| Citation: | PAN Xin, ZHANG Li, HE Kaiet al. Method of accuracy analysis for composite material surface measurement by lidar[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(7): 1398-1404. doi: 10.13700/j.bh.1001-5965.2019.0441(in Chinese)
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In order to meet the accuracy evaluation requirement of composite material surface measurement with lidar, this paper proposed an analysis method based on Signal to Noise Ratio (SNR) of lidar echo signals. By evaluating the detection results, the deformation results after the demolding can be obtained accurately, which is conducive to achieving the repairs of composite material mold. This method considers the influence of measurement distance, incident angle and material property on the results in measurement engineering. And the relationship between echo signal SNR and measurement accuracy in lidar measurement process is studied. Combined with SNR variation law and instrument uncertainty, the accuracy correction factor can be determined in different areas of measurement point-cloud. Finally, this method is used to realize measurement accuracy analysis of large-scale composite material surface deformation measurement results by lidar, which reduces the influence of the measurement error on deformation. This method can accurately evaluate the accuracy of measurement results and obtain the true deformation amount of composite material surface.
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