STARLIGHT ATMOSPHERIC REFRACTION MEASUREMENT CORRECTION METHOD BASED ON COLLINEARITY OF REFRACTION SURFACES

摘要

A starlight atmospheric refraction measurement correction method based on collinearity of refraction surfaces, comprising: performing star pattern recognition on the basis of observed fixed star vectors in a star sensor and a reference star catalog, to obtain matching relationships between observed stars and reference stars; converting reference star vectors corresponding to the observed stars to a geographic coordinate system before entering the atmosphere to obtain zenith distances and azimuth angles of incident star light; on the basis of a principle of collinearity of refraction surfaces, performing optimal solving according to imaging coordinates of all fixed stars obtained by star pattern recognition and azimuth angles thereof before entering the atmosphere, to obtain position coordinates of the zenith direction on an imaging surface of the star sensor; according to the obtained position coordinates of the optimal zenith direction on the imaging surface, performing atmospheric refraction correction on all the recognized observed fixed star image surface coordinates by means of a trigonometric cosine formula to obtain corrected fixed star coordinates; and performing solving to obtain the attitude of the star sensor in the geographic coordinate system.