基于OPNET的VDL2系统传输性能仿真研究  

Simulation research on VDL2 system transmission performance based on OPNET

作　　者：李冬霞[1] 叶倩文[1] 

机构地区：[1]中国民航大学天津市智能信号与图像处理重点实验室,天津300300

出　　处：《中国民航大学学报》2012年第6期60-64,共5页Journal of Civil Aviation University of China

基　　金：中央高校基本科研业务费专项(ZXH2010B004)

摘　　要：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 aviation VHF Data Link Mode 2（VDL2） protocol architecture,the physical layer and link layer models of VDL2 system based on the OPNET Modeler were built.The models of Media Access Control（MAC）,Data Link Services（DLS） and VHF Managemengt Entity（VME） sublayer were built in link layer model.The relationships between average subnet delay,average retransmission delay and aircraft number were simulated first.Then another four simulations were researched,which were the relationship between average subnet delay and sending window size,the relationship between average subnet delay and system offered load,the relationship between offered load and the probability of successfully sending data packet,and the relationship between offered load and system throughput.The results show that the aircraft number has a significant effect to the system average retransmission delay,also the value of Inter-Access delay TM1 is not too large,VDL2 system can achieve well transmission performance if the offered load is no more than 0.65.

关 键 词：甚高频数据链模式2协议 OPNETModeler 重传 延迟 吞吐量 

分 类 号：V35[航空宇航科学与技术—人机与环境工程] TP391.9[自动化与计算机技术—计算机应用技术]