Adjustment of a Laser Interferometer 3D Rank-defect Free-network

In this research,the precise laser interferometer range of laser tracker alone is used to structure 3D trilateration network，so angular error is removed. The adjustment model is the weighted rank defect free-network and the adjustment datum is an areal datum.The approximation parameter of the orientation point coordinates is calculated with angle and distance，and a trilinear surveying method is used to get approximate station coordinates.Moreover，the station and orientation points were calculated precisely using an additional constrained matrix.The results show that the 3D trilateration net-work adjustment model can substantially raise point accuracy.