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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 57210 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Namvar, Mehrzad
- Abstract:
- A multi-satellite system refers to a network of satellites that work together to achieve a common goal. Increasing the covered area due to the presence of a large number of satellites, reducing the cost of designing, manufacturing and launching small satellites compared to an expensive complex satellite, increasing system reliability and resistance to malfunctions, and also the possibility of troubleshooting and fixing the fault in less time are advantages of using multi-satellite systems compared to a single-satellite system. Today, these systems are used in many fields such as earth observation and remote sensing, telecommunications and data transmission, navigation and Positioning and military and security applications. In general, in satellite control, the control methods are divided into two categories: position control, which leads to the change of satellite coordinates, and rotation control, which changes the orientation of the satellite. In this thesis, the focus is on controlling the satellites attitude and synchronizing the direction of the satellites in the network. In this regard, firstly, the method of controlling the kinematics of a satellite by focusing on the rotation matrix R and the angular velocity control signal ω is discussed using Lyapunov stability, then the satellite dynamic equation is added to the satellite control law using the backstepping control method. In the following, by expanding the control law, the method of controlling the multi-satellite system is investigated. Multi-satellite systems are considered a special case of multi-agent systems MAS, therefore, relying on the control concepts of these systems, considering 4 satellites in a network to describe the relationships between satellites The graph theory approach is used and the control law is investigated for control modes without leader or consensus, leader-follower, synchronization in variable configuration. In all the mentioned cases, the control law is simulated in MATLAB software and the obtained results are given
- Keywords:
- Lyapunov Stability ; Multiagent System ; Rotation Matrix ; Multi Satellites Controlling ; Satellite Control
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