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Trends in satellite communications and the role of optical free-space communications

Posted by: seminar class
Created at: Wednesday 04th of May 2011 04:07:50 AM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:26:09 AM
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onder bandwidth of about 1 GHz even in GEO, the
communication capacity does not drop . Figures 3 and 4 show the trends in data storage capacity and
the number of bits per pixel of stored image data. For 2010, one can easily make the following
predictions: The data rate of some satellites will increase to several gigabits per second; the angular
resolution of some satellites will be approximately 0.1 ╬╝rad, corresponding to a resolution of several ten
centimeters on Earth; the data storage capacity of onboard data recorders will be several terabytes; and
the number of bits per pixel wi..................[:=> Show Contents <=:]

Optical Computing Technology Download Full Report And Abstract

Posted by: computer science crazy
Created at: Saturday 21st of February 2009 01:58:37 PM
Last Edited Or Replied at :Tuesday 14th of February 2012 05:18:01 AM
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ation of a VCSEL is very similar to those of regular lasers.

There are two special semiconductor materials sandwiching an active layer where all the action takes place. But rather than reflective ends, in a VCSEL there are several layers of partially reflective mirrors above and below the active layer. Layers of semiconductors with differing compositions create these mirrors, and each mirror reflects a narrow range of wavelengths back in to the cavity in order to cause light emission at just one wavelength.
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Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 12:17:41 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:26:54 AM
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For airborne platforms, the advantages of SHF satcoms come at the expense of a significant additional burden in terms of antenna siting and pointing, particularly for smaller, highly agile aircrafts. Antenna should be large enough to support the desired data rate and to provide enough directivity to minimise interference with adjascent satellites and avoid detection by hostile forces. Another feature of satcoms, unique to aircraft, is the effect of unwanted modulation from moving parts such as helicopter rotor blades, propellers and jet engines.

This paper gives an overview of develop..................[:=> Show Contents <=:]


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 04:27:27 AM
Last Edited Or Replied at :Thursday 24th of March 2011 06:18:43 AM
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ively recent development in the world of television distribution. ?Direct broadcast satellite? can either refer to the communications satellites themselves that deliver DBS service or the actual television service. DBS systems are commonly referred to as mini-dish systems. DBS uses the upper portion of the Ku band. Modified DBS systems can also run on C-band satellites and have been used by some networks in the past to get around legislation by some countries against reception of Ku-band transmissions. DBS systems are generally based on proprietary transport stream encoding and/or encryption..................[:=> Show Contents <=:]

Crystalline silicon solar cell

Posted by: Computer Science Clay
Created at: Sunday 25th of January 2009 01:24:35 PM
Last Edited Or Replied at :Sunday 21st of August 2011 11:24:33 PM
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There are three main types of solar cells in production: silicon wafer based (also known as crystalline Si or c-Si), compound crystalline (concentrator PV), and thin-film solar (TFS). Crystalline silicon solar cells are by far the predominant technology, currently accounting for 80-85% of all cells manufactured. TFS has recently grown to 15-20% of world production as a result of continuing shortages of solar grade silicon wafers and advances in thin-film technology. Compound crystalline solar cells, based on compound semiconductor materials, deliver high efficiency, but their high cost l..................[:=> Show Contents <=:]

Optical Satellite Communication

Posted by: computer science crazy
Created at: Monday 22nd of September 2008 02:22:15 PM
Last Edited Or Replied at :Monday 22nd of September 2008 02:22:15 PM
Communication , Satellite, Optical , optical sattilite communication, optical satellite communication , why use sout in optical satelite,
and military reconnaissance system.

The LEO terminal is referred to as a user terminal since it enables real time transfer of LEO instrument data back to the ground to a user access to the DRS s LEO instruments generate data over a range of bit rates extending of Mbps depending upon the function of the instrument. A significant proportion have data rates falling in the region around and below 2 Mbps. and the data would normally be transmitted via an S-brand microwave IOL

ESA initiated a development programme in 1992 for LEO optical IOL terminal targeted at the segment of the user commun..................[:=> Show Contents <=:]

Direct to home television DTH

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:26:57 AM
Last Edited Or Replied at :Monday 01st of August 2011 11:18:36 PM
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tellite TV viewers were explorers of sorts. They used their expensive dishes to discover unique programming that wasn't necessarily intended for mass audiences. The dish and receiving equipment gave viewers the tools to pick up foreign stations, live feeds between different broadcast stations, NASA activities and a lot of other stuff transmitted using satellites. Some satellite owners still seek out this sort of programming on their own, but today, most Direct to home TV customers get their programming through a direct broadcast satellite (DBS) provider, such as DirecTV or the Dish Network. Th..................[:=> Show Contents <=:]

Optical Satellite Communication

Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:59:53 PM
Last Edited Or Replied at :Wednesday 16th of January 2013 12:55:58 AM
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to place Satellites carrying optical terminals in GEO orbit within the next decade. The first is the ARTEMIS technology demonstration satellite which carries both microwave and SILEX (Semiconductor Laser Intro satellite Link Experiment) optical interorbit communications terminal. SILEX employs direct detection and GaAIAs diode laser technology; the optical antenna is a 25cm diameter reflecting telescope.

The SILEX GEO terminal is capable of receiving data modulated on to an incoming laser beam at a bit rate of 50 Mbps and is equipped with a high power beacon for initial link acquisition t..................[:=> Show Contents <=:]

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