Identification of inner parameters in laser radar measuring system through system error analysis

摘要

This paper concerns the study of error modeling and inner parameter identification of 3D laser radar measuring system (LRMS) equipped with 2D laser sensor and electric servo motor, for the potential application of on-site measurement of the heavy forging object with temperature as high as 1000.Firstly the physical and geometric model of 3D laser radar measuring system is presented. Detail discussion about the deterministic error and random error of the measuring system is conducted. Consequently the discipline of the deterministic error and the variation laws of random errors are achieved by the nonlinear equations set through the coordinate transformation. Finally based on the above discuss the identification method of inner geometrical parameter of the measuring system is presented by using the local linearization for nonlinear equations with Tailor Series Expansion Formula and the Least Square Algorithm. Therefore its measuring accuracy has been improved significantly. The results show this calibration method is helpful to the similar application of other measuring systems.