Sensor Localization Using Time of Arrival Measurements in a Multi-Media and Multi-Path Application of In-Situ Wireless Soil Sensing
Sensor Localization Using Time of Arrival Measurements in a Multi-Media and Multi-Path Application of In-Situ Wireless Soil Sensing
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DOI：
10.3390/inventions6010016
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发表时间：
2021-03-01
期刊：
影响因子：
3.4
通讯作者：
Kumar, Ratnesh
中科院分区：
文献类型：
--
作者：
Sahota, Herman;Kumar, Ratnesh
本文研究了无线传感器网络节点在不同物理介质(地上锚节点和地下传感器节点)中的定位问题。我们使用相邻传感器节点之间以及卫星节点与传感器节点之间传输的信号到达时间作为测距度量。将定位问题表示为到达时间值的联合分布的参数估计。基于严格的统计分析，推导出信号到达时间的概率分布，并将其参数表示为传感器节点的位置坐标。作为网络中各种到达时间变量的联合分布的参数，计算了节点位置坐标的最大似然估计。通过灵敏度分析研究土壤复介电常数和磁导率测量误差对估计值的影响，以验证模型和方法的有效性。
The problem of localization of nodes of a wireless sensor network placed in different physical media (anchor nodes above ground and sensor nodes underground) is addressed in this article. We use time of arrival of signals transmitted between neighboring sensor nodes and between satellite nodes and sensor nodes as the ranging measurement. The localization problem is formulated as a parameter estimation of the joint distribution of the time of arrival values. The probability distribution of the time of arrival of a signal is derived based on rigorous statistical analysis and its parameters are expressed in terms of the location coordinates of the sensor nodes. Maximum likelihood estimates of the nodes' location coordinates as parameters of the joint distribution of the various time of arrival variables in the network are computed. Sensitivity analysis to study the variation in the estimates with respect to error in measured soil complex permittivity and magnetic permeability is presented to validate the model and methodology.