Method for analyzing angular motion characteristics of double-spinning projectile under geometric nonlinearity

The invention discloses a method for analyzing angular motion characteristics of a double-spinning projectile under geometric nonlinearity. The method comprises the following steps: step 1, establishing a nonlinear angular motion equation of the double-spinning projectile about an attack angle alpha, a sideslip angle beta, a pitch angle speed omega z and a yaw angle speed omega y; 2, taking a pitching rudder deflection angle delta z and a yawing rudder deflection angle delta y as parameters, and determining a Jacobian matrix of the angular motion system corresponding to the nonlinear angular motion equation established in the step 1 in a balanced state; 3, determining the necessary and sufficient conditions of the angular motion system in a stable balance state; 4, determining boundary conditions required to be met by the deflection angle of the yawing rudder when the angular motion system is stable; and 5, carrying out dimension reduction processing on the angular motion system, and determining motion charac