Self-calibrating method of two-dimensional large-stroke precision workbench measuring system

The invention relates to a self-calibrating method of a two-dimensional large-stroke precision workbench measuring system and belongs to the field of precision machining and measurement. The self-calibrating principle is utilized for the method, a glass plate with even grids is used as an auxiliary measuring device, a two-dimensional workbench is self-calibrated respectively according to areas, and system errors of all the areas are obtained; system error compensation is performed on the corresponding areas, and coordinates of discrete points in calibration coordinate systems are obtained; linear fitting is performed on the coordinates of the discrete points in all the areas, and grids of the calibration coordinate systems are obtained; on the basis of the coordinate system transformation principle, the calibration coordinate systems of the adjacent areas are transformed, a unified calibration coordinate system in the whole area is obtained, and finally the two-dimensional large-stroke precision workbench measuring system can be self-calibrated. Through the self-calibrating method, large-stroke and high-precision self-calibration of the two-dimensional workbench is achieved, and meanwhile the function of calibrating the high-precision two-dimensional workbench through the low-precision grid glass plate is achieved. A high-precision calibrating tool is not needed, and the self-calibrating method is high in calibration precision and suitable for calibrating various two-dimensional precision workbenches.