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Original question:

IWR1443: A very strong false target is always exsiting in the Range 0

DCA1000EVM: How to eliminate DC Range component when capturing data with DCA1000EVM

William Gao
Intellectual 630 points
Part Number: DCA1000EVM

I know that there will be DC range component in range FFT output because of the Antenna coupling signature. However, in the field tests, the DC range componenet is not always present. Sometimes, the range components around  DC are very small and sometimes they are very small (can be neglected). Does this kind of DC component has the probability to come up? In this way, when the range components are very big, the power of target seems to be suppressed because of the limited transmitted power.

So my question is how to make the DC range component small when capturing data. I know there is signal processing way to calibrate DC range, but I really want to elimate Dc range component prior to signal processing. 

Thanks!

William

  • 0
    TI__Guru 58035 points
    Hello William,
    The antenna coupling signature should not change from time to time, it should be almost fixed. The "DC" signal could also be because of a other very strong object very close to the sensor depending on the chirp configuration.
    Typically the DC component is not an issue since the objects of interest are in further bins (beyond the DC) and the DC bins can be ignored. What is the reason you wish to eliminate it ?

    Regards,
    Vivek