Linux/IWR1443BOOST: Interpreting data (Log magnitude Range and Doppler Heatmap)

Daniel L.

Part Number: IWR1443BOOST

Tool/software: Linux

I have a doubt about how to handle the data from the IWR1443Boost. I am using SDK 2.1 and ES 3.0.

I have managed to get the log magnitude range and range doppler heat map data coming from the IWR1443Boost by modifying the ti mmwave ros package and the config.cfg.

From what I have read on the doxygen of the sdk, I realized that the data comes as uint16_t, and that is how I have stored the data.

However, on the documentation it says also that the log magnitude range is in the Q9 format. Does that mean that I have to rearrange the data that comes in 16 bits to sequences of 10 bits each and then convert it from Qformat? I have uploaded a picture of my log magnitude range using the 16 bits without doing the conversion. Could you also inform me if that is a reasonable result ?

Best Regards,

Daniel

over 6 years ago

0 Nitin Sakhuja over 6 years ago

TI__Mastermind 30405 points

Hello Daniel,

However, on the documentation it says also that the log magnitude range is in the Q9 format. Does that mean that I have to rearrange the data that comes in 16 bits to sequences of 10 bits each and then convert it from Qformat?

No, the above means that you should interpret each 16-bit value as Q9 format.

Regards

-Nitin

0 Daniel L. over 6 years ago in reply to Nitin Sakhuja

Prodigy 140 points

Hi Nitin,
Thank you very much.

Does that mean that if I want to convert the integer value that is read as uint16 into power in dB, I should do as follows:
P[db] = 20 * log10( 2.^(logMagRange/2^9) ); where logMagRange is each "sample" uint16. Would that be correct?

Cheers,
Daniel

0 Nitin Sakhuja over 6 years ago in reply to Daniel L.

TI__Mastermind 30405 points

Hi Daniel,

Yes, this is correct.

Thanks

-Nitin

Sensors

Sensors forum

Linux/IWR1443BOOST: Interpreting data (Log magnitude Range and Doppler Heatmap)