Abstract: Ageneralnonsmoothtrajectoryoptimizationapproachwaspresented.Themeshrefinementprocedurebasedondatacompressondyadicgridswasimprovedtoincreasetheefficiency,usabilityandflexibility,andwasthencombinedwiththelocalcollocationmethodwhichtookadvantageofscaling,sparsityanddifferentnumericaldifferentiationofnonlinearprogramming(NLP).NumericalsimulationonEarth-to-Marstransferorbitoptimizationdemonstratesthattheapproachcapturesnonsmoothregionsexactlywithdensitymeshandhasthepotentialofon-boardoptimization.Furthermore,theapproachcapturesnon-smoothregionsofstateseventhoughthemeshisrefinedaccordingtothecontrolvariables.ForEarth-to-Marstransferorbitoptimization,itisbettertodefinethethrustanglein[0,360°)thanthatin[-180°,180°).

Key words: Collocationmethod, Meshrefinement, Earth-to-Marstransferorbit