Integrated modeling of motion decoupling and flexure deformation of carrier in transfer alignment

Abstract

In airborne distributed inertial measurement system, there are complex working environment and obvious structural deformation regards to the carrier, which make the research of transfer alignment technology more complicated. Considering the influence of dynamic deflection and coupled motion, the integrated transfer alignment model of decoupled and flexed deformation is established in the paper, which is based on the requirement of high precision navigation information at the sub antenna of airborne earth observation system. On the one hand, combined with Fiber Bragg Grating (FBG) sensor to measure the deflection of the aircraft wing, a general deflection model of the aircraft wing is established, and the accuracy of the model is verified by finite element analysis. On the other hand, the traditional airborne transfer alignment regards the motion of the carrier and the dynamic deformation of the carrier as uncorrelated motion, but there is a strong coupling between them in practice. In the paper, based on the geometric relationship between them, the coupling is solved, and the system error equation is updated. The feasibility and accuracy of the proposed transfer alignment model are verified by semi physical simulation experiments. The results show that the proposed model is faster and more accurate than the traditional transfer alignment model.