Software-in-the-loop for attitude determination and control system using SIMULINK and Real-Time Workshop™

This paper presents the software-in-the-loop simulator called as Satellite Simulator (SATSIM). The GNC laboratory at INHA University has been developing the SATSIM for last 4 years as a design verification tool for attitude determination and control system(ADCS). The SATSIM consists of the environmental modules and the onboard software modules. The environmental modules simulate the real attitude dynamics, external environment and hardware components with nonlinear characteristics. The onboard software modules include the attitude determination algorithm such as the Kalman filtering, and the attitude control laws such as the PIID control law. The SATSIM uses the SIMULINK as a platform and the Real-Time Workshop(TM) to accelerate the execution speed of SIMULINK. Using SATSIM, we verify the ADCS performance of Korea Multi Purpose Satellite (KOMPSAT) which is scheduled to launch on July 1999.