| 摘要 |
PURPOSE:To suppress the reception of beacon radiowaves by a side lobe and reduce the interruption of a video on a display by irradiating beacon radiowaves synchronous to radar pulses only to a main lobe of the radar. CONSTITUTION:The time intervals of a radar pulse are counted by a time counting circuit 15 and said counted value is compared with the counted stored in a memory circuit 17 by a comparator 18. Out of radar pulses outputted from a video amplifier circuit 13, a ladar pulse having a low receiving level and the same frequency as the one stored in the memory circuit 17 is stopped by a stopping gate 19 and the remaining ladar pulses are supplied to a code pulse generating circuit 21 through an OR circuit 20. Transmitting radio waves are modulated by a pulse 21 outputted from the code pulse generating circuit 21 in a transmitting circuit 23. |
