This paper presents mainly parameter selection characteristic of autopilot and effect to flight quality of aircraft, after a basic configuration of fixed gain control augmentation system is shown.

文中在给出了固定增益的控制增稳系统的基本组成之后，着重介绍自动驾驶仪的参数选择特点及其对飞机飞行品质的影响。

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The stability of a nonlinear control system which consists of a sector bounded nonlinear gain in cascade with a fixed linear PID controller is analyzed using Popov stability criterion.

针对一类由非线性增益函数与典型PID控制器级联组成的非线性系统，采用波波夫判据对此类闭环控制系统进行稳定性分析。

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