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CHES: A space-borne Astrometric Mission for the Detection of Habitable Planets of the Nearby Solar-type Stars

Research in Astronomy and Astrophysics 2022年第7期22卷 32-59页

作者： Jiang-Hui Ji Hai-Tao Li Jun-Bo Zhang Liang Fang Dong Li Su Wang Yang Cao Lei Deng Bao-Quan Li Hao Xian Xiao-Dong Gao Ang Zhang Fei Li Jia-Cheng Liu Zhao-Xiang Qi Sheng Jin Ya-Ning Liu Guo Chen Ming-Tao Li Yao Dong Zi Zhu CAS Key Laboratory of Planetary Sciences Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Key Laboratory of Electronics and Information Technology for Space Systems National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement Chinese Academy of SciencesChengdu 610209China Innovation Academy for Microsatellites of Chinese Academy of Sciences Shanghai 201306China School of Astronomy and Space Science Nanjing UniversityNanjing 210046China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

The Closeby Habitable Exoplanet Survey(CHES) mission is proposed to discover habitable-zone Earth-like planets of nearby solar-type stars(~10 pc away from our solar system) via microarcsecond relative *** major scientific objectives of CHES are:to search for Earth Twins or terrestrial planets in habitable zones orbiting100 FGK nearby stars;further to conduct a comprehensive survey and extensively characterize nearby planetary *** primary payload is a high-quality,low-distortion,high-stability *** optical subsystem is a coaxial three-mirror anastigmat(TMA) with a 1.2 m-aperture,0°.44 × 0°.44 field of view and 500 nm-900 nm working wave *** camera focal plane is composed of a mosaic of 81 scientific CMOS detectors each with4 k × 4 k *** heterodyne laser interferometric calibration technology is employed to ensure microarcsecond level(1 μas) relative astrometry precision to meet the requirements for detection of Earth-like *** CHES satellite operates at the Sun-Earth L2 point and observes all the target stars for 5 *** will offer the first direct measurements of true masses and inclinations of Earth Twins and super-Earths orbiting our neighbor stars based on microarcsecond astrometry from *** will definitely enhance our understanding of the formation of diverse nearby planetary systems and the emergence of other worlds for solar-type stars,and finally provide insights to the evolution of our own solar system.

关键词： Astrometry and Celestial Mechanics planets and satellites:detection planets and satellites:terrestrial planets stars:solar-type

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Design of large ring-column antenna satellite attitude-orbit integrated füll propulsion system

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Zhendong yu Chongji/Journal of Vibration and Shock 2025年第11期44卷 1-11页

作者： Wang, Shijie Sun, Minzhe Gao, Feng Ji, Yi Sun, Guanghui Dong, Fuxiang School of Astronautics Harbin Institute of Technology Harbin150001 China Frontier Science Center of Space Environment and Interaction of Matters Harbin150001 China State Key Lab for Modeling and Simulation of Complex Systems Harbin150001 China General Department of Communication and Navigation Satellite China Academy of Space Technology Beijing100094 China

As a key space structure in geostationary orbit, 100-meter level large ring-column antenna satellite is tasked with providing high-speed information transmission and stable communication Service in this orbit. This requires satellites having precise orbit maintenance and attitude control capabilities. Due to such satellites typically having larger masses and special structural designs, here, the high-precision orbit prediction algorithm was used to finely model and analyze effects of key space environmental factors of solar pressure, non-spherical perturbations and 3-body gravity on space Operation of such spacecrafts. Furthermore, referring to the design concept of formation-flying gravity field measurement satellites, a distributed füll thrust control strategy based on thruster layout optimization for such spacecrafts was proposed. Then, an improved explicit model predictive control algorithm was proposed based on Laguerre function to convert device capability limitations and Performance requirements into input-output constraints, combine multi-parameter programming, and realize attitude-orbit integrated control of such satellites. The simulation results showed that during stable Operation, position maintenance errors of such satellites can be controlled within a meter-level ränge, and attitude angle errors are better than 0. 03°;the computational efficiency of the proposed control algorithm is significantly higher than that of the Standard model predictive control algorithm and Laguerre function-based model predictive control algorithm;the hardware memory occupied is much lower than that of the explicit model predictive control *** theoretical analysis and numerical verification, it was shown that this study can provide an effective solving scheme for füll thruster integrated control of large ring-column antenna satellites in oomplex space environment using onboard Computers with limited Computing power. © 2025 Chinese Vibration Engineering Society.

关键词： Geostationary satellites

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WebGL-based Network Multi-view Visualization Interactive Analysis Method 4

WebGL-based Network Multi-view Visualization Interactive Ana...

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4th International Conference on Computer Information science and Artificial Intelligence, CISAI 2021

作者： Yu, Ronghuan An, Shenhao Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China

ISBN: (纸本)9781665406925

The space-ground integrated network is one of the important information infrastructures of the country in the future. In order to display its network structure in all directions and from multiple angles, a multi-view visualization interactive analysis method is proposed. First introduces the relevant basic technology, and then constructs the network dynamic model, which is mainly divided into three parts: link visibility analysis, relative motion analysis and visualization model construction. Finally, the digital earth technology is based on a unified coordinate system and data source. Establish a multi-dimensional view on it and provide a variety of interactive operations. Experimental results show that this method can more comprehensively show the structure of the space-ground integrated network, and help users understand its evolutionary law. © 2021 IEEE.

关键词： Complex networks

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A Multi-Agent Routing Algorithm with Trajectory Prediction for Highly Dynamic UAV Networks 22

A Multi-Agent Routing Algorithm with Trajectory Prediction f...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Zhao, Ziyi Zhang, Qi Li, Yuanfeng Xin, Xiangjun Ma, Jianxin Sun, Meng Zhao, Yi Chai, Furong Tian, Feng Wang, Fu Tian, Qinghua Wang, Yongjun Beijing100876 China BUPT Beijing Key Laboratory of Space-ground Interconnection and Convergence Beijing100876 China National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha410073 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Control and Electronic Technology Beijing100038 China

To address the routing problems in high-dynamic UAV networks, a multi-agent routing algorithm with trajectory prediction is proposed. simulations show the proposed algorithm can achieve better performance on the end-t... 详细信息

ISBN: (纸本)9798350367652

关键词： Unmanned aerial vehicles (UAV)

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Discrete Particle simulation of Gas-Solid Flow in Air-Blowing Seed Metering Device

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Computer Modeling in Engineering & sciences 2021年第6期127卷 1119-1132页

作者： Zhengquan Li Pei Zhang Yongchang Sun Chenglin Zheng Liang Xu Dianyu E Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science&TechnologyGanzhou341000China Energy Materials Computing Center Jiangxi University of Science&TechnologyNanchang330013China

In this paper,the gas and seed flow characters in the air-blowing seed metering device are investigated by using the coupled computational fluid dynamics and discrete element method(CFD-DEM)in three dimensions(3D).The method of establishing boundary model based on the computer-aided design(CAD)drawing,has been used to build the boundary model of seed metering *** 3D laser scanning technique and multi-element method are adopted to establish the particle *** a combined numerical and experimental effort,using 3D CFD-DEM software,which is based on the in-house codes,the mechanisms governing the gas and solid dynamic behaviors in the seed metering device have been *** gas velocity field and the effect of different rotational speeds and air pressures on the seeding performance and particle velocity have been studied,similar agreements between numerical and experimental results are *** reveals that the 3D CFD-DEM model established is able to predict the performance of the air-blowing seed metering *** can be used to design and optimize the air-blowing seed metering device and other similar agriculture devices.

关键词： Seed metering device CFD-DEM CAD simulation gas-solid flow

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Research on Integration Framework and Service Adaptation technology of space System simulation Test-bed

Research on Integration Framework and Service Adaptation Tec...

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2021 International Conference on Advanced Materials and Mechatronics, ICAMM 2021

作者： Liu, Desheng Chang, Qing Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

Aiming at the requirements of space system simulation test-bed in heterogeneous integration and co-simulation, the support capability of test-bed integration framework is analysed. A space system simulation test-bed integration framework based on bridging adaptation service is constructed, and adaptation services such as protocol adaptation, information publication, information subscription and service control for service oriented architecture are designed and implemented, which provide integration capability and co-simulation management capability for heterogeneous systems, models and components of space system simulation test-bed. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.

关键词： Information services

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Analysis on the Complex Characteristics of the space-ground Integrated Network Structure 2

Analysis on the Complex Characteristics of the Space-ground ...

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2nd International Seminar on Artificial Intelligence, Networking and Information technology, AINIT 2021

作者： An, Shenhao Yu, Ronghuan Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

ISBN: (纸本)9781665412964

The space-ground integrated network is one of the important information infrastructures of the country in the future. In order to further promote its visualization research, the structural characteristics of the space-ground integrated network are analyzed from the perspective of network complexity. Firstly, it introduces the development status of the space-ground integrated network, and then describes its overall structure and composition, focusing on the analysis of the complex characteristics of the space-ground integrated network structure from four aspects: heterogeneity, multi-layeredness, dynamics and distribution. Finally, Prospects for the next research direction. © 2021 IEEE.

关键词： Complex networks

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A beam propagation simulation method based on power spectral density method and Zernike tilt

A beam propagation simulation method based on power spectral...

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2024 Conference on Spectral technology and Applications, CSTA 2024

作者： Cao, Zhongyu Yao, Haifeng Zhang, Yixiang Wang, Weihao Cao, Jie Dong, Keyan Hao, Qun School of Optoelectronic Engineering Changchun University of Science and Technology Changchun130022 China Institute of Space Optoelectronics Technology Changchun University of Science and Technology Changchun130022 China Key Laboratory of Biomimetic Robots and Systems Ministry of Education School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019 China

ISBN: (纸本)9781510683082

In applications such as astronomical observation, long-range reconnaissance, and laser communication, the atmospheric turbulence severely affects the quality of beam transmission, resulting in distortion and blurring of the received beam. To correct for these distortions and blurring, algorithms can simulate and generate a large number of atmospheric turbulence spot datasets, thereby providing a basis for atmospheric turbulence correction *** paper utilizes the power spectrum inversion method to generate the phase screen of atmospheric turbulence. The point spread function is generated through inverse Fourier transformation, and then convolved with a Gaussian beam to make the Gaussian spot blurred. Subsequently, based on the spatial correlation of the Zernike method generates horizontal and vertical tilt amounts and overlaid onto the blurred beam, representing the received beam after propagation through atmospheric turbulence. Set the simulation of beam propagation through atmospheric turbulence under three different atmospheric refractive index constants. Finally, the scintillation index and Rytov variance are calculated by simulating turbulence light spot. Experimental results show that the simulated light spot exhibits distortion and blurring effects. The scintillation index and Rytov variance of 20 sets of experimental turbulent light spot are calculated, and compared with the analytical theoretical curve, achieving a fitting efficiency of over 90%, thus demonstrating the effectiveness of this method in simulating beam propagation under atmospheric turbulence conditions. © 2024 SPIE.

关键词： Gaussian beams

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A DQN-based hyperheuristic algorithm for emergency scheduling of Earth observation satellites 2

A DQN-based hyperheuristic algorithm for emergency schedulin...

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2nd International Conference on Electronics, Communications and Information technology, CECIT 2021

作者： Liu, Zheng Xiong, Wei Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China

ISBN: (纸本)9781665437578

With the surge of emergency task demand, large-scale Earth observation satellite emergency scheduling has become a practical problem which is urgent to be solved. In view of this situation, this paper analyzes the constrains and conflict relationship in this problem, and proposes a DQN-based hyperheuristic algorithm. The algorithm includes encoding and decoding, deep Q-network and several low-level heuristic operators. A Markov decision model of this problem is established and 7 low-level heuristic operators are designed according the feature of this problem. After training, DQN behaves well when selecting operators for the scheduling scheme. Finally, several groups of comparative experiments verify the algorithm's ability in solving large-scale satellite emergency scheduling problems. © 2021 IEEE.

关键词： Personnel training

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Collaborative Filtering Recommendation Algorithm of Weaponry Based on Knowledge Graph 2

Collaborative Filtering Recommendation Algorithm of Weaponry...

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2nd IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2021

作者： Li, Xiao Liu, Desheng Chang, Qing Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China

ISBN: (纸本)9781665428767

Nowadays, modern warfare has changed from weapon-centric operations to network-centric system operations, which has led to the phenomenon of sea-level quantification of weaponry. It is an important research topic for combat commanders to select suitable weaponry from a large number of available resources when facing combat tasks. Recommendation technology is a solution to this problem, which can effectively solve the problem of information overload, so that combat commanders do not produce the phenomenon of 'information loss', in the shortest possible time to make the right decision. Therefore, this paper proposes a collaborative filtering recommendation algorithm for weaponry based on the knowledge graph and the idea of collaborative filtering. In this algorithm, the knowledge graph provides a clear data model with various association relationships, and the collaborative filtering algorithm can realize it without relying on professional experience, which can realize the recommendation process more actively, faster and more intelligently. © 2021 IEEE.

关键词： Collaborative filtering

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