Satellite Attitude And Orbit Control System Software Architecture Design Of The Program

With the continuous development of the satellite technology and increase of the system complication, the design of software architecture for the Attitude and Orbit Control System of satellite has become an important problem.Based on the theory of software architecture, the hierarchical structure is used for designing the software system because the AOCS demands real-time and high reliability. The integrated environment for software cross-development of VxWorks is used for simulating the schedule of several multi-tasks, the managing of work mode and the communication among the modules.An approach of software architecture for the Attitude and Orbit Control System of satellite is developed in this paper, which is based on a deep study and analysis of modern software techniques. This paper includes the following aspects:(1) By comparing of a various of software schemes, the modularization and hierarchical structure is presented;(2) The real-time operating system VxWorks is used to administrate the resource;(3) Time-event driven strategy based on message and time processing is chosen to meet the system demands;(4) The vertical and horizontal hierarchical structure is applied to design the application layer of AOCS;(5) The simulation practice of some functions has been finished.Compared to the traditional design approach, the hierarchical structure approach of this paper has improved the reliability of AOCS. It has made system easy to realize, upgrade, transplant, reconfigure and have adaptability. The design has reached the key design objects of AOCS. The method described in this paper can be applied to design the other software system of satellite and the real-time ground control systems.