1. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, University of Lisbon, Avenida Rovisco Pais 1, 1049-001 Lisbon, Portugal
2. SERCO/ESRIN, Largo Galileo Galilei, I-00044 Frascati, Italy
3. European Space Agency-ESRIN, Largo Galileo Galilei, I-00044 Frascati, Italy