This invention belongs to the field of tunnel detection technology and provides a method and
system for identifying tunnel structural defects based on multispectral sensing and SLAM. Based on
multiple response timestamp data, a residual squared sum objective function is constructed to represent the difference between the theoretically predicted
clock vector and the actual measured
timestamp matrix. Through iterative optimization, the optimal smooth estimate of the
clock drift rate is determined, reducing the combined effects of
electromagnetic interference and temperature /
humidity variations. A three-dimensional
point cloud map is constructed based on the
coupling of axial integrals of inertial data and radial constraints of
laser data, achieving long-distance, high-precision passive positioning under tunnel corridor effects. Furthermore, a lightweight identification model using a multidimensional knowledge
distillation architecture and geometrically guided fraction fusion reduces edge memory consumption. By combining the reduction of
electromagnetic interference and temperature /
humidity variations, overcoming positioning drift under the dual constraints of corridor effects, and breaking through
edge computing power limitations, the tunnel defect identification effect is improved.