A Star Network Architecture Selection And Realization

The satellite data system is an important part of the satellite synthesization electron system, it is the center of the satellite, its task is managing the satellite's data and space data communication. Because of the space environment and disable servicing, the demands of the satellite data system is long life and high reliability. Also the satellite confines the weight,volume,power and cost of all devices.As the development of electron technology, satellite's devices are becoming digital, but the communication of them is complex and disorder, and they need different interface. To simplify the situation, the satellite data bus is advanced, it can support the communication between the satellite devices. The data bus can realize the integration of satellite system, joining the devices togather, and completing the message manage, watching,corresponding and controlling the working of the satellite subsystem.Recent years, Ethernet and Embedded System has developed greatly, and the speed of data management is increasing. So it is considered to use Embedded Ethernet as the network of the satellite data system. Embedded Ethernet is to connect embedded systems into Ethernet directly. Embedded Ethernet can visit equipments, realize remote monitor, control, diagnosis and configure functions, and so on. It provides for users a kind of convenient, fast, general and cost-effective control scheme for distribution control in industry fields.The communication of Embedded Ethernet is realized based on standard protocols, including ARP,ICMP,IP,TCP and UDP, and so on. At first ,This thesis simply introduces these days the buses are used in the satellite equipments. Then based on the analysis and comparation of seraval serial buses telenology, considering the development of satellite equipments communication and processing, it is advanced that Embedded Ethernet can be used in the satellite equipments. And it is introduced the development of Ethernet communication and Embedded System, then particularly the Ethernet principle and seravel correlative issue in detail, and then the embedded Ethernet principle. So it is provided a scheme of satellite computer network. At last making use of the MagicARM2200 experiment system, validating the trial of the embedded Ethernet communication. The trial indicates that using embedded Ethernet in the satellite equipments is feasible, the embedded Ethernet has many characteristic, such as high integration, high speed, high reliability, and good real-time, and so on. This technology has a great many development in future.