系统中采用锁相环路控制视频同步。
PLL circuit is adopted in order to control video signal synchronization.
内环路控制，对于自动驾驶仪操作，这是无关飞行航道的飞机俯仰姿态和坡度的基本控制。
INNER LOOP control, For autopilot operation this is the basis control of airplane pitch and roll attitude without regard to flight path.
在电路设计上，根据环路传递函数的特征，利用简单的电压模式控制和基本的PI补偿器，保证了宽带环路控制的稳定性。
According to the characteristic of the control loop, simple voltage control mode and basic PI compensation are employed to ensure the stability of the converter.
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