Spatial load relative pose on-orbit measurement implementation method and system

The invention provides a spatial load relative pose on-orbit measurement realization method and system, and the method is mainly and technically characterized in that two laser scanning measurement instruments are used for respectively measuring the center three-dimensional coordinates of corner reflectors at a plurality of feature points, and a local coordinate system relative to the two laser scanning measurement instruments is established; the relative pose relation between the two laser scanning measuring instruments is obtained through the common reference point, all local coordinate systems are unified to the coordinate system of any laser scanning measuring instrument, and finally all the coordinate systems are unified to the reference coordinate system through a rotation matrix and a translation matrix. And obtaining a position and attitude change relationship between the load reference and the effective load. The method mainly solves the problem of measuring the position and attitude change relation