Method for distinguishing aircraft motion mode

The invention provides a method for distinguishing an aircraft motion mode. The method is characterized by comprising the steps that a response, input by a driver, of an aircraft which is represented by an aircraft motion mode and flying quality characteristic high-order system and provided with a complex control augmentation stability system is similar to a response of a non-augmentation aircraft, and the driver can recognize the response of the aircraft through a low-order system familiar to the driver; the system is described through a continuous domain equivalent low-order system transfer function, as for a linear time invariant system, a continuous type transfer function is converted into a discrete type pulse transfer function through a bilinear transformation formula, a distinguished discrete model coefficient is converted into a continuous model coefficient, and then the continuous model coefficient is converted into an aircraft motion mode and flying quality parameter; step change and pulse responding are carried out on a two-level equivalent system with a distinguished aircraft longitudinal short-period motion mode, and it can be seen that the two-level equivalent system obtained after distinguishing is stable in response under different inputs through a simulation result.