In frequency-modulated radar, the instantaneous frequency of the transmitted carrier is varied as in Figure, which is

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In frequency-modulated radar, the instantaneous frequency of the transmitted carrier is varied as in Figure, which is obtained by using a triangular modulating signal. The instantaneous frequency of the received echo signal is shown dashed in Figure, where ? is the round-trip delay time. The transmitted and received echo signal is applied to a mixer, and the difference frequency component is retained. Assume that ?0 ? 0 of the transmitted signal

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