1. CESVIMAP, 05004 Ávila, Spain
2. Department of Signal Theory, Telematics, and Computer Science, Rey Juan Carlos University (URJC), 28942 Fuenlabrada, Spain
3. Department of Systems Engineering and Automation, Universidad Carlos III de Madrid (UC3M), 28911 Leganes, Spain
4. Research Group Smart Sensor Systems, The Hague University of Applied Sciences, 2628 AL Delft, The Netherlands