Improving Estimation Performance in Networked Control Systems Applying the Send-on-delta Transmission Method.
Improving Estimation Performance in Networked Control Systems Applying the Send-on-delta Transmission Method.
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DOI：
10.3390/s7102128
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发表时间：
2007-10-05
期刊：
影响因子：
--
通讯作者：
Suh YS
中科院分区：
文献类型：
--
作者：
Nguyen VH;Suh YS
本文关注的是，在使用SEND-DELTA（SOD）传输方法的网络上改善了状态估计问题。由于研究人员在网络带宽的效率上，更改了指定的δ值。不能确保估计器节点在每个估计周期中定期从传感器节点接收数据。已知传感器值是在最后一个传感器值中使用的（-ΔI，+ΔI）。是为了提出一种算法，其中传感器值间隔降低到（−ΔI/2，+ΔI/2），在某些情况下，提出的算法会改善整体估计性能，而无需在delt-delta算法上任何变化通过数值模拟传感器节点，我们证明了所提出的方法的可行性和实用性。
This paper is concerned with improving performance of a state estimation problem over a network in which a send-on-delta (SOD) transmission method is used. The SOD method requires that a sensor node transmit data to the estimator node only if its measurement value changes more than a given specified δ value. This method has been explored and applied by researchers because of its efficiency in the network bandwidth improvement. However, when this method is used, it is not ensured that the estimator node receives data from the sensor nodes regularly at every estimation period. Therefore, we propose a method to reduce estimation error in case of no sensor data reception. When the estimator node does not receive data from the sensor node, the sensor value is known to be in a (−δi,+δi) interval from the last transmitted sensor value. This implicit information has been used to improve estimation performance in previous studies. The main contribution of this paper is to propose an algorithm, where the sensor value interval is reduced to (−δi/2,+δi/2) in certain situations. Thus, the proposed algorithm improves the overall estimation performance without any changes in the send-on-delta algorithms of the sensor nodes. Through numerical simulations, we demonstrate the feasibility and the usefulness of the proposed method.