Solar radio burst(SRB)is one of the main natural interference sources of Global Positioning System(GPS)signals and can reduce the signal-to-noise ratio(SNR),directly affecting the tracking performance of GPS receivers...Solar radio burst(SRB)is one of the main natural interference sources of Global Positioning System(GPS)signals and can reduce the signal-to-noise ratio(SNR),directly affecting the tracking performance of GPS receivers.In this paper,a tracking algorithm based on the adaptive Kalman filter(AKF)with carrier-to-noise ratio estimation is proposed and compared with the conventional second-order phase-locked loop tracking algo-rithms and the improved Sage-Husa adaptive Kalman filter(SHAKF)algorithm.It is discovered that when the SRBs occur,the improved SHAKF and the AKF with carrier-to-noise ratio estimation enable stable tracking to loop signals.The conven-tional second-order phase-locked loop tracking algorithms fail to track the receiver signal.The standard deviation of the carrier phase error of the AKF with carrier-to-noise ratio estimation out-performs 50.51%of the improved SHAKF algorithm,showing less fluctuation and better stability.The proposed algorithm is proven to show more excellent adaptability in the severe envi-ronment caused by the SRB occurrence and has better tracking performance.展开更多
Satisfactory results cannot be obtained when three-dimensional (3D) targets with complex maneuvering characteristics are tracked by the commonly used two-dimensional coordinated turn (2DCT) model. To address the probl...Satisfactory results cannot be obtained when three-dimensional (3D) targets with complex maneuvering characteristics are tracked by the commonly used two-dimensional coordinated turn (2DCT) model. To address the problem of 3D target tracking with strong maneuverability, on the basis of the modified three-dimensional variable turn (3DVT) model, an adaptive tracking algorithm is proposed by combining with the cubature Kalman filter (CKF) in this paper. Through ideology of real-time identification, the parameters of the model are changed to adjust the state transition matrix and the state noise covariance matrix. Therefore, states of the target are matched in real-time to achieve the purpose of adaptive tracking. Finally, four simulations are analyzed in different settings by the Monte Carlo method. All results show that the proposed algorithm can update parameters of the model and identify motion characteristics in real-time when targets tracking also has a better tracking accuracy.展开更多
准确估计蓄电池荷电状态(state of charge,SOC)对于蓄电池的健康管理具有重要意义。现有SOC估算方法普遍存在复杂性高、自适应较弱的问题,更偏重于理论分析,难以满足实际在线监测的应用场景。为提高SOC估算过程的自适应性以及降低算法...准确估计蓄电池荷电状态(state of charge,SOC)对于蓄电池的健康管理具有重要意义。现有SOC估算方法普遍存在复杂性高、自适应较弱的问题,更偏重于理论分析,难以满足实际在线监测的应用场景。为提高SOC估算过程的自适应性以及降低算法应用的复杂性,提出了一种适用于在线监测应用场景的基于蜣螂优化算法和自适应无迹卡尔曼滤波的SOC估计算法。将二阶Thevenin等效电路作为蓄电池的模型,利用蜣螂优化算法对该模型的关键参数进行自适应辨识,根据所辨识的参数,利用自适应无迹卡尔曼滤波算法对SOC进行估算。为了验证该算法的有效性,利用锂离子电池不同动态工况的实验数据进行了测试。实验结果表明,在初始参数设置模糊或不准确的情况下,该算法依然能够自适应地获取精度更高的SOC估计结果,具有更好的鲁棒性。展开更多
基金supported by the Foundation of Key Laboratory of Micro-inertial Instrument and Advanced Navigation Technology,Ministry of Education,Chinathe National Natural Science Foundation of China (61873064)
文摘Solar radio burst(SRB)is one of the main natural interference sources of Global Positioning System(GPS)signals and can reduce the signal-to-noise ratio(SNR),directly affecting the tracking performance of GPS receivers.In this paper,a tracking algorithm based on the adaptive Kalman filter(AKF)with carrier-to-noise ratio estimation is proposed and compared with the conventional second-order phase-locked loop tracking algo-rithms and the improved Sage-Husa adaptive Kalman filter(SHAKF)algorithm.It is discovered that when the SRBs occur,the improved SHAKF and the AKF with carrier-to-noise ratio estimation enable stable tracking to loop signals.The conven-tional second-order phase-locked loop tracking algorithms fail to track the receiver signal.The standard deviation of the carrier phase error of the AKF with carrier-to-noise ratio estimation out-performs 50.51%of the improved SHAKF algorithm,showing less fluctuation and better stability.The proposed algorithm is proven to show more excellent adaptability in the severe envi-ronment caused by the SRB occurrence and has better tracking performance.
基金supported by the National Natural Science Foundation of China(51467013)
文摘Satisfactory results cannot be obtained when three-dimensional (3D) targets with complex maneuvering characteristics are tracked by the commonly used two-dimensional coordinated turn (2DCT) model. To address the problem of 3D target tracking with strong maneuverability, on the basis of the modified three-dimensional variable turn (3DVT) model, an adaptive tracking algorithm is proposed by combining with the cubature Kalman filter (CKF) in this paper. Through ideology of real-time identification, the parameters of the model are changed to adjust the state transition matrix and the state noise covariance matrix. Therefore, states of the target are matched in real-time to achieve the purpose of adaptive tracking. Finally, four simulations are analyzed in different settings by the Monte Carlo method. All results show that the proposed algorithm can update parameters of the model and identify motion characteristics in real-time when targets tracking also has a better tracking accuracy.
文摘准确估计蓄电池荷电状态(state of charge,SOC)对于蓄电池的健康管理具有重要意义。现有SOC估算方法普遍存在复杂性高、自适应较弱的问题,更偏重于理论分析,难以满足实际在线监测的应用场景。为提高SOC估算过程的自适应性以及降低算法应用的复杂性,提出了一种适用于在线监测应用场景的基于蜣螂优化算法和自适应无迹卡尔曼滤波的SOC估计算法。将二阶Thevenin等效电路作为蓄电池的模型,利用蜣螂优化算法对该模型的关键参数进行自适应辨识,根据所辨识的参数,利用自适应无迹卡尔曼滤波算法对SOC进行估算。为了验证该算法的有效性,利用锂离子电池不同动态工况的实验数据进行了测试。实验结果表明,在初始参数设置模糊或不准确的情况下,该算法依然能够自适应地获取精度更高的SOC估计结果,具有更好的鲁棒性。
