| 摘要 |
<p>PURPOSE:To prevent malfunction by receiving an external interference wave without radiating a radio wave until prescribed requirements are satisfied, and then setting the oscillation frequency of a transmitter in a frequency range free of a interference wave. CONSTITUTION:When a guided missile is launched, a transmitter 6 outputs a transmitted signal at an adequate point in time. At this time, prescribed requirements are not satisfied, so the radio wave from an antenna 4 is not radiated and an external interferende wave is received by the antenna 4. When the interference wave has a certain level or above, the transmitter 6 increases or decreases a frequency. Then, when the prescribed requirements are satisfied, a switch 8 is turned on to radiate the radio wave from the antenna 4, and when a target enters into the beam of the antenna 4, a reflected signal shifted by the Doppler effect is received. This received signal is inputted to a duplexer 9, a mixer 10 and a detector 12 and when the Doppler signal exceeds a threshold value, a triggering circuit 13 is actuated to send a trigger signal to a missile warhead 15 through a safety device 14.</p> |
