STARS-II is a pico-satellite which will launch by HIIA rocket of the Japan Aerospace Exploration Agency on 2013. The primary object of STARS-II is technical verification of tethered robotic system. STARS-II consists of Mother Satellite and Daughter Satellite connected by Electro Dynamic Tether. STARS-II has actuators in order to perform tether deployment and robotic mission. Main missions on ST...

Magnetic torquing is attractive for generation of control torques on small satellites. The concept is that interaction between the Earth's magnetic eld and a magnetic eld generated by a set of coils in the satellite is used for actuation. This principle is inherently nonlinear, and diicult to use because control torques can only be generated perpendicular to the geomagnetic eld vector. So far, ...

Magnetic torquing is attractive as a control principle on small satellites. The actuation principle is to use the interaction between the earth's magnetic eld and magnetic eld generated by a coil set in the satellite. This control principle is inherently nonlinear, and diicult to use because control torques can only be generated perpendicular to the geomagnetic eld vector. This has been a serio...

The attitude control of a satellite is often characterized by a limit cycle, caused by measurement inaccuracies and noise in the sensor output. In order to reduce the limit cycle, a nonlinear fuzzy controller was applied. The controller was tuned by means of reinforcement learning without using any model of the sensors or the satellite. The reinforcement signal is computed as a fuzzy performanc...

The topic of this thesis is attitude control of a micro-satellite. Due to their physical size, microsatellites have fairly limited power supply, data storage, and computational resources, hence making it crucial to have a simple and reliable control system. A reasonable approach is to evaluate the controller off-line, and consequently reducing the need for CPU speed drastically as real-time eff...

Sliding mode control algorithms with classical and modified discontinuous reaching laws for purely magnetic attitude control of small satellites are proposed and compared with each other in this work. They are designed by following the steps characteristic to the variable structure control method and the magnetic attitude control problem. The asymptotical stability of the control laws is proven...

• 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...

The success of a satellite mission is dependent on the accuracy of the measurement of its mass properties. Mass properties of a satellite viz. static and dynamic unbalance play a vital role in during satellite launching and attitude and orbital control. Satellite’s center of gravity (staic unbalance) and product of inertia (dynamic unbalance) are measured in Vertical Dynamic Balancing Machine (...

Exploration of asteroids and small-bodies can provide valuable insight into the origins of the solar system, into the origins of Earth and the origins of the building blocks of life. However, the low-gravity and unknown surface conditions of asteroids presents a daunting challenge for surface exploration, manipulation and for resource processing. This has resulted in the loss of several landers...