Microprocessor-Based Nonlinear Controller for the Roll Motion of a Model Aircraft

The use of a microprocessor to control the roll motion of a model aircraft for wind tunnel experimentation is presented. A nonlinear model for the plant dynamics is employed. The controller is implemented as a non-linear control algorithm resulting in a stepwise control signal. The proposed controller is capable of handling efficiently rather fast varying disturbances which would be detrimental in the preservation of stability. To reduce the computation time in the microprocessor unit, a 3-byte fixed point arithmetic has been employed.

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