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IWR6843: 关于Introduction to mmwave Sensing FMCW Radars 解释文档中的问题

Part Number: IWR6843

 在解释雷达的最大检测距离时,提到if信号的频率由adc的采样率Fs限制,图中给出了最大的if信号频率,并给出adc采样频率需要大于这个最大的信号频率,但是按照奈奎斯特采样定理,要能够复原信号,不是应该使得采样频率大于等于2倍的最大信号频率吗?