| 摘要 |
PURPOSE:To improve judging accuracy while simplifying circuitry by arranging a performance monitoring body to judge the lowering of the radar performance only in the transmission system while the video signal processing section handles the judgement in the receiving system. CONSTITUTION:In a performance monitoring body, a part of transmitted pulses are received with a monitor antenna 1 and sent to a detector 4. The detection signals are compared by 4-level comparator and a modulated signal V(t) and a monitor triggering signal MT are generated with a modulated signal generation circuit 9 by trigger signal TR. A microwave modulated in the frequency with the signal V(t) is emitted from the monitor antenna 1 via first and second variable attenuator 11 and 12. Then, in the video signal processing section, the monitor trigger signal MT generated in the performance monitoring body is passed through a binary counter/decoder 101 and an NAND circuit 102 to obtain a signal NS. An output signal given after comparison with the signal level of the microwave emitted from the monitor antenna 1 of the monitoring body and the signal NS are sent to a switching circuit 107. |
