Method and system for improving fringe contrast ratio through fixed star light interference wavefront detection

The invention discloses a method and a system for improving fringe contrast through fixed star light interference wavefront detection. The method comprises the following steps: simulating a starlight source and simulating atmospheric turbulence information; simulating phase screen information of starlight passing through atmospheric turbulence and a telescope, performing interference processing, analyzing an interference result, and calculating an interference contrast; compensating by using a deformable mirror based on low-order adaptive optics, simulating phase screen information of starlight passing through atmospheric turbulence, a telescope and the deformable mirror and performing interference processing, performing interference processing on phase information corrected by using the deformable mirror, analyzing an interference result and calculating an interference contrast; comparing the contrast ratios of two times of interference, and improving the fringe contrast ratio by using deformable mirror phas