Abstract: In response to the problems of low efficiency,dependence on CPⅢ control network,poor environmental adaptability,and error divergence in traditional track measurement technology,this paper proposes a rapid measurement of track alignment based on inertial navigation with multi-source information constraints.Integrating multiple sensors such as BeiDou,INS,gauge sensors,odometry,etc.,a time synchronization mechanism for each sensor is designed.Data acquisition software is developed.BeiDou fixed point coordinate fitting,track alignment information constraint,and 3D reconstruction algorithm are constructed.Multi source information fusion and inertial navigation error suppression are achieved.Tests have shown that the absolute measurement accuracy of the track can reach 10 mm,the relative measurement accuracy of short wave is better than 0.3 mm,and the long wave is better than 3 mm.This system breaks through the bottleneck of traditional technology,meets the requirements of precise track measurement,and provides a new solution for the intelligent development of track measurement.

Key words: inertial integrated navigation, BeiDou positioning, multi source information constraints, track measurement