Research on Dynamic Inertial Estimation Technology for Deck Deformation of Large Ships

Abstract

Many kinds of weapon systems and launching equipment on the deck of large ships are easily affected by deck deformation. In order to ensure the accuracy of weapon systems and the safety of taking off and landing of carrier aircraft, a dynamic estimation method combining the main inertial navigation systems (INS) and the sub-inertial navigation systems (SINS) is designed to estimate the curvature and torsion of any trajectory on the deck. Our contributions start from the fact that the area of concern extends from the fixed points to any trajectory on the deck. The dynamic filter algorithm of wavelet combined with Kalman filter is used to process the acquired data. The wavelet method is used to remove the outliers in the acquired data, and the Kalman filter effectively reduces the influence of white noise, so that the estimation accuracy is guaranteed. The simulation results clearly show that the deck deformation of large ships can be obtained accurately in real-time over the observed area which proved that this dynamic inertial measurement method is feasible in practical engineering application.

A hull deformation measurement method based on fiber optic gyro angular rate matching in complex sea conditions

“…The benchmark error has become one of the main reasons to limit the accuracy of shipboard equipments. 3 For currently feasible hull deformation measurement methods, due to the limitation of measurement methods and installation conditions, optical and photographic measurement methods have not been widely used for real-time measurement and compensation under actual ship sailing conditions, 4 while measuring the hull deformation with inertial devices has become an important development direction of the current hull deformation measurement technology. The inertial measurement method is to install two inertial measurement units (IMUs) at the equipment installation location and the ship's swing center respectively.…”