Results 11 to 20 of about 8,556,450 (194)

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope. [PDF]

Sensors (Basel), 2018
An engineering validation of a large optical telescope consists of executing major performing tests at the subsystem level to verify the overall engineering performance of the observatory.
Mutilba U, Kortaberria G, Egaña F, Yagüe-Fabra JA.   +3 more
europepmc   +2 more sources

On the ASER performance of amplify-and-forward relaying MIMO/FSO systems using SC-QAM signals over log-normal and gamma-gamma atmospheric turbulence channels and pointing error impairments

Journal of Information and Telecommunication, 2020
In this work, we analyse pointing error effects on the performance of amplify-and-forward (AF) relaying multiple-input multiple-output (MIMO) free-space optical (FSO) communication system employing sub-carrier quadrature amplitude modulation (SC-QAM ...
Duong Huu Ai, Ha Duyen Trung, Do Trong Tuan   +2 more
doaj   +2 more sources

A Correction Method of Estimating the Pointing Error for Reflector Antenna

Shock and Vibration, 2018
The pointing error caused by the structural deformation of large reflector antennas has become the most challenging problem of antenna servo control. Especially with the increase of the antenna diameter and the working frequency, environmental loads not ...
Jie Zhang, Jin Huang, Wei Liang, Youran Zhang, Qian Xu, Letian Yi, Congsi Wang   +6 more
doaj   +2 more sources

A deep learning approach for predicting the antenna pointing error caused by transmission faults with simulation data [PDF]

Scientific Reports
Reflector antenna has been widely used in deep space exploration, radar warning, and other fields, all of which requires high pointing accuracy. The antenna elevation bearings are the key component that guarantees its pointing accuracy, while any ...
Lihui Chen, Song Xue, Peiyuan Lian, Qian Xu, Meng Wang, Congsi Wang   +5 more
doaj   +2 more sources

Unified statistical performance of FSO link due to the combined effect of weak turbulence and generalized pointing error with HD and IM/DD

Journal of Communications and Networks, 2020
In this paper, we set up the statistical channel model of ship-to-ship (or ship-to-shore) free space optical links considering generalized pointing error and weak turbulence.
Kug-Jin Jung, Sung Sik Nam, Jinwoo Shin   +2 more
exaly   +2 more sources

High-Precision Calibration Technology and Experimental Verification for Dual-Axis Laser Communication Systems [PDF]

Sensors
With the continuous improvement of remote sensing satellite resolution, laser communication technology has gained significant traction. The pointing accuracy of ground-based laser communication terminals is critical for the stability of satellite–ground ...
Wenyan Li, Xiaolei Zhang, Lei Zhang, Xiang Wei, Guoxi Luo, Peng Zhang, Zhipeng Xue   +6 more
doaj   +2 more sources

Pointing Error Modeling of mmWave to THz High-Directional Antenna Arrays [PDF]

IEEE Wireless Communications Letters, 2022
This letter focuses on providing an analytical framework for the quantification and evaluation of the pointing error at high-frequency millimeter wave (mmWave) and terahertz (THz) communication links.
M. Dabiri, M. Hasna
semanticscholar   +1 more source

Modeling and Correction of Pointing Errors in Gimbals-Type Optical Communication Terminals on Motion Platforms

IEEE Photonics Journal, 2021
In free-space optical (FSO) communication, high-precision pointing is a critical technology required for rapid acquisition to reduce link establishment time and increase communication time.
Chao Peng, Dong He, Yuankang Wang, Yongmei Huang, Xiang Liu, Liangzhu Yuan, Yangjie Xu, Jiaming Lei, Haotong Ma   +8 more
doaj   +1 more source

Seeing your error alters my pointing: observing systematic pointing errors induces sensori-motor after-effects. [PDF]

PLoS ONE, 2011
During the procedure of prism adaptation, subjects execute pointing movements to visual targets under a lateral optical displacement: as consequence of the discrepancy between visual and proprioceptive inputs, their visuo-motor activity is characterized ...
Roberta Ronchi, Patrice Revol, Masahiro Katayama, Yves Rossetti, Alessandro Farnè   +4 more
doaj   +1 more source

Average symbol error probability and channel capacity of the underwater wireless optical communication systems over oceanic turbulence with pointing error impairments.

Optics Express, 2022
The influence of oceanic turbulence and pointing error impairments on the underwater wireless optical communication (UWOC) systems is considered in this study. We propose a generalized fading model, which comprises the path loss due to the absorption and
Zhiru Lin, Guanjun Xu, Qinyu Zhang, Zhaohui Song   +3 more
semanticscholar   +1 more source