Design And Simulation Studies Of Data Link On Aeronautical Communication System

In modern information warfare, with so many high-tech weapons’ widely using in the military, a lot of new combat modes appeared. The traditional combat modes can not fully grasp the dynamic information and transmit information effectively. So they are unable to meet the needs of the modern battlefield any more. It’s necessary for Modern Warfare to master battlefield intelligence, detection and warning, precision strike and other information fast and correctly.The sharing of battlefield information resources among combat platforms can be achieved by the generation of data link. There is a saying that "If you know yourself and your enemy, you will never lose a battle". Data link can grasp the battlefield situation and master the cooperative engagement capability better, therefore combat troops have inherent advantages in the battle.With the development of cutting-edge aeronautical data chain, and based on the TTNT, this thesis designed an aviation data link communication system,and realized communication technologies of rapid accessing and exiting network. The clustering network mode of aviation data link communication system and the structure of TDMA frame were optimized in this thesis. For the common protocol of dynamic TDMA, we weakened the order of tasks which have the same priority among different nodes, took the node apply slots sizes into consideration, and optimized the same priority number, so that the uniform distribution of slots and the fairness of nodes can be realized. Aiming at the functional requirements and application scenarios for aeronautical communications network, and considering that the network requires the capabilities of high selforganized and high-throughput, we selected Ad Hoc network as the networking mode, and used clustering network structure to design the network. Because of the high-speed mobility and the insatiability of trajectory of the self-organizing low-altitude aviation network, we optimized the traditional weighted clustering algorithm, jointed the aircraft with the relative velocity and acceleration to form a more stable clusters expense scale, and finally make it more capable of satisfying the Ad Hoc network aircraft in high-mobility state.Finally, this thesis used the OPNET software to simulate the data chain built in aeronautical communication system. For the simulation result, we analyzed and validated the data of the node throughput, channel delay, clustering network time, node network, network back delay and so on. The result shows that the revised TDMA algorithm has more reasonable order when facing the application of the same priority slot nodes, and no longer completely depends on the sequence of nodes’ application which would cause unfair distribution; the optimized weighted clustering algorithm, better than most other algorithms, are more suitable to be used in Aero Tactical Data Link when facing some of the damaging behaviors of the network structure such as entry network and access network.So, it is more suitable for using in the aviation data link network.Theoretical analysis and simulation results from two aspects demonstrated the feasibility of the scheme.Results show that the designs meet the system and technical specifications requirements.