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IWR1443BOOST: What is the phase stability of the different receiving antennas

Part Number: IWR1443BOOST

Tool/software:

I used the radar to measure the corner reflector, and measured it for three consecutive days, and they showed different waveforms, which showed that they had different upward and downward trends, the change trend of RX1 and RX2 was the same, and the change trend of RX3 and RX4 was consistent, which was manifested in the first day, RX1 and RX2 were rising and falling, but RX3 and RX4 had no downward trend, and the change was relatively flat. Does this have anything to do with their long-term stability?

tongxin.