Results 31 to 40 of about 8,556,450 (194)

A Generalized Pointing Error Model for FSO Links With Fixed-Wing UAVs for 6G: Analysis and Trajectory Optimization [PDF]

IEEE Transactions on Wireless Communications
Free-space optical (FSO) communication is a promising solution to support wireless backhaul links in emerging 6G non-terrestrial networks. At the link level, pointing errors in FSO links can significantly impact capacity, making accurate modeling of ...
Hyung-Joo Moon, Chan-Byoung Chae, Kai-Kit Wong, M. Alouini   +3 more
semanticscholar   +1 more source

Error modeling and analysis of optomechanical platform based on multi-system theory

AIP Advances, 2020
The quality of camera imaging is of great significance in aerial photography and space target detection, especially in the fields of military reconnaissance and geographic resource telemetry.
Dongxue Wang, Zhanguo Li, Jieqiong Lin, Mingming Lu, Yingchun Li   +4 more
doaj   +1 more source

A Simplified Pointing Model for Alt-Az Telescopes

Applied Sciences, 2023
The telescope pointing model plays a crucial role in characterizing and explaining the inaccuracies in the telescope’s pointing. It uses mathematical models to express these errors and suggests methods to calibrate and rectify them.
Yong Zhao, Yingqiang Wang, Fei He, Zhonghua Yao, Zhaojin Rong, Yong Wei   +5 more
doaj   +1 more source

Proposal of Hybrid NOAM-MPPM Technique for Gamma-Gamma Turbulence Channel with Pointing Error and Different Deep Learning Techniques

IEEE Access, 2021
A hybrid multistates orbital angular momentum-multi pulse-position modulation (NOAM-MPPM) scheme over gamma-gamma free-space optical (ΓΓ-FSO) channel is studied in this paper.
Shimaa A. El-Meadawy, H. Shalaby, N. A. Ismail, F. El-Samie, N. Soliman, A. Algarni, Walid El Shafai, Ahmed E. A. Farghal   +7 more
semanticscholar   +1 more source

A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy

International Journal of Antennas and Propagation, 2020
The purpose of this paper is to investigate a large radio telescope support point number effect on its pointing accuracy and provide a useful guideline for the large radio telescope design engineer. In a large radio telescope system, the azimuth track is
Song Xue, Kaitong Ma, Congsi Wang, Peiyuan Lian, Yan Wang, Yuefei Yan, Qian Xu, Yuanpeng Zheng, Na Wang   +8 more
doaj   +1 more source

A Reverse-Design Strategy for the Track Error of the Qi Tai Telescope Based on Pointing Accuracy

Engineering, 2022
The Qi Tai Telescope (QTT), which has a 110 m aperture, is planned to be the largest scale steerable telescope in the world. Ideally, the telescope’s repeated pointing accuracy error should be less than 2.5 arc seconds (arcsec); thus, the telescope ...
Na Li, Baoyan Duan, Xiangyang Li, Bin Zheng, Jiang Wu   +4 more
doaj   +1 more source

Impact of Correlation and Pointing Error on Secure Outage Performance Over Arbitrary Correlated Nakagami-$m$ and $\mathcal {M}$-Turbulent Fading Mixed RF-FSO Channel

IEEE Photonics Journal, 2021
In Radio Frequency (RF)-Free Space Optical (FSO) mixed links, secrecy capacity (SC) can be improved by exploiting spatial diversity (i.e., antenna diversity) in the RF path.
S. H. Islam, A. S. M. Badrudduza, S. Islam, Fardin Ibne Shahid, I. S. Ansari, M. K. Kundu, Heejung Yu   +6 more
semanticscholar   +1 more source

Analysis of Coaxiality Error Induced by the Cube Corner Retro-Reflector Geometrical and Assembly Errors of an Acquisition, Pointing, and Tracking System

Photonics, 2023
Satellite laser communication is a promising technology for the next-generation communication system. Its communication performance is subject to the APT beam-pointing accuracy.
Daquan Li, Zhaoyong Mao, Lijuan Sun, Haifeng Zhang, Furui Zhang   +4 more
doaj   +1 more source

Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network [PDF]

International Journal of Electronics and Telecommunications, 2022
This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME).
Deepti Agarwal, Poonam Yadav
doaj   +1 more source

Intelligent Motion Compensation for Improving the Tracking Performance of Shipborne Phased Array Radar

International Journal of Antennas and Propagation, 2013
The shipborne phased array radar must be able to compensate the ship’s motion and track the maneuvering targets automatically. In this paper, the real-time beam pointing error compensation mechanism of a planar array antenna for ship’s motion is ...
J. Mar, K. C. Tsai, Y. T. Wang, M. B. Basnet   +3 more
doaj   +1 more source