The Research Of Network Technology In Wireless Satellite Bus

In order to satisfy the need of building Space-based Information System rapidly in our country when sudden natural disasters or Partial war happened, we need a kind of new technology in micro-satellite designing with the advantage of fast testing, fast integration and fast assembling. However, the consumption of time in traditional micro-satellite designing technology is too large, which can not content the demand for quick launches. This dissertation prose a new technology on the basis of analyzing of existing defect of traditional satellite, which introduced wireless networking technology instead of traditional wired bus. This technology can reduce the interconnection of electrical equipment for satellite subsystem complexity, and simplify testing and integration of satellite processes.Firs of all, considering the specificity of application of wireless networking technology, this dissertation analyzed the link performance of intra-satellite networking, giving the simulation of the relationship between bit of error and SNR. The subject developed a network protocol of wireless network of intra-satellite. Secondly, the model of the protocol is established according to the international OSI model including Physical layer, Data link layer and Application layer. According to each layer's responsibility and intra-satellite function demands, the intra-satellite communication system's architecture and establishing procedure have been summarized, and the communication parameters in inter-satellite link integration design have been settled to S-band radio frequency, Gaussian Frequency Shift Keying (GFSK) modulation, point-to-point network topology, Data link layer is an innovative mechanism to control access links, which uses the Prior information of satellite, and allocate the ID number to Independent nodes. So every node in the network can have the choice to access to the channel and send information to others. At the same time, the Data link layer can also support the plug and play function of the networking. The CRC error detection mechanism is used to improve reliability of communication system. The Application layer data frame format for the definition and application parameters of the distribution.In order to verify the feasibility of the wireless network protocol of intra-satellite networking system, the dissertation gave the design program of hardware of the networking node. This dissertation constructed a networking system composed of several hardware nodes, and verified the basic function and plug and play function of the developed protocol of intra-satellite wireless networking system. This subject test and analyzed of the whole network system performance including bit error rate, networking delay and equity, the results fully confirmed the correctness of intra-satellite wireless networking protocol and the feasibility of the proposal of intra-satellite wireless networking system.