1. Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL, USA
2. Department of Electronic and Electrical Engineering, University College London, London, U.K.
3. Fraunhofer FKIE, Wachtberg, Germany
4. AFRL/RYAR, Wright-Patterson AFB, OH, USA
5. Dipartimento di Ingegneria dell'Informazione, Universita’ di Pisa Via Caruso, Pisa, Italy
6. Metron, Reston, VA, USA