| 摘要 |
<p>PURPOSE:To remove unnecessary DC components in received signals by supplying a DC voltage signal of a prescribed lelvel into the received signal in the stage of signal transmission prior to a micro-time in the time of transmission. CONSTITUTION:Periodic radio pulses for searching are transmitted and the returned signal reflected from a target is received and amplified. The leading edge of the output of an amplifier circuit 1 thereof is usually held satd. by the reflection from near distances and the leaked radio waves of the transmission pulses to the signal receiving system. Voltage V0 having a level slightly lower by, for example, about 70-90% than the saturation level Vs in the satd. sate is transmitted in a voltage generating circuit 2. The control pulses which continue from before the time T0 of the trigger A2 for transmission of the next period until the time point when the transmission trigger is transmitted are outputted by a timer 3, whereby the circuit 2 and a gate circuit 4 are controlled.</p> |
