Closed-Form Solution for Joint Localization and Time Synchronization in Wireless Sensor Networks

2010 ◽  
Author(s):  
V. Y. Zhang ◽  
A.-S. Wong
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Closed Form ◽  
Time Synchronization ◽  
Closed Form Solution ◽  
Form Solution ◽  
Wireless Sensor

scholarly journals Above-Threshold Queries of Environmental Conditions Based on Bilinear Interpolation in Wireless Sensor Networks

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4203
Author(s):  
Yaxi Liu ◽  
Wei Huangfu ◽  
Haijun Zhang ◽  
Keping Long
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Closed Form Solution ◽  
Database Systems ◽  
Form Solution ◽  
Sensor Data ◽  
Wireless Sensor ◽  
Bilinear Interpolation ◽  
Efficient Manner ◽  
Aggregate Queries

Wireless sensor networks can be regarded as sensor database systems, which permit users to query sensor data of interest. Among various spatial database queries, we focus the area-wise aggregate queries in the region where the sensor values are above a predefined threshold, which are summarized as above-threshold queries. In this paper, we propose a novel Bilinear Interpolation-Based (BIB) algorithm, which utilizes the bilinear interpolation to estimate the environmental variables inside a grid with the known sensor values at the vertexes, to support the above-threshold queries for regularly-deployed sensor networks and provide the closed-form solution of the above-threshold ratio. We designate experiments with both the artificially-constructed environment data and the real temperature data. Experiment results manifest that the proposed BIB algorithm shows a good performance in estimating the above-threshold ratios to support the above-threshold queries in an accurate and efficient manner.

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