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IWR6843ISK: 距离剖面图纵坐标问题

Part Number: IWR6843ISK

我发现1DFFT后的纵坐标数值非常大,请问这代表了信号振幅还是功率?

在距离FFT后,我应该如何得到峰值对应频率的振幅呢?