Research On Air-ground Cooperative Video Ad Hoc Communication Routing Protocol Of Close-distance

The ad hoc communication network of close-distance air-ground cooperation has many characteristics which are convenient networking,strong mobility and good concealment.And it is widely applied in the fields of military investigation and civil disaster relief.However,the video ad hoc communication of close-distance air-ground cooperation is affected by changeable network topology and unstable wireless transmission environment.In the transmission process,it suffers from large time delay and high packet loss rate,which affect the real-time and reliability of transmission.In order to solve the problem of high time delay in video ad hoc communication,a realtime priority routing algorithm has been proposed;in order to solve the problem of high packet loss rate,a reliability priority routing algorithm has been proposed.Both algorithms provide a basis for real-time and effective transmission of ad hoc video.The main contents and contributions of this paper are as follows:(1)In view of the close-distance air-ground collaborative environment,the factors influencing the real-time communication of video ad hoc are analyzed,such as the relay nodes,the number of route reconstruction and so on.The Markov prediction model is used to model the nodes in the network,then predicting the direction of movement of the node.A new algorithm of real-time priority routing(M-AODV,AODV Routing Method Based on Node Motion Direction Prediction)for video ad hoc communication has been proposed.The results show that the proposed algorithm can effectively reduce the video transmission delay.It is decreased by 5% compared with AODV protocol video transmission delay.The algorithm enhances the real-time of video transmission.(2)In view of the close distance air-ground collaborative environment,the factors influencing the video ad hoc transmission reliability are analyzed,such as the available bandwidth of the channel in the network,the transmission rate and so on.Based on the fuzzy logic reasoning theory,the available channel bandwidth between nodes is estimated,and the channel capacity is used as the basis of routing.A new algorithm of reliability priority routing algorithm(AB-AODV,Based on the channel capacity of AODV routing method)for video ad hoc communication has been proposed.The results show that the proposed algorithm can effectively reduce the packet loss rate of video transmission,which is 15% lower than that of AODV protocol,and improves the transmission reliability of video transmission.(3)Designing and implementing of the close-distance air-ground cooperation video ad hoc transmission verification system.Based on the related functions of V4L2(Video for Linux 2),a video camera based on USB camera is designed and implemented;Using jpeg algorithm to design and implement the video frame compression and display functions;Designing and implementing of the video frame packet fragmentation transmission,which improves the video transmission efficiency.The program is transplanted to the close-distance air-ground cooperative video ad hoc communication demonstration platform,then the video self-organized transmission is tested.In this paper,from the perspective of routing stability,the real-time video routing algorithm is studied.Based on the available bandwidth of the transmission link,the routing algorithm of video transmission reliability is studied.In the open air-ground cooperation platform,the close-distance video ad hoc communication is tested,and the validity of the proposed algorithm is verified.