Results 151 to 160 of about 1,582 (191)

Inter-satellite laser communication system

2008 International Conference on Computer and Communication Engineering, 2008
Laser communication links in space are attractive alternatives to present-day microwave links. This paper firstly makes an overview of an optical inter-satellite communication terminal. This terminal contains several modules such as transmit assembly, receive assembly, diplexers, mirrors assembly, acquisition and tracking sensor optics, etc.
K. Shantha Lakshmi, M.P. Senthil Kumar, K.V.N. Kavitha   +2 more
openaire   +1 more source

Optical System in Laser Inter-Satellites Communication

2008 International Conference on Computer Science and Information Technology, 2008
We know that Inter-satellites communication is a very important to us. However, real global coverage can only be achieved by satellite systems. Satellites communication is the most important mean of the communication network. The traditional satellites communication and inter-satellites links are built by microwave.
Zhou Li, Wen Chuanhua, Liu Baoming
openaire   +1 more source

Space-based laser systems for inter-satellite communications

SPIE Proceedings, 2012
Space-based optical communications using satellites in low earth orbit (LEO) and Geo synchronous orbits (GEO) hold great promise for the proposed Internet in the Sky network of the future. Building high speed communications network using optical links in space has proven to be an extremely complicated task and many such schemes were tried without ...
Alex A. Kazemi, Allen Panahi
openaire   +1 more source

Research on telescope array for inter-satellites laser communication

Proceedings of SPIE, 2006
Recent years have seen an explosive increase in the application of inter-satellites laser communication system. Considerations make phased arrays an attractive target for optical communication applications. This paper proposes a novel telescope array for inter-satellites laser communication and investigates phased telescope arrays to be employed in
Li Zhou, Chuanhua Wen
openaire   +1 more source

Demonstrations of ARTEMIS-OICETS Inter-Satellite Laser Communications

24th AIAA International Communications Satellite Systems Conference, 2006
Japan Aerospace Exploration Agency (JAXA) developed the Optical Inter-orbit Communication Engineering Test Satellite (OICETS) for the purpose of establishment of the base technology of a next-generation space communication network. On 23rd August 2005, OICETS was successfully launched and thrown into a polar sun synchronous orbit at the altitude of 610
Takashi Jono, Yoshihisa Takayama, Koichi Ohinata, Nobuhiro Kura, Yoshisada Koyama, Katsuyoshi Arai, Kocihi Shiratama, Zoran Sodnik, Aneurin Bird, Benoit Demelenne   +9 more
openaire   +1 more source

Quick topological method for acquiring the beacon in inter-satellite laser communications

Applied Optics, 2014
Background starlight can lead to some spot noise in the image collected by a CCD, disturbing the beacon acquisition in inter-satellite laser communications. Removing the spot noise takes much time by using the existing method that is based on the reference star calendar table. We present a novel method to reduce the processing time in this paper.
Qiang, Wang, Jing, Ma, Liying, Tan, Siyuan, Yu   +3 more
openaire   +2 more sources

Inter-satellite communications using laser based optical links

SPIE Proceedings, 2007
Laser Communications offer a viable alternative to established RF communications for inter-satellite links and other applications where high performance links are a necessity. High data rate, small antenna size, narrow beam divergence, and a narrow field of view are characteristics of laser communications that offer a number of potential advantages ...
Allen S. Panahi, Alex A. Kazemi
openaire   +1 more source

Research on performance evaluation of Inter-Satellites laser communication system

2011 Second International Conference on Mechanic Automation and Control Engineering, 2011
Considering that noises with different kinds of distribution, the Gaussian Approximation method is firstly used to evaluate the Inter-Satellites Laser Communications performance precisely. The Moment Generating Function expression of considering shot noise, background optical noise and hot noise is firstly derived.
null Chuanhua Wen, null Tang Lei, null Hu Hongyun, null Yang Xiaoyuan   +3 more
openaire   +1 more source

Optical System in Laser Inter-Satellites Communication

Advanced Materials Research, 2014
We know that Inter-satellites communica-tion is a very important to us.However, real global coverage can only be achieved by satellite systems. Satellites communication is the most important mean of the communication network. The traditional satellites communication and inter-satellites links are built by microwave.
openaire   +1 more source

Research on denoising in WDM laser inter-satellites communication system

SPIE Proceedings, 2006
This paper proposes a method of wavelet analysis for de-noising at receiver system in WDM laser inter-satellites communication. Background noises such as galactic noise, sunlight and etc make the received power reduce. The noisy signal is decomposed using wavelets and wavelet packets; then is transformed into wavelet coefficients and the lower order ...
Chuanhua Wen, Yang Su, Yuquan Li, Li Zhou   +3 more
openaire   +1 more source