Antennas 5 Quad rotors Unmanned aerial vehicles (UAV) 5 Adaptation 3 Adaptive control systems 3 Admittance force feedback control 3 Approach system 3 Collaborative control 3 Collaborative transportation 3 Contact forces 3 Controllers 3 Feedback control 3 Force feedback control 3 Global positioning system 3 Object transportation 3 Trajectories 3 Transportation system 3 adaptation 3 admittance force feedback control 3 collaborative transportation 3 unmanned aerial vehicles 3 ASV 1 Aerial robotics 1 Aircraft detection 1 Autonomous landing 1 Computer vision 1 Disturbance observer 1 Finite-time convergence 1 Finite-time tracking control 1 Landing 1