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AWR1642BOOST: HeatMap data(detMatrix) - Range-Doppler Power Value

Kevin Chan
Prodigy 50 points
Part Number: AWR1642BOOST

Hi, 

I dumped R-V HeatMap data and found that the resulting one has a line-shaped noise.     

I set PROFILE_SRR_START_FREQ_GHZ as 79G.  Please refer to the following figure(X label is Range Index, Y label is Doppler Index)

 

Figure 1 : 79G

However, when I set PROFILE_SRR_START_FREQ_GHZ to 77G, 78G and 80G, those results look normal.

Please refer to Figure 2-4 (X label is Range Index, Y label is Doppler Index)

Figure 2 : 77G

Figure 3 : 78G

Figure 4 : 80G

 

This thing has been bothering me for a long time. Do you have any suggestion for profile setting or possible causes for this problem.

Thank in advanced.

Best Regards,

Kevin Chan

  • 0
    TI__Expert 7215 points
    Hi Kevin,

    This is a known Issue as mentioned in the device Errata (ANA#08).
    www.ti.com/.../swrz072a.pdf

    Please avoid 79.2Ghz Frequency during chirp or Have large slope as a workaround.

    Regards,
    Kaushal
  • 0 in reply to Kaushal Kukkar
    Prodigy 50 points
    Hi Kaushal,

    Thank you very much for this information. It helps me a lot.
    I read this document you mentioned, and found issue ANA#08. But I am not sure what exactly will happen when I set settings as ANA#08.
    Could you give me the ANA#08 settings so that I could reproduce and where can I observe doppler spur?
    Moreover, could you explain why this nonlinearity of the synthesizer causes doppler spur when crossing 79.2 GHz?


    Best Regards,

    Kevin