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IWR6843AOP: question regarding the Antenna Coupling Signature Removal

Piao DENG
Prodigy 190 points
Part Number: IWR6843AOP

Hi,

thanks for looking into my question.

I noticed that in the range-FFT results, there is some peaks near the DC:

I am wondering whether is the is Antenna Coupling Signature mentioned in the SDK document.

It seems that the Antenna Coupling Signature Removal in the OOB is done after every power up. I noticed from my results that the phase and amplidtude of these peaks is constant after one power up. But if the radar is power cycled, the phase and amplitude of these peaks changes. I am wondering whether there is a method to do the calibration once and record the value in FLASH, whcih can be used in later measurements. Since my application need to power cycle the radar to save power and detect some object within 50 mm range.

thanks!