Research And Application Of Post-disaster Emergency Search And Rescue System Based On DT

An emergency search and rescue system is a technological system used to respond to various emergencies and is designed to provide emergency communication,precise search,and efficient rescue.DTN(Delay-Tolerant Networking)is a network architecture designed to deal with communication delays and interruptions due to unreliable network connections.DTN technology uses a store-and-forward model that allows the transmission and exchange of data without a continuous and stable DTN technology uses a store-and-forward model to transmit and exchange data without a continuous and stable network connection,and is widely used in situations where conventional networks cannot be used.In this paper,the following work is done to address the messaging problem and the UAV search and rescue problem in post-disaster emergency search and rescue systems.(1)Sociality-based in Disaster scenarios DTN Routing algorithm(SDR)is proposed to solve the problem that real-time messaging is not possible in post-disaster emergency search and rescue.Using DTN network to construct temporary communication letter network,the algorithm analyzes the social attributes possessed by the nodes in postdisaster scenarios,the movement pattern of the crowd,extracts the corresponding social attribute parameters,constructs mutual contact graph,and uses entropy power method to balance each attribute parameter,so as to determine the best relay node,and also considers the congestion problem in DTN network,compared with the traditional routing algorithm,SDR has a higher delivery probability The SDR has certain advantages over traditional routing algorithms in terms of delivery probability,routing overhead and average delay.(2)The DTN-based in Disaster multi-UAV Emergency search and rescue Coverage algorithm(DUEC)is proposed to solve the problem that UAVs in post-disaster emergency search and rescue cannot transmit messages in real time,flight paths can only be The problem that the flight path can only be planned in advance and the coverage rate of the planned path is too high.Firstly,the map of the affected area is rasterized,the combined potential value is calculated according to the artificial potential field method,and the three indicators of combined potential value,resident access frequency and signal density are subjected to fuzzy logic operation,and the result of its operation is weighted to each raster to determine the next waypoint of the UAV.DTN is introduced for data messaging between UAVs to reduce the repetitive coverage rate of multiple UAVs.The experimental results demonstrate that the algorithm outperforms the traditional algorithm in three metrics: path length,time and weight.