hello,i am trying to make a receiver for frequency modulated continous wave radar system and my problem is how i can detect frequncy of mixer output to calculat range of target
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You can do an FFT to the output of the mixer to find the beat frequency. You can then convert beat frequency to the range using the equation associated with FMCW waveform. You can find the equation itself in Skolnik's Introduction to Radar Systems, either 1st or 2nd edition.
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