Wireless sensor network-oriented fault-tolerance event boundary detection method

Abstract

The invention discloses a wireless sensor network-oriented fault-tolerance event boundary detection method. The method comprises the following steps: detecting a failure node and correcting the measurement value based on a weighted median failure node correction method, and judging whether the node is an event boundary node based on an event boundary node judgment method for a normal vector. The failure node correction method makes preparations for the event boundary node judgment method, and the detection precision of the event boundary node is improved. The problem of the spatial differences of the sensing information of adjacent nodes in the event boundary area is solved, the event boundary is determined by utilizing the point, and the detection precision of the event boundary node is improved; by employing a distributed detection method, the method has high fault tolerance, the judgment result is uploaded on the event boundary node only, the energy consumption of the sensor network is reduced, and the life cycle of the network is prolonged; and moreover, the event boundary can be detected, the event spreading direction is determined, and scientific basis is provided for formulating rescue measures for a decision maker.

Description

Technical field [0001] The invention relates to a fault-tolerant event boundary detection method oriented to a wireless sensor network. Background technique [0002] The wireless sensor network is composed of a large number of low-power, cost-effective sensor nodes, which can self-organize to form a wireless network system after deployment. Wireless sensor networks are mainly used to monitor, detect, and report abnormal conditions that occur in the deployment area, especially dangerous events such as forest fires and the leakage of toxic chemicals. As people pay more attention to wireless sensor network technology, event boundary detection has become one of the important applications of wireless sensor networks. [0003] The literature [Chintalapudi KK, Govindan R. Localized edge detection in sensor fields. Ad Hoc Networks, 2003, 1(2-3), pp.273-291] discusses three types of methods for event boundary detection: statistical methods, Image processing-based methods and classificatio...

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Problems solved by technology

[0011] By analyzing and summarizing the existing wireless sensor network event boundary detection schemes at home and abroad, it can be seen that although there have been some research results, there are still the following problems: In the event boundary area, the characteristics of environmental events detected by adjacent nodes It may be just the opposite. Based on spatial correlation, these nodes interfere with each other, and the possibility of introducing new detection errors increases, which cannot achieve the purpose of fault-tolerant detection.

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