Track linetype fitting method based on deflection angle abnormity compensation

The invention provides a track linetype fitting method based on deflection angle abnormity compensation, which comprises the following steps: fixedly connecting a speedometer and an inertial navigation system on a track inspection vehicle, and arranging the track inspection vehicle on a track to advance; acquiring the mileage value of the track inspection vehicle in real time by using a speedometer; acquiring position coordinates and course angle of the track inspection vehicle in real time by using an inertial navigation system; acquiring position coordinates of each mileage point of the track inspection vehicle, and acquiring a track actual measurement line type; the curvature change of the track actual measurement line type is obtained; dividing the actual measurement line type of the track into a straight line section, a circular curve section and an easement curve section based on curvature change; performing preliminary fitting on the straight line segment, the circular curve segment and the easement cu