Ye Wen, Gu Bin, Wang Yun
Division of Mechanics and Acoustic Metrology, National Institute of Metrology, Beijing 100029, China.
China Academy of Electronics and Information Technology, Beijing 100041, China.
Sensors (Basel). 2020 Apr 9;20(7):2120. doi: 10.3390/s20072120.
With the demand for high resolution remote sensing, load array technology has gradually become an effective measure to improve imaging resolution. However, the external flow and internal engine vibration disturbance may lead to the flexible deformation of wings. The traditional rigid baseline error compensation method cannot solve the problem of serious coupling movement error caused by flexible deformation. To address the problem, a transfer alignment model based on fiber Bragg grating for distributed position and orientation system is proposed in this paper. Firstly, based on the multidimensional requirements of flexible deformation information, the layout scheme of fiber Bragg grating was designed, then the continuous strain in the wing surface was obtained after the quadratic fitting of strain measured by fiber Bragg gratings, and the deformation displacement and angle are calculated. Thirdly, flexible deformation compensation for distributed position and orientation system based on fiber Bragg grating was studied. The state equation including position error, velocity error, misalignment angle, and inertial device error was established. The position and attitude information compensated by the flexible lever arm was used as the quantitative measurement. The filtering estimation improved the measurement accuracy of the slave inertial navigation systems. At last, the experiment was carried out and showed that the accuracy of the transfer alignment has been improved significantly.
随着对高分辨率遥感的需求，负载阵列技术逐渐成为提高成像分辨率的有效措施。然而，外部气流和发动机内部振动干扰可能导致机翼发生柔性变形。传统的刚性基线误差补偿方法无法解决由柔性变形引起的严重耦合运动误差问题。针对该问题，本文提出了一种基于光纤布拉格光栅的分布式位置和姿态系统传递对准模型。首先，基于柔性变形信息的多维需求，设计了光纤布拉格光栅的布局方案，然后对光纤布拉格光栅测量的应变进行二次拟合后得到机翼表面的连续应变，并计算出变形位移和角度。第三，研究了基于光纤布拉格光栅的分布式位置和姿态系统的柔性变形补偿。建立了包含位置误差、速度误差、失准角和惯性器件误差的状态方程。将由柔性杆臂补偿后的位置和姿态信息作为定量测量。通过滤波估计提高了从惯性导航系统的测量精度。最后进行了实验，结果表明传递对准的精度有了显著提高。
