cesar

0 Cesar over 4 years ago in reply to Cesar

TI__Guru*** 148304 points

In the meantime,

Please use google site search to find related threads:

site e2e.ti.com measureRangeBiasAndRxChanPhase

Here are some of the threads

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/673284/awr1642-the-questions-about-the-function-mmwdemo_rangebiasrxchphasemeasure

Thank you

Cesar

0 Amirkhosro Vosughi over 4 years ago in reply to Cesar

Prodigy 20 points

Hi Cesar,

Thank you very much for your response. I have already search on google and e2e before posting this question over here and unfortunately, I cannot find the answer to my question.

Thanks for sharing to link to the threat about the calibration process, I went through it and it describes the calibration progress in general; however, my question is specifically about setting negative values for <rangeBias> less that -0.06 which results in detecting no point in my setup.

I am looking forward to hearing from you about this problem and the appropriate solution for it.

Thanks

Amir

0 Amirkhosro Vosughi over 4 years ago in reply to Amirkhosro Vosughi

Prodigy 20 points

Hi Cesar,

I am wondering to know if there is any update about my question?

Thanks

Amir

0 Kyle Cousino over 4 years ago in reply to Amirkhosro Vosughi

TI__Mastermind 24955 points

Amir,

I completed some testing today on the AWR1843BOOST. I also tested with a negative value for the <rangeBias> but I did not encounter the issue of not seeing any detected points after that.

Perhaps you need to adjust your CFAR settings after applying the rangeBias value. This CFAR setting can be adjusted in real-time when using the web-based GUI visualizer tool: https://dev.ti.com/gallery/view/mmwave/mmWave_Demo_Visualizer/ver/3.5.0/

Please make sure to review the documentation regarding the procedure for capturing the coefficients for range bias and RX phase compensation. You can review the steps in the "Range Bias and Rx Channel Gain/Offset Measurement and Compensation" section in the Doxygen for the Object Detection Data-path Processing Chain (DPC) found below.

file:///C:/ti/mmwave_sdk_03_05_00_04/packages/ti/datapath/dpc/objectdetection/objdethwa/docs/doxygen/html/index.html

Regards,
Kyle

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AWR1843BOOST: Calibration with "measureRangeBiasAndRxChanPhase", negative value for <rangeBias>