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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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e measurements, higher resolution will be required from onboard sensors
and the frequency and area of the observations will increase. Figures 1 and 2 show trends in the data rate
and resolution of the sensors for non-military Earth observation satellites. The trends cover optical
sensors and RF synthetic aperture radar (SAR) systems via intersatellite and direct communication links
to ground stations . The data rates seem to drop with passing time for GEO. However, the data relay
satellites and commercial communication satellites are not included in the figure. As recently launched
co..................[:=> 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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romising, and may eventually lead to new computing applications as a consequence of faster processing speed, as well as better connectivity and higher bandwidth.

2. NEED FOR OPTICAL COMPUTING

The pressing need for optical technology stems from the fact that todayâ„¢s computers are limited by the time response of electronic circuits. A solid transmission medium limits both the speed and volume of signals, as well as building up heat that damages components.

One of the theoretical limits on how fast a computer can function is given by Einsteinâ„¢s principle that signal cannot ..................[:=> Show Contents <=:]



FUTURE SATELLITE COMMUNICATION


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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rts such as helicopter rotor blades, propellers and jet engines.

This paper gives an overview of development of airborne SHF and ..................[:=> Show Contents <=:]



DIRECT BROADCAST SATELLITE DBS


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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e 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 requiring proprietary reception equipment. Service providers sometimes license several manufacturers to provide equipment capable of receiving the proprietary streams. This equipment ty..................[:=> 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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present in the wafer. In general, c-Si solar cells are manufactured using mono- or polycrystalline wafers, but some manufacturers use ribbons of silicon to minimize the amount of Si used and hence their costs.

In the first steps of the c-Si manufacturing process, high purity silicon ingots are grown either by the Czochralski method of crystal growing (monocrystalline Si ingots) or the die-casting/furnace method (polycrystalline Si ingots). Solar cells fabricated on monocrystalline wafers are more efficient than polycrystalline-based wafers. Dopants are added during the ingot growth process..................[:=> 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
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ving 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 together with a low divergence (and unmodulated) beam which is tracked by the communicating partner. ARTEMIS will be followed by the operational European data relay system (EDRS) which is planned to have data relay Satellites (DRS). These will also carry SILEX optical data relay terminals.

Once these elements of Europe's space Infrastructure are in place, these will be a need for optical communications terminals on LEO satellites which are capable o..................[:=> 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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smaller antenna. The main limitation of broadcast television is range. The radio signal used to broadcast television shoot out from the broadcast antenna in a straight line. Inorder to receive these signals, you have to be in the direct line of sight of the antenna. Small obstacles like trees or small buildings aren't a problem; but a big obstacle, such as Earth, will reflect these waves. If the Earth were perfectly flat, you could pickup broadcast television thousands of miles from the source. But because the planet is curved, it eventually breaks the signal's line of sight. The other prob..................[:=> 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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ry SILEX optical data relay terminals.

Once these elements of Europe's space Infrastructure are in place, these will be a need for optical communications terminals on LEO satellites which are capable of transmitting data to the GEO terminals. A wide range of LEO space craft is expected to fly within the next decade including earth observation and science, manned 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 ove..................[:=> Show Contents <=:]



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