A. P. Aguiar†,
R. Ghabcheloo†, A. Pascoal†, C. Silvestre†, J. Hespanha‡, and I. Kaminer¶, †Institute
for Systems and Robotics, Instituto Superior Técnico, Portugal, ‡University
of California, Santa Barbara, USA, ¶Naval
Postgraduate School, Monterey, CA