富里叶变换 PW PW Transmitter Receiver PW=10~50μS T=4s Freq.range 2=200,000~400,000Hz -0.25Hz 2024/9/20 页下2024/9/20 富里叶变换 Pw 1  T 1 T PW PW Transmitter Receiver PW=10~50μs T=4s Freq.range P W 1 2 =200,000~400,000Hz T 1 =4 1 =0.25Hz