| 摘要 |
PURPOSE:To prevent the lock-off of a guiding device of a flying object, by switching a signal discriminating circuit and a filter circuit to those of a wide band respectively when a semiactive homing guidance to an active homing guidance. CONSTITUTION:The frequency is converted by mixers 3 and 4 for the reflection signal (a) and irradiation signal (b) which are given from a target. These signals are then mixed by a mixer 8 to produce a video signal, and this video signal receives again a conversion of frequency through a signal detecting circuit 18 to follow up the signal in the form of a narrow band AFC 1oop. Then the semiactive homing guidance is switched to the active homing guidance by he semiactive/active switch signal (c). In this case, a signal discriminating circuit 16 that converts the tracking signal of the circuit 18 into the DC voltage and a filter circuit 17 that limits the signal tracking band are switched to wide band circuits 35 and 36 by a band switching circuit 33. As a result, the locking mode can be held for the circuit 18 even in the active homing mode. |
