Self-calibration Algorithm for Laser Multilateral Coordinate Measurement System Using Standard Length Method
ZHENG Ji-hui1,MIAO Dong-jing2,LI Jian-shuang2,XU Zhi-ling1, HE Ming-zhao2,LI Lian-fu2
1.Collage of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2.National Institute of Metrology, Beijing 100029, China
Abstract：The coordinate measuring system based on laser multilateral tracking method has remarkable superiority in the large scale measurement filed,and the accurate calibration of system parameters is the key to achieve high-precision coordinate measurement.To overcome the shortcomings of the traditional calibration method,an improved self-calibration algorithm by using standard length is proposed. Firstly,a number of fixed points are set in the stable base,and the accurately standard lengths along X,Y,Z directions are measured using laser interference method respectively.Then the standard lengths are used to constructed self-calibration optimization functions.By increasing the weight of the corresponding optimization function, the coordinates measurement accuracy is improved further.The feasibility of the algorithm is verified through simulation experiments.Also,the actual experiments are conducted to verify the measurement accuracy of the developed system in large scale range.By comparing with independent laser interferometer measurement results, the error of two groups are distributed in the［-9.5 μm, 4.6 μm］ range as the distances between the compared points to the origin of the coordinate measure system are distributed in the［7.0 m,8.3 m］ interval. The results show that the measurement accuracy of large scale coordinate significantly is improved by the proposed self-calibration algorithm.
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2019, Vol. 40 
