1. Department of Robotics and Mechatronics; AGH University of Science and Technology; ul. Mieckiewica 30 30059 Krakow Poland
2. Robotics and Mechatronics Center; German Aerospace Center (DLR); Münchner Str. 20 82234 Weßling Germany
3. Institute of Space Systems; German Aerospace Center (DLR); Robert Hooke Str. 7 28359 Bremen Germany