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.