This paper describes the Variable Speed Control Moment Gyroscope (VSCMG) Workbench, a simulation software tool developed at Georgia Tech. This program will provide the Air Force Research Laboratory (AFRL) with a tool for studying spacecraft control system design for vehicles equipped with VSCMG actuators for combined attitude control and energy storage.

A robust control allocation scheme is developed for rigid spacecraft attitude stabilization in the presence of actuator partial loss fault, actuator failure, and actuator misalignment. First, a neural network fault detection scheme is proposed, Second, an adaptive attitude tracking strategy is employed which can realize fault tolerance control under the actuator partial loss and actuator failur...

The kinematics and dynamics of free-floating manipulators are examined from a fundamental point of view. The dynamic coupling between an uncontrolled spacecraft and its manipulator can make a system dynamically singular at configurations which cannot be predicted by the system’s kinematic properties. Nonholonomic behavior is observed in free-floating systems, and is due to the nonintegrability ...

This paper considers the problem of controlling relative attitude between two spacecrafts, so as to follow a smoothly time varying desired relative attitude trajectory. The spacecrafts are modelled as rigid bodies and attitudes are represented in non-linear state space of SO(3). The attitude control law proposed does not need relative attitude measurement and is determined from line of sight (L...

In spacecraft engineering a paradigm shift is emerging with the tendency from traditional, single, large, and multifunctional satellites towards cooperating, distributed small spacecraft systems. In particular modern miniaturization techniques allow realization of satellites with continuously smaller masses, and thus enable cost-efficient implementation and launch of distributed multi-satellite...

• Attitude control – usually autonomous in satellite missions running in a dedicated processor. Its development and testing requires particular conditions. Its development and testing requires particular conditions. For instance, the gravity and air resistance are variables that overcome the effects which disturb the spacecraft attitude on orbit. For this reason, the use of a set of software sy...

In this paper, we analyze dynamics of a DGVSCMG(Double-Gimbal VariableSpeed Control Moment Gyro) and develop an easy-to-use LPV (Linear ParameterVarying) model, in which we deal with 3-axis attitude control of a spacecraft equipped with a DGVSCMG. Although it is hard to consider overall stability and control performance of attitude control at the same time with conventional methods, this paper ...

This paper presents an adaptive constrained attitude control for uncertain spacecraft. Inspired by the concept of nonsingular terminal sliding mode and funnel nonlinear systems, a novel is introduced which contains time-varying gain to handle constraints imposed on spacecraft attitude. Indeed, when trajectory approaches boundary constraint set, effort as well will increase in order preclude fro...