The Research Of Wireless Network Technology In Satellite Bus

Quickly making space information system for the modernization of nationaldefense has important significance, for in the fierce competition in the spacetechnology in an invincible position, there is an urgent need a breakthrough digitalflexible design, have fast assembly, test, and replace the key technologies, such asthe small satellite technology development platform. In order to adapt to thedevelopment of space technology in our country in the future, this paper puts forwarda small satellite development platform new technology-the wireless satellitetechnology development platform. The technology using the wireless communicationtechnology instead of traditional cable bus design, support equipment plug and play,ensure rapid assembly, fast satellite test, rapid replaced. This subject focuses on theresearch content as follows:According to the traditional satellite development platform cable bus structureof the defects are analyzed, and the development of the concept of wireless satelliteplatform: wireless satellite development platform is a system, component or unitbetween the wireless technology in data information exchange satellite, except thepower supply and cable each single components outside, satellite system no othercable connections, is a new system based on wireless communications satellite. Andanalyzes the development platform of wireless satellite advantage.After finishing the star in wireless channel after analysis, it is concluded that theinformation transmission main wirelessly by multipath effect. And according to theOSI Network model, it is proposed that a the classic of the physical layer of the OSImodel, data layer and the application layer three layer of development platform forWireless satellite Network protocol PNPWAN (Plug-and-Play Wireless AreaNetwork). Agreement in ISM band work, using the GFSK demodulation mode, datatransfer rate of2Mbps. Media access mechanism using frequency division ways,network topology structure similar to star structure, the agreement itself is equippedwith error control mechanism, the plug and play mechanism, independent exitnetwork system and fault handling mechanism.Based on the design C8051F040+nRF24L01communication module. Throughthe realization of hardware design and software program node compiling, and makethe wireless network within each node in the press PNPWAN agreement betweencommunication. And the design based on ARM embedded Linux data monitoringterminal.Build a small wireless network system, and according to the actual working condition PNPWAN agreement, respectively from the node plus electric plug namelyafter that land join the network stage, normal communication stage and independentexit network stage to verify agreement last its performance analysis. Proof that thesatellite wireless network communication agreement within PNPWAN and wirelesssatellite the feasibility of developing platform.