Method for measuring tunneling construction precision at two ends of extra-long tunnel

The invention discloses a method for measuring tunneling construction precision at two ends of an extra-long tunnel. The method comprises the following steps: rechecking and encrypting mapping base points arranged in the whole route according to the present coordinate control point and benchmark data; using double-frequency receivers for collecting field data of horizontal control points, and synchronously starting up and collecting satellite signals under the condition of strictly centering and leveling; synchronously observing at different horizontal control points by multiple receivers, moving to other horizontal control points for synchronously observing after finishing the synchronous observation in a period of time, and forming a synchronous pattern while synchronously observing at each time. During the measuring process, different synchronous patterns are generally connected by a plurality of common points; the whole GPS network is formed by the synchronous patterns; measuring points are uniformly dist