1. Instrumentation and Control Laboratory, Institute of Earth Science, 7000-671 Evora, Portugal
2. Department of Mechatronics Engineering, University of Évora, 7000-671 Evora, Portugal
3. Department of Mobility Design, Escola Superior de Artes e Design, ESAD College, 4460-268 Porto, Portugal
4. Institut de Disseny i Fabricació, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain
5. Instituto de Telecomunicações, 1049-001 Lisbon, Portugal