IWRL6432BOOST: Issue with velocity resolution for lsdk in mmwave estimator app

Aditya Shah

Part Number: IWRL6432BOOST

Tool/software:

Hi,
I am using https://dev.ti.com/gallery/view/mmwave/mmWaveSensingEstimator/ver/2.5.0/ and seeing tooptip info for this enitity formula.

But the app backend code is as follows:

if (frameCfg5_NumOfBurstsInFrame > 1) {
// should be dividing by number of chirps per Tx
return ((2 * results_maxVelocity) / (frameCfg5_NumOfBurstsInFrame / deviceBoardParam_numTxAntennas));
}
else {
// We do not care about total # of chirps, just # of chirps per Tx
return ((2 * results_maxVelocity) / chirpParam_numChirpLoops);

That division by numTXAntennas was not there in tooltip also in java code for earlier mmwave estimator app code.

Can you confirm which is the correct formulation used?

4 months ago

0 Nathan Block 4 months ago

TI__Mastermind 37805 points

Hi,

This is a bug. Revert to sensing estimator version 2.4.1 for the right result.

https://dev.ti.com/gallery/view/mmwave/mmWaveSensingEstimator/ver/2.4.1/

Best,

Nate

0 Aditya Shah 4 months ago in reply to Nathan Block

Intellectual 390 points

Hi Nathan Block
Thanks for the response.

But in 2.4.1 also, I see "/ deviceBoardParam_numTxAntennas" for NumOfBurstsInFrame =1 case, and tooltip doesn't show this.

Can you confirm if this backend code is correct?

earlier, I saw it was like this as shown below:

NumOfBurstsInFrame ==1 case:

RangeRateResolution = (2* radarParams.MaximumRangeRate)/(frameCfg(end).NumOfBurstsInFrame);

NumOfBurstsInFrame ==1 case:

RangeRateResolution = (2* radarParams.MaximumRangeRate)/(frameCfg(end).NumOfChirpsInBurst*frameCfg(end).NumOfBurstsInFrame);

0 Nathan Block 4 months ago in reply to Aditya Shah

TI__Mastermind 37805 points

The backend code is right because when numBursts in frame is 1 and numTX antennas is 2, then we only get half of the total chirps for velocity measurement because they're shared across 2 TX antennas.

Best,

Nate

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IWRL6432BOOST: Issue with velocity resolution for lsdk in mmwave estimator app