Abstract
This paper deals with the problem of output tracking for a missile axis autopilot. For a small number of plant linearizations across the missile's operating domain, linear output feedback controllers are first designed using H∞ optimization with pole placement constraints: these controllers incorporate integral action while maintaining the eigenvalues of the closed loop system in a convex LMI region. The controllers are afterwards converted to observer based ones using Youla parameterization and their gains are scheduled, providing a nonlinear controller to cover the entire operating domain. To complete such a nonlinear control scheme, an open loop control using only output reference information is added, along with a feedforward controller to reduce output overshoot while tracking reference signals.
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