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DCA1000EVM: Sporadically observing some negative range components after processing IQ data.

Part Number: DCA1000EVM
Other Parts Discussed in Thread: IWR1642BOOST

Tool/software:

Hi, 

I am sporadically seeing some negative range components after processing IQ data. Please see the image (Unexpected response image) below. You can see some sort of mirror image in the negative range area. I am using TI IWR1642BOOST and DCA1000EVM for the capture. 

This is always not the case. Sometimes the same script gives the correct response

(In the images below images Y axis is range, x is doppler/angle)

Unexpected response

 

Expected response 

Could you please help us understand why this could be happening. 

Thank you 

Regards

Gayatri