The Inertial Stellar Compass (ISC) is a miniature, low power, stellar inertial attitude determination system with an accuracy of better than 0.1o (1 sigma) in three axes. The ISC consumes only 3.5 Watts of power and is contained in a 2.5 kg package. With its embedded onboard processor, the ISC provides attitude quaternion information and has Lost-in-Space (LIS) initialization capability. The at...

Using direction vectors of unit length as measurements for attitude estimation in an extended Kalman filter inevitably results in a singular measurement covariance matrix. Singularity of the measurement covariance means no noise is present in one component of the measurement. Unit vector measurements have no noise in the radial component. Singular measurement covariances can be dealt with by th...

Neural networks offer a unique approach to controlling a dynamically changing system. By updating synaptic weights of an interconnected, algebraic framework, desired system objectives can be reached despite an unknown operating environment. This research implements a neural network for controlling the attitude of a satellite with unknown system disturbances. The training and updating of the con...

This paper aims to develop a novel attitude determination system aided by polarization sensor. An improved heading angle function is derived using the perpendicular relationship between directions of E-vector of linearly polarized light and solar vector in the atmospheric polarization distribution model. The Extended Kalman filter (EKF) with quaternion differential equation as a dynamic model i...

| An adaptive control law for the end-e ector tracking problem of underwater vehicle-manipulator systems is presented in this paper. By exploiting the serialchain multibody mechanical structure, the overall control problem is decomposed in a set of elementary control problems, each of them formulated with respect to a single rigid body in the system. The proposed approach results in a modular c...

Abstract This paper focuses on the attitude control problems of spacecraft with external interference and platform actuator failure. The Lagrange method is used to establish dynamic models complex composed rotating appendages platform, quaternion describe kinematics. Second, a fault-tolerant algorithm that combined adaptive fuzzy finite time sliding mode proposed for fixed-time schemes are part...

This paper deals with the attitude tracking control problem of rigid satellite uncertainties disturbances. An adaptive proportional derivative controller (PD) is proposed to deal influence external disturbance in controller. The uncertain disturbances can be estimated through an algorithm and compensated error closed-loop system stability are ensured based on Lyapunov analysis. using representa...