| 摘要 |
<p>PURPOSE:To judge whether the radio wave signal from a frequency diversity radar is received before a predetermined detailed analytical processing, by providing a simultaneous input signal detection circuit and the counter counting the output from said circuit. CONSTITUTION:A simultaneous input detection circuit 10 is constituted of a large number of AND circuits 10a and one OR circuit 10b. Each circuit 10a inputs the quantizing signal at every two channels from the channel selection circuit 4 connected to an output line 7 and outputs a signal '1' when a radio wave signal is simultaneously inputted to two frequency channels and outputs a signal '0' when said radio wave is not inputted. The OR circuit 10b outputs a simultaneous input signal '1' when either one of the circuits 10 outputs a signal '1'. A counter 11 counts the output from the circuit 10, that is, the simultaneous input signal '1' and an output line 12 outputs a count result. On the basis of this count value, the presence of possibility of previously receiving a radio wave signal from frequency diviersity radar is judged.</p> |
