Reza Mohammadi Asiyabi, Andrei Anghel, National University of Science and Technology POLITEHNICA of Bucharest, Romania; Adrian Focsa, Military Technical Academy Ferdinand I, Romania; Mihai Datcu, National University of Science and Technology POLITEHNICA of Bucharest, Romania; Michele Martone, Paola Rozzoli, German Aerospace Center (DLR), Germany; Ernesto Imbembo, European Space Agency, ESA/ESTEC, Netherlands