AWRL6844: Inquiry about simultaneous use of cyclic CFAR and clutter removal

Kazu

Part Number: AWRL6844
Other Parts Discussed in Thread: AWRL6432

Tool/software:

Hello team,

I would like to confirm whether it is possible to use cyclic CFAR together with clutter removal.

Specifically, since enabling clutter removal reduces the number of Doppler bins by 1, causing the number of cells under test to no longer be a power of two, can cyclic CFAR still be used in this situation?

    /* clutter removal is implemented by zeroing the first Doppler bin */
    if(gMmwMssMCB.staticClutterRemovalEnable)
    {
        params->numDopplerBins = params->numDopplerBins - 1;
    }

Could you please clarify if cyclic CFAR and clutter removal can be enabled simultaneously, or if there are any limitations or workarounds?

Thank you for your support.

Best regards,
Kazu

3 months ago

+1 zigang Yang 3 months ago

TI__Mastermind 40335 points

Hi, Kazu:

Good question and yes, the HWA CFAR cyclic mode does need power of 2.

One way is to change the clutter removal method. Instead of remove zero Doppler bins, you can use DC estimation and subtract from the signal. We have such an implementation in in-cabin demo located at:

radarToolboxFolder\source\ti\examples\Automotive_InCabin_Security_and_Safety\AWRL6432_Life_Presence_Detection_Demo_Capon2D\src\xwrl6432\datapath\dpu\doaproc

function: doaProc_configHwa_fft

The first two paramSet is used for DC estimation and DC subtraction.

Hope it is helpful.

Best,

Zigang

0 Kazu 3 months ago in reply to zigang Yang

Prodigy 100 points

Hi Zigang,

Thank you very much for your detailed explanation and helpful suggestion.

I will use DC estimation and subtract it from the signal instead of removing zero Doppler bins.

I appreciate your support.

Best regards,

Kazu

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AWRL6844: Inquiry about simultaneous use of cyclic CFAR and clutter removal