The work proposes a distributed Kalman filtering(KF)algorithm to track a time-varying unknown signal process for a stochastic regression model over network systems in a cooperative way.We provide the stability analysi...The work proposes a distributed Kalman filtering(KF)algorithm to track a time-varying unknown signal process for a stochastic regression model over network systems in a cooperative way.We provide the stability analysis of the proposed distributed KF algorithm without independent and stationary signal assumptions,which implies that the theoretical results are able to be applied to stochastic feedback systems.Note that the main difficulty of stability analysis lies in analyzing the properties of the product of non-independent and non-stationary random matrices involved in the error equation.We employ analysis techniques such as stochastic Lyapunov function,stability theory of stochastic systems,and algebraic graph theory to deal with the above issue.The stochastic spatio-temporal cooperative information condition shows the cooperative property of multiple sensors that even though any local sensor cannot track the time-varying unknown signal,the distributed KF algorithm can be utilized to finish the filtering task in a cooperative way.At last,we illustrate the property of the proposed distributed KF algorithm by a simulation example.展开更多
[目的/意义]针对温室温湿度预测中多传感器数据融合可靠性低、传统模型忽略温湿度动态耦合,以及参数调优依赖人工经验等问题。[方法]首先,对传统卡尔曼(Kalman)滤波算法实施改进,通过动态调整过程噪声协方差和观测噪声协方差,结合新息...[目的/意义]针对温室温湿度预测中多传感器数据融合可靠性低、传统模型忽略温湿度动态耦合,以及参数调优依赖人工经验等问题。[方法]首先,对传统卡尔曼(Kalman)滤波算法实施改进,通过动态调整过程噪声协方差和观测噪声协方差,结合新息方差动态分配多传感器权重。其次,针对温湿度的强耦合性及其协同控制的需求,构建多输出长短期记忆-注意力机制(Long Short-Term Memory-Attention,LSTM-Attention)模型,以温湿度协同预测为目标,引入注意力机制自适应加权关键环境因子,并采用灰狼优化算法(Grey Wolf Optimizer,GWO)自动对超参数进行寻优。[结果和讨论]提出的自适应卡尔曼滤波算法在多点温湿度融合中的平均绝对偏差分别为1.59℃和8.64%,比传统卡尔曼滤波算法分别降低1.24%、8.57%。以该算法融合结果作为模型训练集,模型在温湿度预测中决定系数R2分别达到98.2%和99.3%,比传统Kalman提升4.7%和4.3%。GWO-LSTM-Atten⁃tion模型的温湿度预测均方根误差分别为0.7768℃和2.0564%,比LSTM、LSTM-Attention时间序列预测模型分别降低15.6%、6.6%,湿度分别降低29.2%、5.7%。[结论]提出的自适应卡尔曼融合算法能够有效抑制异常值影响,可在非平稳环境变化下实现多传感器数据可靠融合。在温室多环境因子预测中,GWO-LSTM-Attention模型温湿度预测值在未来可作为控制温室环境的重要参考,进而实现对温室环境的实时调控。展开更多
Using similar single-difference methodology(SSDM) to solve the deformation values of the monitoring points, there is unstability of the deformation information series, at sometimes.In order to overcome this shortcomin...Using similar single-difference methodology(SSDM) to solve the deformation values of the monitoring points, there is unstability of the deformation information series, at sometimes.In order to overcome this shortcoming, Kalman filtering algorithm for this series is established,and its correctness and validity are verified with the test data obtained on the movable platform in plane. The results show that Kalman filtering can improve the correctness, reliability and stability of the deformation information series.展开更多
The standalone Global Positioning System (GPS) does not meet the higher accuracy requirements needed for approach and landing phase of an aircraft. To meet the Category-I Precision Approach (CAT-I PA) requirements of ...The standalone Global Positioning System (GPS) does not meet the higher accuracy requirements needed for approach and landing phase of an aircraft. To meet the Category-I Precision Approach (CAT-I PA) requirements of civil aviation, satellite based augmentation system (SBAS) has been planned by various countries including USA, Europe, Japan and India. The Indian SBAS is named as GPS Aided Geo Augmented Navigation (GAGAN). The GAGAN network consists of several dual frequency GPS receivers located at various airports around the Indian subcontinent. The ionospheric delay, which is a function of the total electron content (TEC), is one of the main sources of error affecting GPS/SBAS accuracy. A dual frequency GPS receiver can be used to estimate the TEC. However, line-of-sight TEC derived from dual frequency GPS data is corrupted by the instrumental biases of the GPS receiver and satellites. The estimation of receiver instrumental bias is particularly important for obtaining accurate estimates of ionospheric delay. In this paper, two prominent techniques based on Kalman filter and Self-Calibration Of pseudo Range Error (SCORE) algorithm are used for estimation of instrumental biases. The estimated instrumental bias and TEC results for the GPS Aided Geo Augmented Navigation (GAGAN) station at Hyderabad (78.47°E, 17.45°N), India are presented.展开更多
针对无线传感器网络中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)定位技术易受环境影响、定位精度较低的问题,提出一种将RSSI定位过程分为测距阶段与定位阶段的双阶段优化方法。测距阶段,改进卡尔曼滤波算法以RSS...针对无线传感器网络中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)定位技术易受环境影响、定位精度较低的问题,提出一种将RSSI定位过程分为测距阶段与定位阶段的双阶段优化方法。测距阶段,改进卡尔曼滤波算法以RSSI信号均值作为初始状态估计,结合网格遍历搜索优化过程噪声协方差和测量噪声协方差参数,提升卡尔曼滤波算法的适应性和滤波效果,降低测距阶段的误差;定位阶段,使用多策略改进鲸鱼优化的节点位置估计算法求解未知节点位置,进一步提高定位精度。该算法通过K-means聚类初始化策略、精英反向学习策略和随机鲸鱼学习策略,提升原始鲸鱼优化算法的全局搜索能力和收敛速度,进一步提高定位精度。实验结果表明,该双阶段优化方法在定位误差控制方面优于传统的单阶段优化策略,具备更高的定位精度与更强的环境适应能力,并在与其他对比算法的性能比较中展现出明显优势。展开更多
无迹卡尔曼滤波(unscented Kalman filter,UKF)是锂离子电池荷电状态(state of charge,SOC)估计的常用算法之一。然而在实际应用中,由于受到外界环境温度变化、电池容量退化等不确定性干扰,以及非高斯过程噪声的影响,需要进一步提高算...无迹卡尔曼滤波(unscented Kalman filter,UKF)是锂离子电池荷电状态(state of charge,SOC)估计的常用算法之一。然而在实际应用中,由于受到外界环境温度变化、电池容量退化等不确定性干扰,以及非高斯过程噪声的影响,需要进一步提高算法的性能才能更有效地保证估计精度。基于此,提出一种改进的无迹卡尔曼滤波算法(PO-RUKF)。首先,在UKF中引入H∞滤波提高算法的鲁棒性,用来克服各种干扰带来的不良影响。其次,利用鹦鹉优化算法对UKF的过程噪声协方差矩阵进行自适应调整,以解决滤波噪声参数先验确定的问题,从而提高滤波精度。最后,采用马里兰大学的FUDS和HPPC工况下的两种公开数据集进行了实验验证,结果表明,在不同的温度、电池容量退化状态以及不同的工况下,相比于传统的UKF算法以及鲁棒UKF算法,改进后的算法具有更高的SOC估计精度,平均绝对误差小于0.50%,均方根误差小于0.56%,此外还展现出更强的鲁棒性和普适性。证实所提方法可以为锂离子电池SOC估计提供更可靠、有效的技术支撑。展开更多
基金supported in part by Sichuan Science and Technology Program under Grant No.2025ZNSFSC151in part by the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No.XDA27030201+1 种基金the Natural Science Foundation of China under Grant No.U21B6001in part by the Natural Science Foundation of Tianjin under Grant No.24JCQNJC01930.
摘要The work proposes a distributed Kalman filtering(KF)algorithm to track a time-varying unknown signal process for a stochastic regression model over network systems in a cooperative way.We provide the stability analysis of the proposed distributed KF algorithm without independent and stationary signal assumptions,which implies that the theoretical results are able to be applied to stochastic feedback systems.Note that the main difficulty of stability analysis lies in analyzing the properties of the product of non-independent and non-stationary random matrices involved in the error equation.We employ analysis techniques such as stochastic Lyapunov function,stability theory of stochastic systems,and algebraic graph theory to deal with the above issue.The stochastic spatio-temporal cooperative information condition shows the cooperative property of multiple sensors that even though any local sensor cannot track the time-varying unknown signal,the distributed KF algorithm can be utilized to finish the filtering task in a cooperative way.At last,we illustrate the property of the proposed distributed KF algorithm by a simulation example.
摘要[目的/意义]针对温室温湿度预测中多传感器数据融合可靠性低、传统模型忽略温湿度动态耦合,以及参数调优依赖人工经验等问题。[方法]首先,对传统卡尔曼(Kalman)滤波算法实施改进,通过动态调整过程噪声协方差和观测噪声协方差,结合新息方差动态分配多传感器权重。其次,针对温湿度的强耦合性及其协同控制的需求,构建多输出长短期记忆-注意力机制(Long Short-Term Memory-Attention,LSTM-Attention)模型,以温湿度协同预测为目标,引入注意力机制自适应加权关键环境因子,并采用灰狼优化算法(Grey Wolf Optimizer,GWO)自动对超参数进行寻优。[结果和讨论]提出的自适应卡尔曼滤波算法在多点温湿度融合中的平均绝对偏差分别为1.59℃和8.64%,比传统卡尔曼滤波算法分别降低1.24%、8.57%。以该算法融合结果作为模型训练集,模型在温湿度预测中决定系数R2分别达到98.2%和99.3%,比传统Kalman提升4.7%和4.3%。GWO-LSTM-Atten⁃tion模型的温湿度预测均方根误差分别为0.7768℃和2.0564%,比LSTM、LSTM-Attention时间序列预测模型分别降低15.6%、6.6%,湿度分别降低29.2%、5.7%。[结论]提出的自适应卡尔曼融合算法能够有效抑制异常值影响,可在非平稳环境变化下实现多传感器数据可靠融合。在温室多环境因子预测中,GWO-LSTM-Attention模型温湿度预测值在未来可作为控制温室环境的重要参考,进而实现对温室环境的实时调控。
摘要Using similar single-difference methodology(SSDM) to solve the deformation values of the monitoring points, there is unstability of the deformation information series, at sometimes.In order to overcome this shortcoming, Kalman filtering algorithm for this series is established,and its correctness and validity are verified with the test data obtained on the movable platform in plane. The results show that Kalman filtering can improve the correctness, reliability and stability of the deformation information series.
摘要The standalone Global Positioning System (GPS) does not meet the higher accuracy requirements needed for approach and landing phase of an aircraft. To meet the Category-I Precision Approach (CAT-I PA) requirements of civil aviation, satellite based augmentation system (SBAS) has been planned by various countries including USA, Europe, Japan and India. The Indian SBAS is named as GPS Aided Geo Augmented Navigation (GAGAN). The GAGAN network consists of several dual frequency GPS receivers located at various airports around the Indian subcontinent. The ionospheric delay, which is a function of the total electron content (TEC), is one of the main sources of error affecting GPS/SBAS accuracy. A dual frequency GPS receiver can be used to estimate the TEC. However, line-of-sight TEC derived from dual frequency GPS data is corrupted by the instrumental biases of the GPS receiver and satellites. The estimation of receiver instrumental bias is particularly important for obtaining accurate estimates of ionospheric delay. In this paper, two prominent techniques based on Kalman filter and Self-Calibration Of pseudo Range Error (SCORE) algorithm are used for estimation of instrumental biases. The estimated instrumental bias and TEC results for the GPS Aided Geo Augmented Navigation (GAGAN) station at Hyderabad (78.47°E, 17.45°N), India are presented.
摘要针对无线传感器网络中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)定位技术易受环境影响、定位精度较低的问题,提出一种将RSSI定位过程分为测距阶段与定位阶段的双阶段优化方法。测距阶段,改进卡尔曼滤波算法以RSSI信号均值作为初始状态估计,结合网格遍历搜索优化过程噪声协方差和测量噪声协方差参数,提升卡尔曼滤波算法的适应性和滤波效果,降低测距阶段的误差;定位阶段,使用多策略改进鲸鱼优化的节点位置估计算法求解未知节点位置,进一步提高定位精度。该算法通过K-means聚类初始化策略、精英反向学习策略和随机鲸鱼学习策略,提升原始鲸鱼优化算法的全局搜索能力和收敛速度,进一步提高定位精度。实验结果表明,该双阶段优化方法在定位误差控制方面优于传统的单阶段优化策略,具备更高的定位精度与更强的环境适应能力,并在与其他对比算法的性能比较中展现出明显优势。
摘要无迹卡尔曼滤波(unscented Kalman filter,UKF)是锂离子电池荷电状态(state of charge,SOC)估计的常用算法之一。然而在实际应用中,由于受到外界环境温度变化、电池容量退化等不确定性干扰,以及非高斯过程噪声的影响,需要进一步提高算法的性能才能更有效地保证估计精度。基于此,提出一种改进的无迹卡尔曼滤波算法(PO-RUKF)。首先,在UKF中引入H∞滤波提高算法的鲁棒性,用来克服各种干扰带来的不良影响。其次,利用鹦鹉优化算法对UKF的过程噪声协方差矩阵进行自适应调整,以解决滤波噪声参数先验确定的问题,从而提高滤波精度。最后,采用马里兰大学的FUDS和HPPC工况下的两种公开数据集进行了实验验证,结果表明,在不同的温度、电池容量退化状态以及不同的工况下,相比于传统的UKF算法以及鲁棒UKF算法,改进后的算法具有更高的SOC估计精度,平均绝对误差小于0.50%,均方根误差小于0.56%,此外还展现出更强的鲁棒性和普适性。证实所提方法可以为锂离子电池SOC估计提供更可靠、有效的技术支撑。