Space-ray-tracing-based method for designing secondary mirror hood and square-tapered extinction cone

The invention relates to a space-ray-tracing-based method for designing a secondary mirror hood and a square-tapered extinction cone. The method comprises: step one, establishing a Cartesian rectangular coordinate system used during a design process; step two, establishing auxiliary light in a meridian plane and a sagittal surface and carrying out calculation to obtain a boundary of a square-tapered main mirror central-hole extinction cone; step three, determining the position and configuration of the tail end of the square-tapered main mirror central-hole extinction cone; step four, definingan initial structure of a secondary mirror hood; step five, constructing a spatial auxiliary ray and carrying out calculation to obtain the position and configuration of the front end of a square-tapered extinction cone; step six, setting a point light source set at the edge of a conical surface, carrying out ray tracing, carrying out statistics of light source numbers with light leakage possibility, and increasing the si