Two-dimensional position precision calibration method and system for inertial navigation system of heading machine

The invention discloses a two-dimensional position precision calibration method and system for an inertial navigation system of a heading machine. The method comprises the steps of determining a reference direction, setting a total station in a designated position by taking the reference direction as a reference, and meanwhile, controlling the heading machine to move at a preset speed in a designated direction; arranging a feature point on the heading machine, and controlling the total station to collect first two-dimensional plane position coordinates of the feature point at a preset time point, and meanwhile controlling the inertial navigation system of the heading machine to collect second two-dimensional plane position coordinates of the heading machine at the same time point as the total station; and performing data analysis by analyzing the first two-dimensional plane position coordinates and the second two-dimensional plane position coordinates, and evaluating the two-dimensional positioning precision