Research Of AOS Multi-source Link-layer Receive Simulation Systems Based On HLA-RTI

In order to achieve the development level of space technology and meet the need of many complex tasks of aviation and space flight, the Consultative Committee for Space Data System(CCSDS), published in 1986 and expanded the Advanced Orbiting System(AOS) protocol. AOS system,through a physical channel,transmitted various types of data information like voice, TV image, still images, the experimental data, remote sensing, remote control at the same time, etc.The Advanced Orbiting System depended on the different types of data source and the importance, providing multiple virtual channels to storage data frames, and transmitting in accordance with the virtual channel scheduling method in the same physical channel. At present, the Advanced Orbiting System is particularly important in the field of aerospace technology. HLA-RTI mainly by adopting the object-oriented method to establish simulation model of system, can realize the federal member interaction in the simulation system.The focus of this article is to design,simulate and implement the receiver of the AOS system frame synchronization module and the virtual channel module.First, the principle of AOS much source receiving system overall design block diagram and simulation interface, this paper introduces the configuration scheme of VC6.0 and HLA- RTI development tools, through the interaction between the two host interface to realize the entire AOS much source receive research of simulation system.Secondly, analysis and design and simulation module of frame synchronization, this paper introduces the principle of frame synchronization, leak phenomenon and the phenomenon of false alarm are analyzed, and the four frame synchronization state transitions are analyzed, according to the AOS parameters recommended values of frame synchronization system optimizing part of synchronous type(ASM), the source of five different frame synchronization module design, frame synchronization operation of the simulation results are presented to better reflect the rationality and necessity of frame synchronization.Then, analysis and design of virtual channel points and package and byte were used to extract module, this paper introduces the virtual channel points extraction principle, in principle and package and byte for five different source designed five different VCID, adopt efficient frame generation algorithm, for five different source points and package and byte were used to extract the module design of virtual channel, gives a virtual channel points with and package and byte after extraction of the simulation results, realize the simulation of the AOS receiving system very well.Finally, studied the transmission channel noise, and analyzes the principle and method of VC and Matlab mixed programming design and flow chart of the original waveform and add noise waveform is given comparing the results of figure and text information data, for example, through to the user information data to add the effect of noise interference, presents a text message data byte error of the simulation test results.