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根据甚高频数据链模式2(VDL2)协议体系,在OPNET Modeler上建立VDL2系统的物理层和链路层模型。其中在链路层模型中建立介质访问控制(MAC)、数据链路服务(DLS)和甚高频管理实体(VME)子层模型,具体对平均子网和重传延迟与飞机数量之间的关系进行了仿真,并且还研究了平均子网延迟与发送窗口大小和系统实供负载之间的关系,系统实供负载与数据包发送成功概率和系统吞吐量之间的关系。仿真结果表明,飞机数量对系统的平均重传延迟影响明显,且中间访问延迟TM1取值不宜过大,实供负载不大于0.65时,VDL2系统才能获得良好的传输性能。
According to the VHF Data Link Mode 2 (VDL2) protocol system, the physical layer and link layer model of the VDL2 system are established on the OPNET Modeler. Among them, MAC, DLS and VME sub-layer model are set up in the link layer model, and the sub-layer model of average sub-network, retransmission delay and number of aircraft The relationship between the average subnet delay and the size of the sending window and the system real load is also studied. The relationship between the real load of the system and the probability of packet sending success and the throughput of the system is also studied. The simulation results show that the number of aircraft has a significant impact on the average retransmission delay of the system, and the value of the intermediate access delay TM1 should not be too large. When the actual load is not greater than 0.65, the VDL2 system can obtain good transmission performance.