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在分析非线性系统时，描述函数作为一种古典的频域方法，具有许多优点。描述函数分析准则的修正赋予描述函数理论新的内涵，并为挠性航天器非线性喷嘴控制系统设计分析提供了一种有效手段，以谐波描述函数理论为基础，探讨了脉冲调制器描述函数的区域线性化，并对挠性航天器的姿态控制系统进行设计、分析，使航天器的姿态控制系统满足稳定性、控制精度等性能，并具有一定的鲁棒稳定性。
Describing the function as a classical frequency-domain method has many advantages when analyzing nonlinear systems. Modifying the criterion of function analysis gives a new connotation of describing the function theory and provides an effective method for designing and analyzing the nonlinear nozzle control system of the flexible spacecraft. Based on the harmonic description function theory, the pulse modulator description function The attitude control system of the flexible spacecraft is designed and analyzed so that the attitude control system of the spacecraft meets the requirements of stability and control accuracy and has some robust stability.