In this paper, a new kind of communication bus using time-triggered protocol was introduced, which brings higher reliability and less time delay. Specifically, the basic features of the time-triggered network, such as frame structure, fault-tolerant character and time synchronization, were investigated, and the feasibility of applying it in the spacecraft control system was discussed. However, considering the channel capacity of the network is always limited, it means that.only part of the system components can exchange information with the communication.network, which may significantly affect the system performance. Consequently, developing an effective access mechanism that can guarantee the stability and robustness of the spacecraft control system becomes a challenging problem in network and control system integration on the spacecraft. In order to solve this, the design strategy of a control optimal communication schedule in time-triggered networked control system for spacecraft was studied here. The mathematic model of a periodic schedule was first given, and the system augmented model was then derived with the network dynamics integrated. Finally, an illustrative example was given to demonstrate the availability of the proposed scheduling method. The comparison of the response for the system with and without the scheduling shows an intuitive result of this method. The scheduling method discussed here provides important technical reference to the integration application of time-triggered bus technology in the aerospace field.
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