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In a frequency modulated radar the instantaneous frequency of the transmitted carrier is varied as in Fig 4 18 Such a signal is generated by frequency modulation with a periodic triangular

In a frequency-modulated radar the instantaneous frequency of the transmitted carrier is varied as in Fig. 4.18. Such a signal is generated by frequency modulation with a periodic triangular modulating wave. The instantaneous frequency of the received echo signal is shown dashed in Fig. 4.18 where τ is the round-trip delay time. The transmitted and received echo signals are applied to a mixer, and the difference frequency component is retained. Assuming that  for all τ, determine the number of beat cycles at the mixer output, averaged over one second, in terms of the peak deviation ∆f of the carrier frequency, the delay and the repetition frequency fof the transmitted signal. (The beat refers to a signal whose frequency is the difference between the frequencies of the two input signals.)

 

 

 
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Jul 31 2020 View more View Less

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