Dittus, HansjörgSagliano, MarcoMarcoSagliano2020-03-092020-03-092016-01-22https://media.suub.uni-bremen.de/handle/elib/1008While Europe has done tremendous steps forward in many aspects of space technology, there is still a gap for what regards the development of the technologies for a safe and reliable atmospheric entry. Several US-based programs such as NASA s Orion, SpaceX s Dragon, and Sierra Nevada Corporation s Dream Chaser show that this capability is essential for a fruitful and safe access to space. In this thesis a dual strategy is proposed. In what we call main guidance, novel methods based on optimal control, adaptive trajectory generation, and sliding-mode control, are developed and tested. In what we call backup guidance, a traditional drag-tracking method is applied to the SHEFEX-3 scenario. Some of the hypotheses usually valid for other scenarios, are here rejected. For this reason, the method developed for SHEFEX-3 can be seen as a generalization of the traditional methods used for entry guidance of vehicles like the Space Shuttle or the IXV.enAlle Rechte vorbehaltenEntry guidancepseudospectral methodsoptimal controlsliding mode controldrag tracking control600 Technik, Medizin, angewandte Wissenschaften::620 IngenieurwissenschaftenDissertationurn:nbn:de:gbv:46-00105082-13