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The existing results on the leader-following attitude consensus for multiple rigid spacecraft systems assume that all the parameters of the spacecraft systems are known exactly and the information flow among the followers is bidirectional. In this paper, we remove these two assumptions. First, by introducing a new Lyapunov function, we allow the(More)
In this paper, we consider the leader-following consensus problem for multiple uncertain rigid spacecraft systems with the attitude being represented by unit quaternion. Existing results on this problem rely on the assumption that all parameters of the rigid spacecraft system are known exactly. By employing a nonlinear distributed observer for the leader(More)
A novel highly birefringent photonic crystal fiber (PCF) based on an octagonal structures with isosceles triangular-latticed cladding is proposed. Using a full-vector finite element method (FEM) simulator (COMSOL Multiphysics), we study the modal birefringence of the fundamental modes with different parameters in such PCFs. In addition, the proposed(More)
In this paper, a novel consensus-based distributed nonlinear hierarchical control approach is proposed for frequency and voltage regulation of an islanded AC microgrid under switching communication network. It is proved that the proposed control approach is robust against unreliable communication links as long as the switching graph associated with the(More)