Ship deformation measurement based on angular rate matching method and Quasi-static model

Angular matching method was used to measure ship’s deformation, three-axis fiber optic gyroscope units(FGU) are installed on various point of the ship, based on the model advanced by Mochalov, considering the character of ship’s static deforming angle varies, a quasi-static model was established, Kalman filter was introduced to estimate the ship’s quasi-static and dynamic deforming angles. To make the estimation more precise, gyro drifts was taking into account. Besides the theory simulation, practical experiment in sea area is also carried out, which lays the firm foundation for actual application of ship deformation measurement based on three-axis fiber optic gyroscope.

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Investigation on coupling error characteristics in angular rate matching based ship deformation measurement approach

2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems ◽

10.1117/12.2295294 ◽

2018 ◽

Author(s):

Shuai Yang ◽

Wei Wu ◽

Xingshu Wang ◽

Zhiguang Xu

Keyword(s):

Angular Rate ◽

Deformation Measurement ◽

Error Characteristics ◽

Coupling Error ◽

Measurement Approach

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Angular rate matching method for shipboard transfer alignment based on H∞ filter

2011 6th IEEE Conference on Industrial Electronics and Applications ◽

10.1109/iciea.2011.5975660 ◽

2011 ◽

Author(s):

Shen Xiaorong ◽

Shi Yongzhu

Keyword(s):

Angular Rate ◽

Matching Method ◽

Transfer Alignment

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

Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment ◽

10.1177/14750902211033264 ◽

2021 ◽

pp. 147509022110332

Author(s):

Yao Li ◽

Di Wang ◽

Jinwu Tong

Keyword(s):

Measurement Method ◽

Fiber Optic ◽

Finite Impulse Response ◽

Angular Rate ◽

External Noise ◽

Deformation Measurement ◽

Measurement Noise ◽

Estimation Accuracy ◽

Fiber Optic Gyro ◽

Traditional System

In the conventional hull deformation measurement method, the external measurement noise is considered constant. However, due to the complex sea conditions and the high-frequency chatter caused by the waves, the measurement noise is colored noise. The aim of this paper is to develop a hull deformation measurement method based on fiber optic gyro (FOG) angular rate matching in complex sea conditions. On the one hand, the traditional system model is optimized to reduce the dimension, and a simplified linear state space model is proposed. On the other hand, a finite impulse response (FIR) low-pass digital filter is designed and introduced into the angular rate matching measurement method, so that the deformation estimation accuracy can still be maintained in complex sea conditions. The simulation and swing table test are designed to verify the effectiveness of the hull deformation measurement method proposed in this paper. The results show that the proposed method in this paper can effectively eliminate external noise interference and improve estimation accuracy.

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