Remote Nonlinear State Estimation With Stochastic Event-Triggered Sensor Schedule

Remote Nonlinear State Estimation With Stochastic Event-Triggered Sensor Schedule
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使用随机事件触发传感器调度的远程非线性状态估计

DOI:
10.1109/tcyb.2017.2776976
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发表时间:
2019-03
影响因子:
11.8
通讯作者:
Yang Hongjiu
Yang Hongjiu
中科院分区:
计算机科学1区
文献类型:
--
作者:
Li Li;Yu Dongdong;Xia Yuanqing;Yang Hongjiu

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研究了通信受限的无线传感器网络中非线性系统的远程状态估计问题。由于非线性变换导致的非高斯特性,利用无迹变换技术获得状态和测量的近似高斯概率分布。为了减少过多的数据传输,不可控和可控的随机事件触发调度方案的开发,以决定是否当前的测量应该被发送。与现有的一些确定性事件触发调度方案相比,新开发的方案在保持新息过程的高斯性方面具有潜在的优势。在所提出的方案下,两个非线性状态估计器的设计基于无味卡尔曼滤波器。通过分析估计误差和误差协方差的性质,建立了这两种估计的稳定性和收敛性条件。结果表明,通信速率和估计质量之间的预期妥协,可以通过适当调整事件触发的参数矩阵。数值算例验证了所得结果的有效性.
This paper concentrates on the remote state estimation problem for nonlinear systems over a communication-limited wireless sensor network. Because of the non-Gaussian property caused by nonlinear transformation, the unscented transformation technique is exploited to obtain approximate Gaussian probability distributions of state and measurement. To reduce excessive data transmission, uncontrollable and controllable stochastic event-triggered scheduling schemes are developed to decide whether the current measurement should be transmitted. Compared with some existing deterministic event-triggered scheduling schemes, the newly developed ones possess a potential superiority in maintaining Gaussian property of innovation process. Under the proposed schemes, two nonlinear state estimators are designed based on the unscented Kalman filter. Stability and convergence conditions of these two estimators are established by analyzing behaviors of estimation error and error covariance. It is shown that an expected compromise between communication rate and estimation quality can be achieved by properly tuning event-triggered parameter matrix. Numerical examples are provided to testify the validity of the proposed results.
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