The invention relates to the technical field of
engineering measurement, in particular to a method for transmitting coordinates of planes inside and outside a tunnel based on inertial navigation in a
tunnel construction stage. The method includes: early-stage preparation; uninterruptedly collecting data along a closed
route; post
data processing is carried out, and the initial coordinates of the in-hole points in the CGCS2000 coordinate
system are calculated; the distance between point-to-point pairs in the hole is constrained and adjusted, and the
measurement precision is improved; and converting coordinates, and calculating to obtain coordinates of the in-hole point tunnel plane
engineering coordinate
system. According to the invention, inertial navigation is started by one key, data is continuously and automatically acquired, manual instrument erection and reading are not needed, manual intervention is not needed, at least three persons for cooperative operation of wire measurement are reduced to only one person, the manual
workload is reduced, and the measurement efficiency is improved; according to the method, high-precision transmission of plane coordinates inside and outside the tunnel is realized in a CPIII-free scene without depending on CPIII control points in the tunnel, so that the applicability is improved; according to the method, through
closed path design and dynamic weighted fusion, the problem of tunnel inertial navigation measurement drift in the construction period, which cannot be realized, is fundamentally solved.