Constraints of open-loop crossover frequency with autopilot design for canard-controlled missiles

Abstract

The pole assignment method is commonly used in the design of three-loop autopilot, and the constraints for the key parameter that the open-loop crossover frequency was blurred. By concluding the analytical relationship between control gains, the close-loop poles and the open-loop crossover frequency, the control system design problem is transformed into a judicious choice of the open-loop crossover frequency. Combined with engineering experience of the Canard layout missile, the constraint criteria and modified methods for the selection of the open-loop crossover frequency of the rudder bandwidth, the fin rate, the close-loop zeros and the gain polarity are discussed. The applicability of the criteria is verified in typical conditions.

Keywords

• pseudo angle of feedback|three-loop autopilot|pole placement|open-loop crossover frequency|gain polarity