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Optical Satellite Communication seminar report


Posted by: electronics seminars
Created at: Tuesday 05th of January 2010 03:39:00 AM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:27:03 AM
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racy to which one satellite knows the location of the other
2. accuracy to which it knows its own attitude and
3. accuracy to which it can aim its beam knowing the required direction.

3.3.2 Acquisition
The transmitted beam cannot be pointed at the communicating pointer in the open loop made with sufficient accuracy because of uncertainties in the attitude of the space craft, pointing uncertainties in the terminal and inadequate knowledge of the location of the other satellite. Consequently before communication can commence, a high power beam laser located on GEO end has to scan over th..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: audithya
Created at: Friday 23rd of October 2009 12:19:03 AM
Last Edited Or Replied at :Friday 23rd of October 2009 10:01:33 AM
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seminars on abov..................[:=> Show Contents <=:]



optical space communication or Free-space optical communicationFSO


Posted by: computer science crazy
Created at: Sunday 13th of September 2009 07:43:26 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:53 AM
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ireless units, each consisting of an optical transceiver with a transmitter and a receiver to provide full-duplex (bi-directional) capability. Each optical wireless unit uses an optical source, plus a lens or telescope that transmits light through the atmosphere to another lens receiving the information. At this point, the receiving lens or telescope connects to a high-sensitivity receiver via
optical fiber.

This FSO technology approach has a number of advantages:
Requires no RF spectrum licensing.
Is easily upgradeable, and its open interfaces support equipment from a variety of vend..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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wired lines between computer networks with fibre-like delay-free high bandwidth. It turned out as well that optical free space communication can be used to interconnect LAN's in campus or industrial environments in a reasonable way or to deploy temporary internet connection while the fibre installation can be done. Another application is to use laser links to bypass a broken data connection.

Military applications
There are not many information about military applications available. However there have been successful experiments to track moving objects with a laser beam as well for communi..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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ce on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering elements in the air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway..................[:=> Show Contents <=:]



FIBRE OPTIC COMMUNICATION


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:27:41 PM
Last Edited Or Replied at :Saturday 16th of July 2011 05:51:40 AM
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th the explosion of the internet, fiber optics can readily provide the capacity of data that is transmitted with its gigabit speeds. As more breakthroughs in technology occur, it will spread to every aspect of the industry. Telephones, Fax Machines, Radios, Television Broadcasting, and even satellites use this highly reliable light wave technology. The telecommunications industry receives the most benefits from fiber optics. It allows for the transmission of audio, video, and data information in high quality.

Fiber optics uses light pulses directed down a tiny glass fiber in order to relay ..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:49:27 AM
Last Edited Or Replied at :Tuesday 02nd of November 2010 07:23:59 AM
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ly accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz. It is estimated that many countries outside of Europe will join the GSM partnership.Throughout the evolution of cellular telecommunications, various systems have been developed without the benefit of standardized specifications. This presented many problems directly related to compatibility, especially with the develop..................[:=> Show Contents <=:]



Cellular Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:38:42 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:38:42 AM
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1980's, working initially in GSM and more recently in the definition and development of 3G (UMTS). Roke Manor Research has over 200 engineers with experience in designing hardware and software for 3G terminals and base stations and is currently developing technology for 4G and beyond.

We are uniquely positioned to provide 2G, 3G and 4G expertise to our customers.
The role of Roke Manor Research engineers in standardisation bodies (e.g. ETSI and 3GPP) provides us with intimate knowledge of all the 2G and 3G standards (GSM, GPRS, EDGE, UMTS FDD (WCDMA) and TD-SCDMA standards). Our engineers..................[:=> Show Contents <=:]



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