| AOS protocol can effectively meet the needs of complex space tasks.With the indepth study of the AOS protocol,the selection of the simulation system,because HLARTI can separate the simulation capabilities and underlying support environmental,it also has the features of developing independent,integrating and managing easyly.HLARTI can effectively simulate the process of using AOS protocol to manage the largecapacity and high-speed data.Therefore,this paper use HLA-RTI platform to research the AOS multipoint communication simulation system based on HLA-RTI.The main contents are as follows:Firstly,based on the analyses CCSDS AOS system protocol and the architecture of HLA-RTI,AOS multipoint communication simulation system were overall designed.Installating and configurating the simulation software MAK-RTI2.2,VR-Link3.9.1,Visual C ++ 6.0 and Matlab7.Designing the federal functions and Socket interface between the communication system nodes.Secondly,analysis and design the internal member function of communication simulation system node.The main members in the node are total control member,a data processing member,sending member,receiving member,and data recovery member.The total control member is controlling the start of the simulation system.Data processing member use the AOS protocol to package the five sources and add frame synchronization marks and store in character type.Sending member transform the character type into binary bit stream.The binary bit stream is transmitted to the physical channel after being modulated.In the transmission process,the transmission data can be interfered by the spatial noise.The receive datas are demodulate and transformed the binary bit stream into character type by the receiving member.Sending member and receiving member could connect the communication systems and physical channel by transcoding,modulate and demodulate function.They can also simulate the physical channel environment when send and receive data.Data recovery member use the frame synchronization function and data recovery service to extract the datas and recover the original source.The simulation results verify the internal process flow and the function of each node in the simulation system accurately.Finally,have the running processes of AOS multipoint communication simulation system in the noise environment.And obtain the data processing simulation results of each member during the simulation system running.By analyzing the simulation results we can obtaine anti-noise performance of the communication simulation system under different SNR. |
