Robustness Analysis of Two Advanced Flight Control Laws: NDI and INDI

Abstract

The model-based inverse feedback control method can consider the model and data, and provide a clean control-design framework environment; therefore, baseline control law of all kinds for verifiable aircraft used such methods. In this paper, we carried out the basic mathematical derivation of the two inverse system control methods, nonlinear dynamic inversion (NDI) and incremental nonlinear dynamic inversion (INDI) from nonlinear mathematical theory. We briefly analyzed the similarities and differences in stability and robustness of the two types of control methods in mathematical derivation, and simulated with the landing control law of carrier-based aircraft with two control methods. The results show the INDI compared to NDI have higher robustness, meanwhile, two types of inverse system control methods and conventional control methods can exist in the same design of the control mode, by the authority management, the inverse feedback design method can control the corresponding states of a specific control channel.