FREQUENCY CONTROL SYSTEM FOR FREQUENCY AGILITY RADAR

摘要

PURPOSE:To realize a frequency agility radar small in the pulse width by constructing an AFC circuit with the combination of a closed loop system and an open loop system. CONSTITUTION:A sample hold circuit 10 acts as AFC of a closed loop system as a switch 16 opens immediately before the circuit is closed starting from the presetting of a voltage control oscillator VCO6. Then, upon the closing of the sample hold circuit 15, the switch 16 is closed and the output voltage of a discriminator 8 is amplified with an amplifier 14 to be an input voltage of the oscillator VCO6. Since this voltage is in the linear area of the discriminator 8, the action of the open loop system serves to improve the accuracy of the control in the closed loop. Thus, this AFC circuit can improve the accuracy of the frequency control in a frequency agility radar small in the pulse width.