Real Time Estimating of the Ship Flexure

A properly compensating the corrupting influence of ship flexure is a key issue for the dynamic shipboard alignment, thus it is necessary to estimate the effect of ship flexure in real time. In this paper, an approach to on-line modeling of the ship flexure is investigated. For on-line modeling of the ship flexure with inertial measurement units (IMU) data, a method for extracting the ship flexure information from IMU data is firstly presented. Then an algorithm for identifying the required ship flexure model parameters is derived by using the correlation method. Simulation results show a good agreement between the estimated model parameters and its true values, and well stability and robustness of the proposed algorithm under the representative sea conditions.