PURPOSE: To obtain an improved method for detecting the interference of pulses received by a secondary radar.
CONSTITUTION: A signal LogΣ(t) brought about by a total channel and log amplifier is added to a sampling circuit 31, and The output of the sampling circuit 31 is connected to the main input of a memory device 33 and negative input of a subtracter. The output of the memory device 33 is connected to the positive input of the subtracter. The sampling circuit 31 works to allow oscillation to be sampled within a pulse logΣ(t) at a plurality of points. Values sampled are, e.g. stored in a storing device 33. The subtracter 35 enables detection of existence of a ripple within the pulse LogΣ(t) by the difference between the sampled value stored in the memory device 33 and the output value of the sampling circuit 31, so the output of the subtraction 35 is connected to a first circuit 38 for generating a grade and stable state in received pulses.
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