Orientation parameters calibration of wMPS by using precise 3D coordinate control network

The wMPS was a 3D coordinate system based on laser scanning, which was widely applied in larg-scale metrology. The orientation parameters calibration was the critical technique of the system as it could solve the problem between the large measurement scale and high accuracy. This paper focused on a novel orientation parameter calibration method by using high precise thre-dimensional coordinate control network after the mathematic model of the system was stated. Several calibration points with known coordinates were set in the workspace to establish the precise 3D coordinate control network. After the novel model of orientation parameters calibration had been explained, both calculation method for optimization and the produce of the initial iteration value were given. As indicated by the results of the verifying experiment, the accuracy and efficiency of the orientation calibration could be distinctly improved by using the proposed method. The experimental data show that the 3D coordinate measurement error is less than 0.15 mm as a merit of the proposed method.