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检索条件"机构=Technology and Engineering Center for Space Utilization"

共 989 条记录，以下是91-100 订阅

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High-precision geometric correction of Tiangong-2 interferometric imaging radar altimeter

High-precision geometric correction of Tiangong-2 interferom...

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Tiangong-2 Remote Sensing Application Conference on technology, Method and Application

作者： Liu, Zhiwen Liu, Yunfei Wang, Bo Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9789811335006

The interferometric imaging radar altimeter (InIRA) of Tiangong-2 is a new type of altimeter, which combines with traditional altimeter height tracking measurement technology, SAR synthetic aperture technology and SAR interference measurement technology. According to its imaging characteristics, a geometric correction algorithm for InIRA is proposed, and some positioning error sources included the virtual ellipsoid model, elevation errors and atmosphere transmission delay are corrected. Firstly, a geometric correction model is established based on slant Range-Doppler equations. Secondly, we correct the original virtual ellipsoid model of the geometric correction model to a new one for quite well describing its actual geometric relationship. Thirdly, we achieve elevation values from corresponding elevation data of InIRA as an input parameter of the geometric correction model. Fourthly, an atmosphere transmission delay is calculated by a simplified static model associated with elevation parameters. Finally, the geometric correction model is verified to be valid through actual images of InIRA. The result shows that the positioning accuracy improved by 3 pixels. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Radar imaging

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A method for predictive maintenance of mechanical equipment based on Transferable CNN-LSTM

A method for predictive maintenance of mechanical equipment ...

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2022 Global Reliability and Prognostics and Health Management Conference, PHM-Yantai 2022

作者： Du, Junrong Gui, Xuanang Song, Lei Gao, Song Zhang, Chenchen Li, Xuzhi Chinese Academy of Sciences University Chinese Academy of Sciences Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Beijing China Chinese Academy of Sciences Technology and Engineering Center for Space Utilization Key Laboratory of Space Utilization Beijing China

ISBN: (数字)9781665496315

ISBN: (纸本)9781665496315

In industry, predictive maintenance of mechanical equipment is an important and pressing problem. As new algorithms and methods continue to evolve in different learning approaches, providing the most effective maintenance remains a challenge. Predictive maintenance is the use of a variety of detection methods to determine the state of equipment in order to pre-trigger maintenance access. In production environments, there is a strong need for the industry to detect faults early and accurately and perform the necessary advance maintenance for minimize maintenance costs. In this paper, a transferable CNN-LSTM model for cross domain remaining useful life that can effectively extract long time series features, meanwhile using different data window sizes for pattern extraction in order to gain the optimal pattern extraction length. Extensive experimental results on Engine degradation simulation dataset (CMAPSS) from NASA show that our proposed model can better extract the potential time-series data feature patterns and effectively achieve the purpose of cross domain predictive maintenance. © 2022 IEEE.

关键词： NASA

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Image geometric correction parallelization of the Multi-Azimuth UV imager based on GPU

Image geometric correction parallelization of the Multi-Azim...

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Tiangong-2 Remote Sensing Application Conference on technology, Method and Application

作者： Zhang, Wanfeng Liu, Zhiwen Li, Shengyang Shao, Yuyang Zhou, Zhuang Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9789811335006

The Multi-Azimuth UV Imager (MAVI) is designed and built by Chinese scientific institute independently. The MAVI is comprised of the ultraviolet ring imager and the ultraviolet forward imager. One track of image of ultraviolet ring imager contains hundreds of standard image frames arranged along the track direction and possesses relatively higher data volume. To produce the standard level-one product rapidly, the entire procedure of geometric correction was decomposed into parameter parsing, data reading into memory, model of geometric correction, and data exporting to hard disk. Among these four steps of ultraviolet ring imager image processing, the construction and calculating of geometric correction model is the most time consuming. There exist several for loops in steps of geometric positioning and vector calculating. Simultaneously, the majority of C code of geometric positioning and vector calculating should be rewritten to adapt the CUDA GPU in this practice. Experimental results show that parallelized geometric correction could reach a speedup of 3.2 through image partition along the column direction on GPU. A better speedup result of URI image processing would be achieved through parallelizing all for loops in every step. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Graphics processing unit

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Assist-Arm Configuration Analysis for Dual-Arm space Robots in Capture Task 7

Assist-Arm Configuration Analysis for Dual-Arm Space Robots ...

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7th International Conference on Intelligent Robotics and Control engineering, IRCE 2024

作者： Zhang, Long Chinese Academy of Sciences Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Beijing China

ISBN: (纸本)9798350352399

space robots will play an important role in orbital missions in the future, and multi-arm space robots have a wider range of applications due to their flexible structure. For a dual-arm space robot performing capture task in the mission-arm and assist-arm mode, this paper firstly from an innovative perspective regards the combination of the assist arm and the actual base as a virtual base with adjustable dynamic parameters, and based on this, establishes the system dynamics model. Thereafter, the maximum contact force and the base attitude disturbance are derived as the indicators which are proved that different configurations of the assist arm can affect. Finally, through the simulation experiments, it can be seen that different configurations of the assist arm will have an impact on the capture task of the mission arm, especially for the base attitude disturbance caused by contact. © 2024 IEEE.

关键词： Robotic arms

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Maneuverability Analysis of a Mini-Rover on Rough Terrain for Planetary Caves Exploration 3

Maneuverability Analysis of a Mini-Rover on Rough Terrain fo...

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3rd International Conference on Service Robotics, ICoSR 2024

作者： Gan, Tianyue Yuan, Zihao Han, Rujin Wang, Ke Zhao, Haifeng University of Chinese Academy of Sciences Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350367119

Extraterrestrial caves and lava tubes offer natural protection from meteorite impacts and extreme temperatures. These formations may preserve geological information and deep volcanic matter. Additionally, lava tubes on the Moon or Mars could help us understand these planets and support future human activities. Rovers, essential for exploring lava tubes, must be equipped with scientific instruments and obstacle-crossing capabilities to navigate rough terrain and unknown environments. Ensuring the safety of the rover and its scientific payload while traversing challenging terrain is crucial. This paper introduces two parameters to describe terrain roughness and generate structured terrain. Using these parameters, the dynamic response of the rover on various terrain morphologies and roughness levels is analyzed numerically. Additionally, experiments on rover travel on structured and unstructured terrain are conducted. In summary, this study outlines the relationship between rover dynamics and terrain roughness, offering insights for future rover design. © 2024 IEEE.

关键词： Caves

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A Brief Review of the space Docking Mechanism 2

A Brief Review of the Space Docking Mechanism

引用

2nd International Conference on Service Robotics, ICoSR 2023

作者： Wang, Song Wang, Shuquan Technology and Engineering Center for Space Utilization University of Chinese Academy of Sciences Beijing China Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350304688

With the continuous development of space technology and the increasing number of spacecraft, on-orbit services are becoming increasingly important. The rendezvous and docking technology is one of the most important technologies for on-orbit services, involving spacecraft assembly, spacecraft on-orbit capture, and so on, among which the design of space docking mechanisms is the key to the successful realization of spacecraft docking. Based on the needs of large spacecraft assembly and light and small spacecraft on-orbit services, focusing on engineering realization, some important space docking mechanisms that have been verified in orbit and some new design concepts have been summarized. According to the application scenarios and complexity, the space docking mechanisms are classified into two types, large and light, and the form and working principle of each type of mechanism are studied separately to summarize the technical characteristics and development trend. This overview is intended to provide initial insight and guidance on the design options for docking mechanisms required for different space missions in real engineering. © 2023 IEEE.

关键词： Orbits

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Interactive Haptic simulation of cell microinjection task 3

Interactive Haptic simulation of cell microinjection task

引用

3rd International Conference on Artificial Intelligence and Computer engineering, ICAICE 2022

作者： Li, Mingzhe Yu, Ge Zhao, Meiqi Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781510663473

The cell microinjection task in space requires the operator on the ground hold the handle of haptic device to control the remote dexterous manipulator in space Cabin to needle into the cell for gene injection or nucleus extraction. To prevent the failure of punctures, the reliable force feedback plays a key role to adjust the position and velocity of the needle of manipulator in the process. In this paper, a feasible haptic rendering approach is presented to carry out the cell microinjection teleoperation. The cell is modeled as a sphere-tree adjacently connected with deformed springs with its cytomembrane and inner nucleus physical properties. A configuration-based constrained optimization method is performed to calculate the feedback force. We also propose a locking method to maintain the force feedback stable when the needle passes through cell boundaries with different physical properties. Finally, three sets of experiments are designed to validate the efficiency and stability of our method in cell microinjection. © 2023 SPIE.

关键词： Needles

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Research on real-time anomaly detection method of space imager based on hierarchical clustering

Research on real-time anomaly detection method of space imag...

引用

2018 IASTED International Conference on Modelling, Simulation and Identification ,MSI 2018

作者： Liang, Haoran Song, Lei Ma, Zhongsong Duan, Jiangyong Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780889869943

Anomaly detection is one of the key technologies to ensure its safety and reliability of space imaging payload in orbit. Under the influences of complex operating environment, uplink instructions, equipment performance and so on, concept drifting phenomenon is obvious and it is difficult to define the boundary between normal and abnormal data, thus traditional anomaly detection method based on threshold value will be invalid. Besides, the lack of abnormal samples which makes the serious imbalance of positive and negative sample will increase the difficulty of anomaly detection. As a result, a kind of unsupervised learning method based on hierarchical clustering was proposed. The method includes offline training and online detecting parts. In offline training process, selecting multivariate training data to cover most working modes, and acquiring the clusters of training data to establish the normal model. Then in online detecting process, detecting real-time data based on the normal model above. Finally, we utilize the real data of some space imaging payload to verify the validity of the proposed method. The result shows that this method could detect the abnormal state effectively in real-time without physical model and abnormal sample and easy to implement. © 2018 Proceedings of the IASTED International Conference on Modelling, Simulation and Identification, MSI 2018. All rights reserved.

关键词： Unsupervised learning

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Design of Autonomous Navigation and Obstacle Avoidance System for Rovers Based on ROS

Design of Autonomous Navigation and Obstacle Avoidance Syste...

引用

2023 China Automation Congress, CAC 2023

作者： Yan, Zhiyi Wang, Zhi Fan, Yu Lin, Qian Yang, Hanzhe Zhang, Peng University of Chinese Academy of Sciences Technology and Engineering Center for Space Utilization Beijing China Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350303759

The Autonomous Navigation and Obstacle Avoidance System for Rovers is primarily implemented based on ROS (Robot Operating System). This simulation system enables the rover to autonomously perceive its environment, plan paths, and navigate to its destination while conducting extraterrestrial celestial exploration and survey missions. This system comprises four modules: localization, mapping, planning, and control. We have developed global path planning algorithms and obstacle avoidance planning algorithms suitable for extraterrestrial environments. This provides rovers conducting extraterrestrial celestial patrol detection missions with a novel navigation and obstacle avoidance simulation system equipped with autonomous capabilities. © 2023 IEEE.

关键词： Mapping

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Remaining useful lifetime prediction of semiconductor lasers using radiation-induced model and particle filtering method

Remaining useful lifetime prediction of semiconductor lasers...

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2019 International Conference on Communications, Information System, and Computer engineering, CISCE 2019

作者： Wu, Wenbo Yu, Dequan Fu, Hongyong Men, Liangzhi Wang, Yang Zhang, Lu Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781728136813

The main factor, which leads to semiconductor lasers degradation in space mission experiments, is the introduction of lattice defects in the detector material produced by radiation. Therefore, a new remaining useful life (RUL) prediction method considering radiation effect is presented. The prediction method is based on failure mechanisms and particle filters, which realizes the combination of a physical model and data-driven method. The particle filters can abundantly employ degradation data and avoid ignoring the failure mechanism. Accelerated degradation testing (ADT) is proposed for effectively assessing the proposed prediction method, in which the proton radiation is selected as the accelerated stress. The prediction results are compared with other methods to verify the accuracy and effectiveness of the proposed prediction method. © 2019 IEEE.

关键词： Semiconductor lasers

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