Abstract
A sliding mode state and perturbation observer is used in conjunction with a feedback linearizing drag tracking law for application to entry guidance. The observer estimates the drag and drag rate required by the tracking law and estimates the modeling error in the drag dynamics. The modeling error estimate is used in the drag tracking law to more exactly cancel the nonlinearities; thus rendering the drag tracking adaptive to o-nominal conditions. Mars entry simulations for a capsule-type lander are carried out to assess and compare the performance of the adaptive tracking law relative to straight feedback linearizing tracking law. The results show that the adaptive drag tracking guidance oers performance improvement.
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