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A new approach for designing multirate digital flight control systems based on optimal control theory is described. The error rejection properties of control systems designed by the, new technique are investigated through a case study. The example considered is the F-14 aircraft controlled by a multirate proportional-plusintegral controller. The aircraft/controller system is "flown" through a turbulent atmosphere; a covariance analysis of state variable errors determines the ability of the controller to reject turbulence-induced errors. The controller sample rate and control sequence are varied to determine their influence on the disturbance rejection properties of the controller. Finally, a sample rate optimization scheme based on performance/computation tradeoff is presented.

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