TCSAR: Target Coverage Mechanism for Sensors With Adjustable Sensing Range in WRSNs
IEEE Sensors Journal（2022）
摘要
In wireless rechargeable sensor networks (
WRSNs
), target coverage is an important issue. However, most studies assumed that the sensors were powered by battery with fixed sensing radiuses. Furthermore, most existing studies applied the Boolean Sensing Model (
BSM
) which cannot reflect the physical features of sensing. As a result, the detection accuracy was decreased in a real application. This paper proposes a target coverage mechanism, called
TCSAR
, which aims to maximize the surveillance quality of the point of interests (
POIs
) under the constraint of perpetual network lifetime. The proposed
TCSAR
applies the Probabilistic Sensing Model (
PSM
) and assumes that the sensing radius of each sensor is adjustable. The proposed mechanism consists of two phases. In the scheduling phase, the
TCSAR
initially evaluates the surveillance contribution of each sensor and then schedules the sensor with the maximal contribution to the bottleneck
POIs
. In the space time transformation phase, the surveillance quality for the
POIs
can be further improved by adjusting the sensing radius of some sensors from space dimension to time dimension. The experimental results show that the proposed mechanism outperforms the existing mechanisms in terms of the worst surveillance quality and the quality of monitoring.
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关键词
Target coverage,probabilistic sensing model,scheduling,wireless rechargeable sensor networks
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