Ms. Rong Li Profile

Rong Li

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Proceedings Article | 4 December 2024 Paper

Point cloud segmentation method of satellites based on improved DGCNN

Xiaoyu Zhang, Laixian Zhang, Yingchun Li, Houpeng Sun, Rong Li

Proceedings Volume 13283, 132831D (2024) https://doi.org/10.1117/12.3034940

KEYWORDS: Point clouds, Satellites, Convolution

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Using the satellite characterization information obtained by the space-based platform, the key parts of the satellite, such as solar panels, satellite payload, and propulsion systems, are segmented. The target object segmented from the point cloud data is significant to improve the accuracy of subsequent point cloud registration and attitude recognition. In this study, we introduced TSNet, which has the following characteristics. 1) The continuous recursive gate convolution module (g_nConv) is introduced into the network, which can improve the accuracy of point cloud segmentation. 2) The weight channel for feature transfer is designed to avoid global information loss. The mIoU value of TSNet laser point cloud segmentation reached 88.12%, which was better than common point cloud segmentation algorithms, such as PointNet, PointNet++ and DGCNN. The proposed method can provide more accurate perception information for ground control personnel.

Proceedings Article | 30 April 2024 Paper

Design of semiconductor laser beam zooming and shaping system based on aspheric lens group

Rong Li, Haijing Zheng, Huichao Guo, Yingchun Li, Huaili Zhang, Laixian Zhang

Proceedings Volume 13156, 131560T (2024) https://doi.org/10.1117/12.3016482

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This paper presents a zooming and shaping system for a semiconductor laser beam based on aspheric lens group. Firstly, a theoretical model for transforming Gaussian beam into flat-top beam is established from Gaussian beam model and flattop beam model. Secondly, using the model and the derived mapping function formula, the shaping system is automatically optimized with optical design software to realize the conversion from Gaussian beam to flat-top beam. Finally, a zooming optical path with aspheric lens group is designed by optical design software to achieve laser beam zooming and shaping, and a surface type equation with machinability is obtained. Research results: The designed optical system forms a relatively uniform spot in far field, such as 500m, and the divergence angle can achieve continuous change of 8-32mrad. The research results have certain reference value and guiding significance for the shaping and homogenization design of semiconductor laser beam.

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