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.

在传统的船体变形测量方法中，外部测量噪声被认为是恒定的。但由于海况复杂，海浪引起的高频颤动，测量噪声为有色噪声。本文的目的是开发一种基于光纤陀螺（FOG）角速率匹配的复杂海况下船体变形测量方法。一方面，对传统系统模型进行优化降维，提出一种简化的线性状态空间模型。另一方面，设计了有限脉冲响应（FIR）低通数字滤波器并将其引入角速率匹配测量方法中，使得在复杂海况下仍能保持变形估计精度。设计仿真和摆台试验来验证本文提出的船体变形测量方法的有效性。结果表明，本文提出的方法能够有效消除外部噪声干扰，提高估计精度。