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IWR1642: Signal quality issue: why are there peaks in the whole doppler bins?

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Part Number:IWR1642

I take IWR1642 outdoor tests and find some signal quality issue, please see the pictures below.

parameters: PRT = 27us, idle time 2us, adc st time 4us, sampling rate 6.25Msps, ramp time 25us, tx st time 0us, slope rate 5.5MHz/us, AGC gain 36

I found peaks across the doppler dimension, and it varies between different antennas. It seems RF problem, but I don't know why.


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