AWR2944: Unit of azimuth value

Daisuke Maeda

Guru 20205 points

Part Number: AWR2944

Our customer wants to use the azimuth sample values to display in their software.

Could you tell me the unit of the "azimPeakSample" value?

C:\ti\mmwave_mcuplus_sdk_04_02_00_02\ti\datapath\dpc\dpu\dopplerprocDDMA\src\dopplerprochwaDDMA.c
int32_t DPU_DopplerProcHWA_extractObjectList
azimPeakSample = *(uint16_t *)(&azimFFTMat[(AzimIdxCurr + DopIdxCurr * obj->cfarAzimFFTCfg.numAzimFFTBins)
* obj->cfarAzimFFTCfg.azimFFTIOCfg.output.bytesPerSample]);

The customer guesses the unit of the value to be roughly 1e-3 dB or 2^-10 dB.

Best regards,

Daisuke

over 3 years ago

0 Cesar over 3 years ago

TI__Guru*** 147954 points

Hi,

In the "PING AZIM FFT PARAMSET ", the following is enabled "HWA_FFT_MODE_MAGNITUDE_LOG2_ENABLED;"

Please refer to the HWA section in the 29xx Technical Reference Manual for operation of this mode.

thank you

Cesa

0 Daisuke Maeda over 3 years ago in reply to Cesar

Guru 20205 points

Hi Cesa-san,

Thank you for your reply.

Our customer already uses the "azimPeakSample" value in their GUI software, but they want to know the unit of the value.

Could you tell me the unit of the "azimPeakSample" value?

The customer guesses the unit of the value to be roughly 1e-3 dB or 2^-10 dB.

Best regards,

Daisuke

0 Cesar over 3 years ago in reply to Daisuke Maeda

TI__Guru*** 147954 points

Hi,

I have to assign this thread to another team member. He will be able to tell when he can get back to you

thank you

Cesar

0 Daisuke Maeda over 3 years ago in reply to Cesar

Guru 20205 points

Hi Cesar-san,

Thank you for your support. Our customer is waiting for update.

Is this thread already assigned to another team member?

Please give me an answer as soon as possible. Your prompt reply would be appreciated.

Best regards,

Daisuke

0 Akshay Kumar Chandrasekaran over 3 years ago in reply to Daisuke Maeda

TI__Expert 8275 points

Hi Daisuke-san,

Apologies for the delay. Please give me a day to review this question and get back to you by tomorrow.

Thanks and Regards,

Akshay.

0 Akshay Kumar Chandrasekaran over 3 years ago in reply to Akshay Kumar Chandrasekaran

TI__Expert 8275 points

Hi Daisuke-san,

When I tried running the demo the value I got was like the magnitude of azimuth FFT matrix where the values were as high as 25000-35000. So you could consider this a energy or magnitude of the FFT.

Let me know if you have any qwuestions.

Thanks and Regards,

Akshay.

0 Daisuke Maeda over 3 years ago in reply to Akshay Kumar Chandrasekaran

Guru 20205 points

Hi Akshay-san,

Thank you for your support.

What is the unit of the "azimPeakSample" value?

As an example, in the OOB demo, the units of the Relative Power in the Range Profile are dB.

Our customer guesses the unit of the the "azimPeakSample" value to be roughly 1e-3 dB or 2^-10 dB.

Best regards,

Daisuke

+1 Akshay Kumar Chandrasekaran over 3 years ago in reply to Daisuke Maeda

TI__Expert 8275 points

Hi Daisuke-san,

Thanks for your patience. Unit of the the "azimPeakSample"(16-bit number) is in dB scale with 10bits for fractional part and 6-bits for non fractional part.

Let us know if you have any questions.

Regards,

Akshay.

0 Daisuke Maeda over 3 years ago in reply to Akshay Kumar Chandrasekaran

Guru 20205 points

Hi Akshay-san,

Thank you for your reply.

I understand that the unit of "azimPeakSample" is dB, and the value is a 16-bit fixed point with a 6-bit integer part and a 10-bit fractional part.

Best regards,

Daisuke

0 Akshay Kumar Chandrasekaran over 3 years ago in reply to Daisuke Maeda

TI__Expert 8275 points

Hi Daisuke-san,

If you have no other questions, can I close this ticket.

Thanks and Regards,

Akshay.

0 Daisuke Maeda over 3 years ago in reply to Akshay Kumar Chandrasekaran

Guru 20205 points

Hi Akshay-san,

Thank you for your reply.

Let me confirm to make sure.

The 6-bit integer part is unsigned, right?

Best regards,

Daisuke

+1 Akshay Kumar Chandrasekaran over 3 years ago in reply to Daisuke Maeda

TI__Expert 8275 points

Hi Daisuke-san,

Yes right 6-bit integer part is unsigned.

Let us know if you have any questions.

Thanks and Regards,

Akshay.

0 Daisuke Maeda over 3 years ago in reply to Akshay Kumar Chandrasekaran

Guru 20205 points

Hi Akshay-san,

Thank you for your reply.

Best regards,

Daisuke

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AWR2944: Unit of azimuth value