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DCA1000EVM: Clutters in 2D-FFT plots

Part Number: DCA1000EVM

Hello,

I am testing out some chirp/frame/profile design with the DCA1000 board, but I do observe some unusual results (clutter?) in the Doppler plot (2D FFT) when I do the postproc of the acquired frames.

In frame 68 and 70 as below, I do not observe this clutter in my plots:

frame68

frame70

But in frame 69, i can observe this clutter and it affects my other plot generated for the acquired ADC data.

frame69

Is this a known problem? How can I correct for this?

My chirp/frame configuration are as follows:

ar1.ChirpConfig(0, 0, 0, 0, 0, 0, 0, 0, 0, 1)

ar1.ChirpConfig(1, 1, 0, 0, 0, 0, 0, 0, 1, 0)

ar1.ChirpConfig(2, 2, 0, 0, 0, 0, 0, 1, 0, 0)

ar1.FrameConfig(0, 2, 0, 128, 100, 0, 0, 1)

ar1.ProfileConfig(0, 60.5, 100, 25, 69, 0, 0, 0, 0, 0, 0, 50, 1, 256, 6000, 0, 0, 30)

-Tosin