Multi-Axis Compensation Strategy for Achieving Velocity Vector Roll

Achieving velocity vector roll is a critical requirement in advanced aircraft control design. This paper utilizes Differential PI scheme as baseline controller, where lateral-directional and longitudinal controllers are designed in stability and body axes, respectively. Since linear aircraft models are used for control design, the controller fails to achieve design performances when used in nonlinear Six-DoF aircraft dynamics. Hence, a compensation strategy is presented to achieve the desired performance. Due to the multi-axis control design, compensation terms appear in different aircraft frames, requiring extreme care in their implementation. The efficacy of the proposed scheme is shown through comprehensive simulations.