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Path Selection for Firefighters Based on Mobile Ad Hoc Networks

Author: ZhangQianYi
Tutor: LiDeMin
School: Donghua University
Course: Signal and Information Processing
Keywords: Mobile Ad Hoc Networks Path Selection Information Fusion
CLC: TN929.5
Type: Master's thesis
Year: 2013
Downloads: 55
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Abstract


With the rapid development of economic construction, factors of causing fire have a large increase in recent years. Frequent fire accident not only brings huge property losses, but also is a serious threat to people’s life safety. People all over the world jointly deal with this catastrophic problem. Due to communication thwarted, firefighter casualty incidents happen occasionally in many fire rescue tasks. Most of the network facilities are destroyed and failure in the scene of fire. So the cable network system is inefficiency and fragility. The mobile Ad hoc network is a kind of network that doesn’t rely on any fixed facilities and has a good anti-destroying ability. So it is widely used in the disaster rescue. The secure mobile Ad hoc network applies robots as network nodes. They guarantee the communication in fire and at the same time robots help firefighters carry out search and rescue operations. Reasonable rescue and evacuation paths selected by firefighters effectively guarantee the rescue activities. The paths are key factors to shorten evacuation time, improve rescue efficiency and ensure life safety of victims and rescuers.First of all, this paper studies on fire rescue issues. At present, the search method is firefighters directly enter the fire scene and carry out a blanket search according to certain rules. This search method has many defects such as difficult to locate targets, easily missing information and low safe coefficient. Therefore, we use robots assist firefighters in rescue and propose a new man-machine cooperation search strategy. Robots move according to the established mles with firefighters so that the secure network can unfold in the rescue area. Meanwhile firefighters obtain environmental and position information from near robots and they determine the next forward position making use of the near robot position and the triangle network method. Firefighters cooperate with robots while searching the target area and constructing the network. This paper puts forward one team and double team search plan and the corresponding networking strategy. And we also propose a solution to forward the edges and obstacles problem.Secondly, the paper studies on the path selection in the process of evacuation. The shortest path isn’t the optimal path when evacuation. As the fire spread, the shortest path nearby may not be safe, which would cause damage to evacuees. So evacuation should consider both the path length and safety. The secure networking mentioned above solves the tough problem of communicating in the fire scene and assessing environment. We propose an optimal evacuation path selection method used in this networking. And the method creates the directed graph based on the baseline vector, which is the direction vector of the source node to the destination node. We call this vector SDBV (Source Node-Destination Node Direction Vector as Baseline Vector).Through the calculation of the vector of two random nodes and the baseline vector, the method finds out all passable direct paths. They ensure that firefighters evacuate towards exit. Moreover using D-S evidence theory to evaluate the environment avoids the misjudgment of the single sensor. The goal is to find the short and high safety evacuation path. The numerical simulation results prove the feasibility and superiority of the proposed method.At last, we verify the method with examples and point out problems to be solved.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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