CCS/AWR1843BOOST: The relation between the CFAR threshold and 2D FFT coefficients

Rata Zhang

Part Number: AWR1843BOOST

Tool/software: Code Composer Studio

Hi,

I have some questions in the following:

1.In the SDK3.2,CFAR processing is based on the detmatrix where every element is the sum(log2(abs(xi)))/16if,i=0~txnum*rxnum-1,xi is the 2D FFT complex coefficient.For example, if there are two objects in the front of the radar,one X0 is 10,the other X1 is 50m.In theroy, the value of the point in the dematrix that stands for X0 is larger than X1.Is that right?

2. Can I understand the signal intensity returned back from the object? The farther the object is,the weaker the signal intensity.

3.Now in the demo,the CFAR threshod value is unique,I consider whether the threshod is varied based on the distance between the object and radar. The greater the distance, the smaller the value.How to choose the threshold value may be another problem.

Thanks,

Regards,

Rata

over 5 years ago

0 Cesar over 5 years ago

TI__Guru*** 140494 points

Answer #1

Please review the mmwave demo documentation. The detmatrix is a matirx of (doppler bins; range bins)

file:///C:/ti/mmwave_sdk_03_02_00_04/packages/ti/datapath/dpc/dpu/dopplerproc/docs/doxygen/html/index.html

Answer #2

You are correct

Answer #3

Yes, threshold is based on the reflected signal intensity. It is empirically determined by checking what signal intensity you have.

Thank you

Cesar

0 Rata Zhang over 5 years ago in reply to Cesar

Expert 2670 points

Hi Cesar,

Can I understand that this way?The greater the distance,the weaker the signal intesity,then the smaller threshold value is selected for CFAR processing. Is that right?

Regards,

Rata

0 Cesar over 5 years ago in reply to Rata Zhang

TI__Guru*** 140494 points

yes

Closing this thread now

thank you

Cesar

0 Rata Zhang over 5 years ago in reply to Cesar

Expert 2670 points

Thanks,I got it.

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CCS/AWR1843BOOST: The relation between the CFAR threshold and 2D FFT coefficients