关键词: 无线传感器网络, 事件边界检测, 容错, 故障检测

Abstract: Event detection is an important application of wireless sensor networks.Aiming at the detection accuracy is decreased because of the existence of faulty sensor measurements，a distributed algorithm for fault-tolerant event boundary detection is advised.The sensors can identify whether they are faulty or not through exchanging the actual readings only one time with their one-hop neighbors.Then normal event sensors detect whether they are on event boundary by statistical comparison.The event boundary width can be adjusted according to the request of network user.This program is of low communication traffic，low computational complexity and low time delay，and thus scales well to large sensor networks.Simulation results indicate the proposed algorithm is of excellent performance even in the existence of large sensor fault probability.

Key words: wireless sensor network, event boundary detection, fault-tolerant, fault detection