The Method of the Calibration of the Base Points in the Laser Tracking 3D Coordinates Measuring System

In the laser tracking 3D coordinates measuring system,the self-calibration should be made before measurement that would take effect mostly on the result.In order to enhance the calibration accuracy,a new method of calibrating the base points coordinates is proposed.Two laser interferometers were employed on the linear principle to measure the 3D coordinates of the base point.Furthermore the optimization distributions of the base points and the target points are analyzed.Simulation result shows that when the target points are distributed symmetrically relative to the base point,the measuring accuracy of the base point coordinates is 6 or 7 times higher than that is measured in asymmetry distribution.The base point coordinates are derived by the experiments.