Journal of System Simulation ›› 2024, Vol. 36 ›› Issue (8): 1790-1799.doi: 10.16182/j.issn1004731x.joss.24-0195

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Parametric Identification of Ship Maneuvering Motion Response Model Based on Square Root Cubature Kalman Filtering

Li Qinghao, Ren Junsheng, Hua Yan   

  1. Nautical Dynamic Simulation and Control Key Laboratory, Dalian Maritime University, Dalian 116026, China
  • Received:2024-03-05 Revised:2024-04-30 Online:2024-08-15 Published:2024-08-19
  • Contact: Ren Junsheng

Abstract:

The system identification algorithm, based on the square root cubature Kalman filter (SRCKF)is proposed to address issues such as low accuracy, poor robustness, and weak generalization ability encountered by the extended Kalman filter (EKF) algorithm in parameters identification of ship maneuvering motion models. This algorithm, within the framework of CKF, replaces the original covariance matrix with its root mean square and utilizes triangular decomposition for prediction and update to enhance identification stability. The EKF is used as a comparison algorithm to identify the parameters of the second-order nonlinear response model of a ship with rudder angles that comply with changes in the rudder servo system using the numerical simulation data solved by the fourth-order Lunger Kuta method, and the obtained identification model is subjected to a verification test of the generalisation ability. The results indicate that the SRCKF algorithm has higher identification accuracy, stability, and generalization ability than the EKF algorithm.

Key words: parameters identification, SRCKF(square root cubature Kalman filter), fourth-order Runge-Kutta method, rudder servo system, response model

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