This seminar paper deals with the designing of a spacecraft simulator in the most economic way. The simulator has been designed for educating and training control engineers. The greatest difficulty in implementing spacecraft control law is that ground based experiments must take place in 1-g environments, where as the actual spacecaft will operate under 0-g condition.In this paper we will be discussing about how to create a 0-g torque free environment. The paper describes the spacecraft platform ,which houses various spacecraft components. The advantage of using aluminium platform is discussing in this portion. The subsystem description in which we discuss about air bearing,batteries etc.In this portion we will discuss about SRA 300 spherical air bearing and electrical systems in the simulator. Spacecraft attitude sensor,which is a dynamic measuring unit(DMU-AHRS) is chosen as the attitude sensor unit. This portion describes DMU-AHRS sensor unit which provides the Eulrian angle ,angular rates and linear acceleration. Momentum wheel speed and acceleration sensor in which we will discuss about why we use encoders instead of tachometer for measuring wheel speed. Wheels,motors,power amplifiers and all the hardware and software that handles the hardware controls will be discussing in this portion. Filtering and identification of motor parameters in which we deals with filter design-a Butterworth or Chebyshev type-1 filter.Estimation of motor damping and choice of reaction wheels in which we will see the effect of friction torque in choosing reaction wheel. Identification of motor dynamics in which identification of motor transfer function using least square technique, identification of moment of inertia – conclusion.
