Research On In-orbit Autonomous GNC System Architecture Based On Atomic State Machine

In-orbit autonomous GNC system is an important system to guaranteespacecraft to explore deep space.By analyzing,we apply the hybrid system theoryinto satellite attitude and orbit control system.Then,design In-orbit autonomousGNC system based on aomic state machine and accomplish closed-loop simulationprogram.Finally, the whole system was simulated and verified by experiment. Themajor work of this paper is as follows:Firstly, design and accomplish the mathematical and structures models ofatomic state.Divide GNC system into several atom and create three aomic statemachine based on management layer, control layer and execution layer.Then,describe the satellite attitude by creating satellite attitude dynamics andkinematics model.Establish several atomic model of GNC system,they are actuatoratom,sensor atom,orbit determination atom, attitude determination atom,attitudeguidance atom, attitude control atom and fault diagnosis atom.According to thedifferent operating modes,we design different control law and make controlallocation algorithm.Finally,design and accomplish the whole closed-loop simulation program of thesatellite GNC system.Design simulation interface using GUI toolbox of matlab.Finally, the whole system was simulated and verified by experiment.