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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)
The leader-following consensus problem of multiple uncertain Euler-Lagrange systems under switching network topology was studied using the distributed observer approach in one of our recent papers. However, the distributed observer in that paper assumed that all the followers knew the system matrix of the leader system. In this paper, we first propose a(More)