Balancing rudder deflection angle determining method applicable to reentry vehicle with multiple rudder surfaces

The invention provides a balancing rudder deflection angle determining method applicable to a reentry vehicle with multiple rudder surfaces. The method comprises the following steps: converting a reentry vehicle balancing rudder deflection angle calculation problem into a nonlinear equation solving problem based on a pneumatic database; establishing a nonlinear equation related to a virtual rudder deflection angle of the reentry vehicle based on a reentry vehicle control channel equivalent virtual rudder deflection angle concept; performing Taylor expansion approximation to obtain a linear equation set for balancing calculation; finally realizing calculation on the balancing rudder deflection angle of the reentry vehicle with multiple rudder surfaces by virtue of a discrete Newton iteration algorithm and a graded balancing strategy. According to the method, a rudder surface function combination method and a graded balancing strategy are applied, so that the method is applicable to the balancing calculation for multiple channels of the reentry vehicle with multiple rudder surfaces, and rudder surface cross-linked coupling influence can be considered. The method is a rapid, high-precise and universal calculation method which is applicable to balancing of multiple channels and is designed for the reentry vehicle with multiple rudder surfaces, and also can be applied to a common airplane and a conventional aircraft.