| With the in-depth study of aircraft and the extension of its application,the defense system of aircraft is gradually improved in recent years.Since the tasks performed by the aircraft are becoming more and more diversified and complicated,single aircraft may fall down on its job in many tasks.Therefore,clustering,intelligence and collaboration become the inevitable trend of development of the aircraft in such a situation.In order to achieve the interaction between the nodes,aircraft network technology can significantly improve the ability of cooperative work,which is the key problem to be solved in the further research of aircraft.The characteristics of long distance,high dynamic network topology and high security requirements of the aircraft network are the major differences compared with the traditional ad hoc network.In this paper,the study is divided into two main parts under the background of frequency-hopping transmission and relative movement of formation flight.The first part is to study frequency-hopping synchronization.By considering the features of long distance and nonnegligible propagation delay in aircraft network,we propose an efficient synchronization method with delay compensation and double frequency hopping control based on time of day(TOD)synchronous prefix method.The advantages of short synchronization time and strong synchronization reliability can effectively solve the influence of propagation delay in long distance communication.After that,the synchronous performance of the synchronization method is simulated and analyzed.The second part analyzes and compares the advantages and disadvantages between the carrier sense multiple access(CSMA)and the time division multiple access(TDMA)protocols in aircraft network scenario.Based on the propagation delay compensation,a dynamic TDMA protocol meeting the master-slave model and full connected network is designed for the high dynamic circumstance.The research is carried out from the network establishment,data transmission,network reconstruction,synchronization maintenance,out-of-step management and so on.Then,the simulation and analytical results of the protocol performance of network setup time,network throughput and network reconfiguration are presented by utilizing the OMNET++ software.At last,the LPC3240 chip is used as the core device to realize the programming and debugging of the protocol,which verifies the feasibility of the research in this paper in engineering practice. |
