检索结果-内蒙古大学图书馆

Conference on Fundamental Problems of Optoelectronics and Microelectronics III

作者： Li, Baohua Zhang, Yingchun Li, Huayi Wang, Changhong Harbin Inst Technol Space Control & Inertia Technol Res Ctr Harbin 150001 Peoples R China Harbin Inst Technol Res Ctr Satellite Technol Harbin 150001 Peoples R China

ISBN: (纸本)9780819467270

The sufficient attitude knowledge including location of recognized stars in star image can be obtained with Lost-In-Space case. In order to make use of the sufficient attitude knowledge, the star sensor may work in star tracking case. To achieve this, a star tracking algorithm is proposed in this paper. The previous location of recognized stars in star image may be used to obtain location of observed star in proper region of current star image with the star tracking algorithm. The simulations and real sky experiment results show that the star tracking algorithm proposed in this paper not only improves update rate of star sensor, but also avoids fault star pattern recognition. Finally, a star sensor featuring star tracking algorithm proposed in this paper was for on-orbit demonstration.

关键词： star sensor star tracking algorithm location of star

来源：评论

学校读者我要写书评

暂无评论

Mapping the Kalman tracking algorithm onto the transputer network

引用

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 1998年第2期34卷 681-686页

作者： Vaidehi, V Krishnan, CN Anna Univ Madras Inst Technol Sch Instrumentat & Elect Chennai 600044 India

The Kalman tracking algorithm estimates position, velocity, and acceleration of a target from noisy measurement. A parallel Kalman algorithm is derived using the row-column partitioning with the modified state vector representation for multiprocessor realization. Mapping the tasks onto the multiprocessor system to minimize the time needed to complete all the tasks is an NP hard problem, and it arises when the task dependency structure of a parallel algorithm differs from the processor interconnection topology or when the number of processes generated by the algorithm exceeds the number of processors available. The efficient mapping of 3D-3S parallel Kalman tracking algorithm onto the network of 10 transputers, which are connected in tree structure that achieves a speedup of 6 is presented here.

关键词： star tracking algorithm Surjective tracking algorithms back tracking algorithm edge following algorithm Network

来源：评论

学校读者我要写书评

暂无评论

An Autonomous Predicted star Locations algorithm for star Sensor

An Autonomous Predicted Star Locations Algorithm for Star Se...

引用

2nd International Conference on Mechanical Design and Power Engineering (ICMDPE 2013)

作者： Zheng, Xunjiang Zhang, Guangjun Li, Baohua Beihang Univ Beijing 100191 Peoples R China Shanghai Aerosp Control & Engn Inst Shanghai 200233 Peoples R China Harbin Inst Technol Space Control & Inertial Technol Res Ctr Harbin 150001 Peoples R China

ISBN: (纸本)9783038350019

The larger area threshold scan window in star image is scanned with conventional star tracking algorithm under large maneuvering of the vehicle. This results that the number of calculating angular separation between two stars is increased. So the update rate of star sensor is decreased and the feasibility of errors star locations is increased. So, an autonomous predicted star locations algorithm with high angle velocity is presented in this paper. Firstly, the actual star locations are obtained within the threshold scan window of corresponding ideal star locations calculated by last frame in the current star image. Secondly the current attitude information is calculated with the obtaining actual star locations. Thirdly, the next ideal attitude is calculated with current attitude and last attitude. Finally, the next ideal star locations are calculated with the next ideal attitude. At last the algorithm are tested not only simulation but also at night sky experiment with the angular speed maneuvering of aircraft is 5.208681 degrees/s in 2013. And the algorithm has be applied star sensor of satellite GNC.

关键词： celestial navigation star sensor star tracking algorithm predictive star centroiding algorithm

来源：评论

学校读者我要写书评

暂无评论

An Autonomous Predictive Centroiding algorithm for star Sensor

An Autonomous Predictive Centroiding Algorithm for Star Sens...

引用

4th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2012)

作者： Li Bao-hua Li Jing Chen Xi-jun Harbin Inst Technol Space Control & Inertial Technol Res Ctr Harbin 150001 Peoples R China Jiujiang Univ Coll Sci Math Phys Jiujiang Peoples R China

ISBN: (纸本)9783037852842

Of all current methods for measuring spacecraft attitude, the use of star sensors produces the most accurate measurements. Conventional star sensors repeat these processes with Lost-In-Space case. To advance the methods available to solve these problems, this paper presents an autonomous predictive centroiding algorithm for the star sensor. The star sensor works in the star predictive centroiding case while few recognized stars within the FOV (Field of View). The ideal locations of unrecognized stars and recognized stars in star image are predicted at first. Then the corresponding real locations of recognized stars and unrecognized stars are obtained in the threshold scan window of predictive centroiding. It enables only several hundred pixels to be scanned. The speed and the accuracy of this algorithm are successfully demonstrated in comparison with the ordinary centroiding, algorithms which don't use the previous image data. Finally the autonomous predictive centroiding algorithm was successfully demonstrated with real sky experiment in 2008 and on-orbit in 2010.

关键词： star sensor predictive centroiding algorithm star tracking algorithm

来源：评论

学校读者我要写书评

暂无评论

Vision-Based tracking and Estimation of Ground Moving Target Using Unmanned Aerial Vehicle

Vision-Based Tracking and Estimation of Ground Moving Target...

引用

American Control Conference

作者： Mingfeng Zhang Hugh H.T. Liu Institute for Aerospace Studies University of Toronto Toronto Canada

ISBN: (纸本)9781424474264

The problem of autonomous tracking a ground moving target using one single unmanned aerial vehicle is studied. An integrated tracking algorithm is proposed and it consists of a vision-based estimator and a Lyapunov vector field-based guidance law. The tracking trajectory converges to a circular orbit loitering around the target of arbitrary motion. Further, the proposed estimator ensures continuous tracking mission in presence of the loss-of-tracking events. The performance of the proposed tracking algorithm is demonstrated through computer simulations.

关键词： vehicle Unmanned Aerial Vehicle drone honey bees tracking Moving ground back tracking algorithm edge following algorithm star tracking algorithm

来源：评论

学校读者我要写书评

暂无评论

Occlusion-Robust Pedestrian tracking in Crowded Scenes

Occlusion-Robust Pedestrian Tracking in Crowded Scenes

引用

International IEEE Conference on Intelligent Transportation Systems

作者： Jeroen S. van Gastel Matthijs H. Zwemer Rob G.J. Wijnhoven Peter H.N. de With Eindhoven University of Technology the Netherlands. ViNotion B.V. Eindhoven the Netherlands. Contact

ISBN: (纸本)9781467365970

This paper focuses on tracking in typical traffic monitoring scenarios with emphasis on handling occlusions caused by trees, lampposts and cables. We extend the existing tracking with Occlusion handling and Drift correction (TROD) algorithm with a novel occlusion detection algorithm, based on measuring the changes in the object motion pattern. The motion information is extracted via frame differencing and described a the HOG descriptor. Occlusions are handled by preventing the model update and predicting the object location based on prior observations. Our proposed system clearly outperforms state-of-the-art tracking algorithms for larger occlusions in the specific pedestrian surveillance scenario, that is, the percentage of successfully tracked objects grows with 10-15%. At the same time, for non-specific public datasets, the performance is similar to existing state-of-the-art tracking algorithms.

关键词： paper focuses object motion pattern HOG descriptor Object motion Occlusion tracking Pedestrians back tracking algorithm edge following algorithm star tracking algorithm cable Crowding Model updating

来源：评论

学校读者我要写书评

暂无评论

Measurement of V2X Prototypes Performance. Comparison with Simulation Results

Measurement of V2X Prototypes Performance. Comparison with S...

引用

European Conference on Antennas and Propagation

作者： Iulia Ivan Philippe Besnier Xavier Bunlon Philippe Boutier Renault FR TCR RUC T93 1 av. du Golf 78288 Guyancourt France IETR UEB France INSA IETR UMR CNRS 6164 F-35708 Rennes France

ISBN: (纸本)9781467321877

This paper presents experimental results obtained from a test-bed with IEEE 802.11p modern prototypes and an RF channel emulator, and compares them with simulation results. Measurement results confirm some of the simulation results, and highlight the importance of using channel tracking algorithms at the receiver to support very high mobility.

关键词： IEEE 802. 11p standard RF channel emulator V2X communications Simulation results PROTOTYPE measurement result RF channel Receivers star tracking algorithm back tracking algorithm edge following algorithm Emulators

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：