Results 31 to 40 of about 6,166,267 (187)

A Survey on Laser Space Network: Terminals, Links, and Architectures

IEEE Access, 2022
Due to the high directionality and short wavelength of laser transmission in space, satellite laser communication can achieve high speed, wide bandwidth, high precision, and high security with no electromagnetic spectrum constraints.
Rui Li, Baojun Lin, Yingchun Liu, Mingji Dong, Shuai Zhao   +4 more
doaj   +1 more source

On the Achievable Rates for the Return-Link of Multi-Beam Satellite Systems Using Successive Interference Cancellation [PDF]

, 2011
This paper investigates the theoretically reachable rates in the return-link of multi-user multi-beam satellite systems. The return-link can actually be analyzed by means of multiple-input multiple-output signal processing techniques. While MIMO inspired
Michael Joham, Matteo Berioli, Rossetto, Francesco, Francesco Rossetto, Boussemart, Vincent, Berioli, Matteo, Joham, Michael, Vincent Boussemart   +7 more
core   +1 more source

Evaluation of the Emissions State of a Satellite Laser Altimeter Based on Laser Footprint Imaging

, 2022
The GaoFen-7(GF-7) satellite is equipped with China’s first laser altimeter for Earth observation; it has the capability of full waveform recording, which can obtain global high-precision three-dimensional coordinates over a wide range.
Xinming Tang, Jiaqi Yao, Haoran Zhai, Zhen Wen, Shuqi Wu   +4 more
core   +1 more source

Influence of a pulsed laser regime on surface finish induced by thedirect metal deposition process on a Ti64 alloy [PDF]

, 2014
tThe direct metal deposition (DMD) laser technique is a free-form metal deposition process, which allowsgenerating a prototype or small series of near net-shape structures.
GORNY, Cyril, CARRON, Denis, LE MASSON, Philippe, GHARBI, Myriam, PEYRE, Patrice, FABBRO, Rémy, CARIN, Muriel, MORVILLE, Simon   +7 more
core   +1 more source

Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime [PDF]

, 2008
Publisher version : http://iopscience.iop.org/0022-3727/41/15/155502/Laser drilling in the percussion regime is commonly used in the aircraft industry to drill sub-millimetre holes in metallic targets.
SCHNEIDER, Matthieu, BERTHE, Laurent, FABBRO, Rémy, MULLER, Maryse   +3 more
core   +1 more source

A security performance detection method for satellite space laser communication network based on transformer

Frontiers in Physics
The satellite space laser communication network becomes the core support of the aerospace information interconnection system. However, the dynamic nature of its links and high-dimensional transmission of data poses diverse security threats to the network.
Qing Zhong, Yinghu Wan, Xiaolin Zhu, Juan Zhu, Dejiang Wan, Yang Yu, Yao Jiang   +6 more
doaj   +1 more source

Modulation Format Identification in a Satellite to Ground Optical Wireless Communication Systems Using a Convolution Neural Network

Applied Sciences, 2022
The satellite-to-ground communication system is a significant part of future space communication networks. The free-space optical (FSO) communication technique is a prospective solution for satellite-to-ground communication.
Yucong Gu, Zhiyong Wu, Xueliang Li, Ruotong Tian, Shuang Ma, Tao Jia   +5 more
doaj   +1 more source

Broadband Laser Doppler Frequency Shift Emulator for Satellite Laser Communication

IEEE Photonics Journal, 2019
A novel emulator of laser Doppler frequency shift (DFS) for satellite laser communication based on microwave photonics technology is proposed and experimentally demonstrated.
Jinye Li, Yuan Yao, Guozhang Wu, Jiaqing Hou, Wenqi Yu, Bo Liu, Jianguo Liu   +6 more
doaj   +1 more source

Design of Novel Laser Crosslink Systems Using Nanosatellites in Formation Flying: The VISION

Aerospace, 2022
With growth in data volume from space missions, interest in laser communications has increased, owing to their importance for high-speed data transfer in the commercial and defense fields, spaceborne remote sensing, and surveillance.
Geuk-Nam Kim, Sang-Young Park, Sehyun Seong, Jae-Young Choi, Sang-Kook Han, Young-Eon Kim, Suyong Choi, Joohee Lee, Sungmoon Lee, Han-Gyeol Ryu, Seonghui Kim   +10 more
doaj   +1 more source

Improving Information Dissemination in Sparse Vehicular Networks by Adding Satellite Communication [PDF]

, 2012
Information dissemination in pure Vehicular Ad Hoc NETworks (VANETs) such as ITS-G5 becomes problematic when the network is sparse. In situations where the number of vehicles that can act as a communication node is insufficiently low, e.g. in rural areas
Strang, Thomas, Kloiber, Bernhard, Heijenk, Geert, Geert Heijenk, Spijker, Hanno, Thomas Strang, Hanno Spijker, Bernhard Kloiber   +7 more
core   +2 more sources