Method for correcting projection distortion of off-axis concave parabolic mirror

The invention discloses a method for correcting projection distortion of an off-axis concave parabolic mirror, and the method comprises the steps: constructing a curved surface equation of a to-be-corrected off-axis concave paraboloid under a mother mirror coordinate system according to the basic parameters of the to-be-corrected off-axis concave paraboloid; in an auto-collimation detection light path of the off-axis concave paraboloid to be corrected by using the aberration-free point method, calculating a coordinate transformation relation from a CCD projection plane to the off-axis concave paraboloid to be corrected; linearly transforming pixel points on the off-axis concave paraboloid to be corrected to a CCD projection plane to obtain projection plane coordinate data; and performing coordinate transformation on the projection plane coordinate data according to the coordinate transformation relation, and performing interpolation processing on the data after coordinate transformation. According to the meth