This paper discusses the influence of aerodynamic drag torque on the dynamics of a satellite in a very low altitude orbit. The larger atmospheric density in low altitude earth orbits results in significant aerodynamic drag torques acting on the satellite. With a conventional satellite design this may result in instability. This paper shows how the instability can be avoided, and how the aerodyn...

With a goal to investigate the dynamics of online persuasion, this research extends the Elaboration Likelihood Model to determine the relative effects of argument quality as a central route to influence attitude change versus design elements (specifically image appeal, navigation design, and connectedness) as peripheral route cues to attitude change. Results emanating from this research are bas...

When a robot arm(s) conducts some tasks on a satellite, the satellite attitude stability is necessary against the robot arm's motion to maintain the communication link and to generate electrical power from the solar panel(s). However the reaction from the robot arm is much stronger than the natural environmental disturbance torque that the traditional satellite attitude control system cares. Na...

A new navigation system for small size Remotely Piloted Aircraft Systems (RPAS) is presented, which is based on Global Navigation Satellite System (GNSS), Micro-Electro-Mechanical System (MEMS) based Inertial Measurement Unit (IMU), Vision Based Navigation (VBN) and other low-cost avionics sensors. The objective of this research is to design a compact, lightweight and relatively inexpensive Nav...

In this paper, a quaternion-based finite-time sliding mode attitude controller is designed for a spacecraft performing high-thrust orbital maneuvers, with cold gas thrusters as its actuators. The proposed controller results are compared with those of a quaternion feedback controller developed for the linearized spacecraft dynamics, in terms of settling time, steady-state error, number of thrust...

The purpose of this study was to propose a new way of representing the structure of expectancy-value attitude and to investigate the implications of its representation. Expectancyvalue attitude was represented as a cognitive network of vertically and horizontally interconnected judgements about product attributes, using a structural equation modeling methodology. Results suggested that a struct...

In a previous paper we proposed a model to study the dynamics of opinion formation in human societies by a coevolution process involving two distinct time scales of fast transaction and slower network evolution dynamics. In the transaction dynamics we take into account short range interactions as discussions between individuals and long range interactions to describe the attitude to the overall...

Electromagnetic actuators are a particularly effective and reliable technology for attitude control of small satellites. As is well known, the main difficulty in the design of attitude control laws based on such actuators is related to the fact that magnetic torques are instantaneously constrained to lie in the plane orthogonal to the local direction of the geomagnetic field vector. Controllabi...

The goal of the present study is to develop a decentralized coordinated attitude control algorithm for satellite formation flying. To handle the nonlinearity of the dynamic system, the problems of absolute and relative attitude dynamics are formulated for the State-Dependent Riccati Equation (SDRE) technique. The SDRE technique is for the first time utilized as a nonlinear controller of the rel...