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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Jinxu Zhang Liheng Shi Yingying Gu Donglai Zhang Lu Yin Guanhao Wu Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing China National Key Laboratory of Space Intelligent Control China Academy of Space Technology Beijing China

We present a one-shot 3D spectral interferometry technique using a digital micromirror device. By encoding the distribution of the spatial light field, this approach enables 3D imaging of step structures within 27 ms.

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Optical interferometry Three-dimensional displays Imaging Surface emitting lasers measurement by laser beam Encoding Microcavities

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Crater Identification Simulation Using Lidar on Lunar Rover

SSRN

引用

SSRN 2022年

作者： Zhou, Yier Li, Xiaolu Hua, Baocheng School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Lab of Space Optoelectronic Measurement & Perception Beijing Institute of Control Engineering Beijing100191 China

Crater identification is an important task of environment perception, which is benefit for path planning and safe campaign of Lunar rover. To overcome the partial missing of point cloud obtained by LiDAR, a three-dimensional data-based crater identification method is proposed to complete the crater, which can be evaluated by completion rate and detectivity probability. To obtain a reasonable identification of the craters, three parameters are varied for evaluating the consequence of crater identification: the terrain frequency, the ranging errors and the angle errors. The simulation experimental results show that the proposed method achieves the completion rate of exceeding 84.18%, and the detectivity probability more than 80.58%, when the conditions of terrain and LiDAR sensor are satisfied as terrain frequency higher than 20m-1, the ranging error lower than 0.07m and the vertical angle error lower than 0.3°. This three-dimensional environment perception simulation for crater identification will be instructive for Lunar exploration. © 2022, The Authors. All rights reserved.

关键词： Lunar missions

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Reconstructing Three-Degree-of-Freedom Pose through Temporal Phase-Shifted Low-Coherence Spatial Interferograms

Reconstructing Three-Degree-of-Freedom Pose through Temporal...

引用

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Liheng Shi Jinxu Zhang Yingying GU Fangqin Gai Jing Liu Guanhao Wu Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Research Center of Opto-electronic Sensing Yangtze Delta Region Institute of Tsinghua University Zhejiang Zhejiang China Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing China National Key Laboratory of Space Intelligent Control China Academy of Space Technology Beijing China

We introduce a method for measuring three degrees of freedom using low-coherence light and temporal phase-shifting to discern position and orientation from the coherence envelope shape, enabling direct measurement wit... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Phase measurement Shape Shape measurement measurement by laser beam Coherence Position measurement Lasers and electrooptics

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Star Image Simulation for Starlight Refraction Sensor

Star Image Simulation for Starlight Refraction Sensor

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IEEE International Conference on Signal and Image Processing (ICSIP)

作者： Qing Xu Chunhui Zhao Xiao Li Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing China

ISBN: (纸本)9781665446006

The indirectly sensing horizon technique of starlight refraction utilizes star sensors to detect refracted starlight under the Earth's atmospheric limb background to achieve high precision attitude and position measurement of satellites. As star images usually can't be obtained in real time, software star image simulation is a quick and easy to implement approach for star identification algorithm validation. This paper firstly introduces the basic theory of starlight atmospheric refraction navigation. Then the atmospheric limb background radiation model and stellar radiation model of starlight refraction sensor are established. On this basis, the process of refraction star image simulation is discussed in detail. According to the given star sensor parameters and simulated radiation data, an example of refraction star image simulation is realized and the offset image coordinates of the refracted stars are analyzed for verification.

关键词： Image sensors Satellites Atmospheric measurements Atmospheric modeling Software algorithms Position measurement Satellite navigation systems

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A microwave photonic prototype for concurrent radar detection and spectrum sensing over an 8 to 40 GHz bandwidth

arXiv

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arXiv 2024年

作者： Shi, Taixia Liang, Dingding Wang, Lu Li, Lin Guo, Shaogang Gao, Jiawei Li, Xiaowei Lin, Chulun Shi, Lei Ding, Baogang Liu, Shiyang Yang, Fangyi Jiang, Chi Chen, Yang Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic Engineering East China Normal University Shanghai200241 China Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering Beijing100190 China Shanghai Lujie Communication Technology Company Limited Shanghai201613 China

In this work, a microwave photonic prototype for concurrent radar detection and spectrum sensing is proposed, designed, built, and investigated. A direct digital synthesizer and an analog electronic circuit are integrated to generate an intermediate frequency (IF) linearly frequency-modulated (LFM) signal with a tunable center frequency from 2.5 to 9.5 GHz and an instantaneous bandwidth of 1 GHz. The IF LFM signal is converted to the optical domain via an intensity modulator and then filtered by a fiber Bragg grating (FBG) to generate only two 2nd-order optical LFM sidebands. In radar detection, the two optical LFM sidebands beat with each other to generate a frequency-and-bandwidth-quadrupled LFM signal, which is used for ranging, radial velocity measurement, and imaging. By changing the center frequency of the IF LFM signal, the radar function can be operated within 8 to 40 GHz. In spectrum sensing, one 2nd-order optical LFM sideband is selected by another FBG, which then works in conjunction with the stimulated Brillouin scattering gain spectrum to map the frequency of the signal under test to time with an instantaneous measurement bandwidth of 2 GHz. By using a frequency shift module to adjust the pump frequency, the frequency measurement range can be adjusted from 0 to 40 GHz. The prototype is comprehensively studied and tested, which is capable of achieving a range resolution of 3.75 cm, a range error of less than ±2 cm, a radial velocity error within ±1 cm/s, delivering clear imaging of multiple small targets, and maintaining a frequency measurement error of less than ±7 MHz and a frequency resolution of better than 20 MHz. Copyright © 2024, The Authors. All rights reserved.

关键词： Fiber Bragg gratings

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RGB-D Instance Segmentation-based Suction Point Detection for Grasping

RGB-D Instance Segmentation-based Suction Point Detection fo...

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IEEE International Conference on Robotics and Biomimetics

作者： Yeyu Fu Ting Sun Li Wang Shijie Yu Lei Deng Baohua Chen Lin Li Yusen Xie Shuixin Deng Hanxi Yin Joint International Research Laboratory of Advanced Photonics and Elextronics Beijing Information Science & Technology University Beijing China Department of Perception zhong-guancun Open Lab. Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing China Department of Automation Tsinghua University Beijing China

ISBN: (纸本)9781665481106

Suction is a common way for robots to pick objects in industry, which has higher stability and reliability. However, it is necessary to evaluate the suction position on the object's surface when dealing with objects of different shapes. The previous method decouples it into a two-stage suction point detection and objects classification process, making the task more complex and time-consuming. On the other hand, there are significant challenges in acquiring training data. To address that, we propose an object instance segmentation-based suction grasping point detection method. Instance segmentation, as an object pixel-level perception method, can classify objects and find the orientation of objects in the plane, which is more efficient than simple classification. Specifically, our method generate a suction heatmap and object instance segmentation from RGB-D inputs and find the suction grasping position of each object after candidate points screening. To generate the training data, a heatmap mask based on 2D Gaussian-encoded is used to annotate the suction grasping ground truth. We evaluate each object's predicted suction grasping point results and conduct grasping experiments in real environments. The suction grasping success rate of 94% in dense scenes demonstrates the remarkable performance of the proposed method.

关键词： Heating systems Shape Service robots Design methodology Training data Grasping Stability analysis

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Emergent chiral toplogical point gaps in a non-Hermitian quasiperiodic Su-Schrieffer-Heeger model

arXiv

引用

arXiv 2025年

作者： Liang, Zhi-Bin Li, Shan-Zhong Li, Runze Li, Zhi Key Laboratory of Atomic and Subatomic Structure and Quantum Control Ministry of Education Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter School of Physics South China Normal University Guangzhou510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for Physics South China Normal University Guangzhou510006 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement MOE School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China

We study a quasiperiodic Su-Schrieffer-Heeger lattice with staggered on-site gain-loss. The results reveal that on-site staggered gain-loss can effectively induce non-Hermitian topological gap without introducing imaginary phase. Further analysis exhibits that five different processes of topological phase transitions, including topological re-entrant phenomena, with the gain-loss intensity increasing. In addition, through the analysis of inverse participation ratios, normalized participation ratios, winding number and other indicators, we find that topological phase transitions occur synchronically with localized phase transitions. Finally, by investigating the properties of dual space eigenfunction, we reveal that the non-Hermitian topological point gaps predicted in this paper are chiral point gaps, which have a pair of skin modes along opposite directions simultaneously. Copyright © 2025, The Authors. All rights reserved.

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Study on mechanical properties of thin-walled cavity structure with a large aspect ratio for ultra-precision optical instrument

引用

IOP Conference Series: Materials Science and engineering 2020年第1期892卷

作者： Lin Li Jun Zhong Jie Sui Yun-fang Zhang Wei-zhen Lv Xiao-yan Wang Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing 100190 China

The maximum size scale of a Thin-walled Cavity Structure (TSC) with A Large Aspect Ratio (TCSA) for ultra-precision optical instrument used in space station is more than 500. The TCSA should be strong enough, and at the same time, its mass should be lighter. Firstly, the characteristics of the thin-walled structure with ring-rib and longitudinal rib cavity were discussed, and the optimization design method of the rib structure was put forward based on the rib contribution theory. Secondly, the mathematical model was established, and the sensitivity analysis of the design variables and objective functions was carried out. On this basis, the iterative formula of the optimization of the rib structure was derived, and the optimization design of the TCSA was carried out. Finally, the system level simulation analysis and mechanical test were carried out for the optimized structure. The results show that the maximum relative changing rate of the first-order frequency before and after the test is 2.05%, the maximum relative error of the first-order frequency between the calculation mode and the test mode is 1.23%, and the fundamental frequency of the whole instrument is greater than 120Hz, which proves that the finite element model is more accurate. The displacement of random response of TCSA after optimization is 0.61mm, the maximum stress is 39.2mpa, far less than the allowable stress, which meets the mechanical requirements, and the adopted optimization method was proved to be useful. At the same time, the high precision optical instrument with good mechanical properties was also proved.

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SoccerNet 2023 Challenges Results

arXiv

引用

arXiv 2023年

作者： Cioppa, Anthony Giancola, Silvio Somers, Vladimir Magera, Floriane Zhou, Xin Mkhallati, Hassan Deliège, Adrien Held, Jan Hinojosa, Carlos Mansourian, Amir M. Miralles, Pierre Barnich, Olivier De Vleeschouwer, Christophe Alahi, Alexandre Ghanem, Bernard Van Droogenbroeck, Marc Kamal, Abdullah Maglo, Adrien Clapés, Albert Abdelaziz, Amr Xarles, Artur Orcesi, Astrid Scott, Atom Liu, Bin Lim, Byoungkwon Chen, Chen Deuser, Fabian Yan, Feng Yu, Fufu Shitrit, Gal Wang, Guanshuo Choi, Gyusik Kim, Hankyul Guo, Hao Fahrudin, Hasby Koguchi, Hidenari Ardö, Håkan Salah, Ibrahim Yerushalmy, Ido Muhammad, Iftikar Uchida, Ikuma Be'ery, Ishay Rabarisoa, Jaonary Lee, Jeongae Fu, Jiajun Yin, Jianqin Xu, Jinghang Nang, Jongho Denize, Julien Li, Junjie Zhang, Junpei Kim, Juntae Synowiec, Kamil Kobayashi, Kenji Zhang, Kexin Habel, Konrad Nakajima, Kota Jiao, Licheng Ma, Lin Wang, Lizhi Wang, Luping Li, Menglong Zhou, Mengying Nasr, Mohamed Abdelwahed, Mohamed Liashuha, Mykola Falaleev, Nikolay Oswald, Norbert Jia, Qiong Pham, Quoc-Cuong Song, Ran Hérault, Romain Peng, Rui Chen, Ruilong Liu, Ruixuan Baikulov, Ruslan Fukushima, Ryuto Escalera, Sergio Lee, Seungcheon Chen, Shimin Ding, Shouhong Someya, Taiga Moeslund, Thomas B. Li, Tianjiao Shen, Wei Zhang, Wei Li, Wei Dai, Wei Luo, Weixin Zhao, Wending Zhang, Wenjie Yang, Xinquan Ma, Yanbiao Joo, Yeeun Zeng, Yingsen Gan, Yiyang Zhu, Yongqiang Zhong, Yujie Ruan, Zheng Li, Zhiheng Huang, Zhijian Meng, Ziyu Belgium Saudi Arabia Sportradar Norway UCLouvain Belgium EPFL Switzerland EVS Broadcast Equipment Belgium Baidu Research United States Belgium Sharif University of Technology Iran Footovision France Zewail City of Science Technology and Innovation Egypt Université Paris-Saclay CEA France Universitat de Barcelona Spain Computer Vision Center Spain Nagoya University Japan Research Center for Applied Mathematics and Machine Intelligence Zhejiang Lab China AIBrain United States OPPO Research Institute China Germany Meituan China Tencent Youtu Lab China Amazon Prime Video Sport United States Sogang University Korea Republic of The University of Tokyo Japan Spiideo Sweden University of Tsukuba Japan School of Artificial Intelligence Beijing University of Posts and Telecommunications China Normandie Univ INSA Rouen LITIS France Shanghai Jiao Tong University China Key Laboratory of Intelligent Perception and Image Understanding The Ministry of Education Xidian University China NASK - National Research Institute Poland Robo Space China Tongji University China Sportlight Technology United Kingdom School of Control Science and Engineering Shandong University China lRomul Russia Aalborg University Denmark Turing AI Cultures GmbH Germany Information Systems Technology and Design Singapore University of Technology and Design Singapore Sun Yat-sen University China

The SoccerNet 2023 challenges were the third annual video understanding challenges organized by the SoccerNet team. For this third edition, the challenges were composed of seven vision-based tasks split into three main themes. The first theme, broadcast video understanding, is composed of three high-level tasks related to describing events occurring in the video broadcasts: (1) action spotting, focusing on retrieving all timestamps related to global actions in soccer, (2) ball action spotting, focusing on retrieving all timestamps related to the soccer ball change of state, and (3) dense video captioning, focusing on describing the broadcast with natural language and anchored timestamps. The second theme, field understanding, relates to the single task of (4) camera calibration, focusing on retrieving the intrinsic and extrinsic camera parameters from images. The third and last theme, player understanding, is composed of three low-level tasks related to extracting information about the players: (5) re-identification, focusing on retrieving the same players across multiple views, (6) multiple object tracking, focusing on tracking players and the ball through unedited video streams, and (7) jersey number recognition, focusing on recognizing the jersey number of players from tracklets. Compared to the previous editions of the SoccerNet challenges, tasks (2-3-7) are novel, including new annotations and data, task (4) was enhanced with more data and annotations, and task (6) now focuses on end-to-end approaches. More information on the tasks, challenges, and leader-boards are available on https://***. Baselines and development kits can be found on https://***/SoccerNet. © 2023, CC BY.

关键词： Computer vision

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Model Checking of Workflow Nets with Tables and Constraints

引用

ACM Transactions on Autonomous and Adaptive Systems 1000年

作者： Jian Song Guanjun Liu Miaomiao Wang Department of Computer Science Tongji University China Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering China

Many operations in workflow systems are dependent on database tables. The classical workflow nets and their extensions (e.g., worflow nets with data) cannot model these operations, so that they cannot find some related errors. Recently, workflow nets with tables (WFT-nets) were proposed to remedy such a flaw. However, existing methods for constructing the reachability graph of the WFT-nets can generate pseudo states because they do not take into account the guards that constrain the enabling and firing of transitions. Additionally, only the soundness property of WFT-nets is considered that represents a single design requirement, while many other requirements, especially those related to tables, cannot be *** this paper, we re-define the formalism of WFT-nets by augmenting the constraints of guards to them and re-name them as workflow nets with tables and constraints (WFTC-nets). We propose a new method to generate the state reachability graph (SRG) of WFTC-nets such that the SRG can avoid pseudo states by considering the guard constraints. To represent design requirements related to database operations, we define database-oriented computation tree logic (DCTL).We design the model checking algorithms of DCTL based on the SRG of WFTC-nets and develop a tool. Experiments on several public benchmarks show the usefulness of our methods.

关键词： WFTC-nets Guards Pseudo states Model checking

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