为了更真实地仿真分析航空数据链系统性能,基于Exata仿真框架引入半实物仿真思想,结合航空数据链系统,设计开发了契合战场环境的数据链半实物仿真平台。通过分析Exata的各层模型将其与数据链系统进行模型映射,在此基础上利用实装或VC应用程序的接入,建立数据链半实物底层模型,得到上层所需要的数据,实现航空数据链系统的半实物仿真。仿真结果表明,基于Exata建立的半实物仿真平台能够高效模拟航空数据链系统以及作战场景,并对其性能进行验证,为信息化设备的技术研究提供了系统性试验平台,所建立的系统平台具有较高的可信度和较强的灵活性。

To achieve concept of free flight,a research of employing FFADN to provide data access for nodes in the air and ground by regarding air station as data backbone with form of MANET is studied.The conceptual basis of FFADN is summarized first,of whose applying background and major feature are derived later,which also lead to the analysis of research actuality,combined with key technology of FFADN.Finally,an ADN model of free flight for future ATN is proposed,which prospectes and supplies a reference to the development and applying of FFADN.

In order to better simulate and analyse the performance of data link system,the co-simulation idea based on QualNet simulation framework is introduced and a new method that making use of QualNet and Simulink to simulate and analyse the data link system has been put forward.Through the analysis of the lower layer model of QualNet,it is concluded that its own model is difficult to meet the accuracy required by data link simulation.On that base,tuilizing Simulink to build relatively accurate model of the lower layer in data link simulation,obtain the data needed by upper layer and realize the system mentioned before.The simulation results show that the system model created by this method can be more truly reflect the influence on the upper layer protocols made by the lower layer model and has a higher reliability and stronger flexibility.

To further analyze the performance of data link system,it is necessary to choose appropriate simulation software and introduce advanced simulation technology.Based on the comparison of software architectures,protocols,model libraries and the simulation performance of the current frequently-used network simulation software,the advantages of applying QualNet are analyzed and chooses to conduct data link simulation,the needs of data link combined simulation,the hardware-in-the-loop simulation and the distributed simulation technologies are specially researched.Through the analysis,a conclusion is drawn that there are prominent advantages of applying QualNet to carry on data link simulation.At the same time,it is practical to introduce combined simulation,the hardware-in-the-loop simulation and the distributed simulation into data link simulation.

The intra-flight data link is a new dedicated tactical data link used in the aircraft formation to transmit tactical information. A multiple access protocol for intra-flight data link called CSMA-BT (Carrier Sense Multiple Access based on Busy Tone) is proposed in this paper. By analyzing time delay performance of CSMA-BT protocol, the results show that CSMA-BT can meet combat requirement of intra-flight data transmission well.