Liu Yanhong, Huang Yan, Yao Hejun, Liang Wei, Xu Yuan
Beijing Institute of Metrology, Beijing 100029, China.
National Metrology Center for Industry of GNSS, Beijing 100029, China.
Heliyon. 2023 Apr 29;9(5):e15932. doi: 10.1016/j.heliyon.2023.e15932. eCollection 2023 May.
The airborne distributed Position and Orientation System (POS) is a key piece of equipment for providing high-precision motion parameters for aerial remote sensing systems. However, wing deformation degrades the performance of distributed POS, thus, it is urgent to obtain high-precision deformation information to assist distributed POS. In this study, a modeling and calibrating method of fiber Bragg grating (FBG) sensors for wing deformation displacement measurement is proposed. First, based on the cantilever beam theory and piecewise superposition, a modeling and calibrating method for wing deformation displacement measurement is established. The wing is then placed under different deformation conditions, and the changes in the wing deformation displacement and corresponding wavelength variations of the pasted FBG sensors are obtained using theodolite coordinate measurement system and FBG demodulator, respectively. Subsequently, linear least square fitting is deployed to develop the relationship model between the wavelength variations of the FBG sensors and wing deformation displacement. Finally, the wing deformation displacement at the measuring point in the temporal and spatial dimensions is obtained by fitting and interpolation. An experiment is conducted, and the results show that the accuracy of the proposed method can reach 0.721 mm with a wing length of 3 m, which can be used in the motion compensation of an airborne distributed POS.
机载分布式位置与姿态测量系统（POS）是为航空遥感系统提供高精度运动参数的关键设备。然而，机翼变形会降低分布式POS的性能，因此，迫切需要获取高精度变形信息以辅助分布式POS。在本研究中，提出了一种用于机翼变形位移测量的光纤布拉格光栅（FBG）传感器建模与校准方法。首先，基于悬臂梁理论和分段叠加，建立了机翼变形位移测量的建模与校准方法。然后将机翼置于不同变形条件下，分别使用经纬仪坐标测量系统和FBG解调器获取机翼变形位移的变化以及粘贴的FBG传感器相应的波长变化。随后，采用线性最小二乘法拟合建立FBG传感器波长变化与机翼变形位移之间的关系模型。最后，通过拟合和插值获得测量点在时间和空间维度上的机翼变形位移。进行了实验，结果表明，在机翼长度为3 m时，该方法的精度可达0.721 mm，可用于机载分布式POS的运动补偿。
