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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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apacity of onboard data recorders will be several terabytes; and
the number of bits per pixel will be larger than 13. The acquired information will drastically increase with
monitoring frequency, observation area and the resolution of the images. Monitoring from satellites will
not only be done for special area but real-time observations of the entire world will take place.
Gigabit-per-second-class direct links to ground stations will be necessary during the short download time
of the direct communication link from a LEO satellite. Optical communication systems are preferable for
this in..................[:=> 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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, which can perform all functional operations in optical mode. In recent years, a number of devices that can ultimately lead us to real optical computers have already been manufactured. These include optical logic gates, optical switches, optical interconnections and optical memory.

Current trends in optical computing emphasize communications, for example the use of free space optical interconnects as a potential solution to remove ËœBottlenecksâ„¢ experienced in electronic architectures. Optical technology is one of the most promising, and may eventually lead to new computing applic..................[:=> Show Contents <=:]


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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st Super-High-Frequency (SHF) airborne satellite communication (Satcom) terminals, which are due to enter service on Nimrod maritime reconnaissance aircraft (MRA4). Satcom terminals using the Ultra-High-Frequency (UHF) band have been fitted to larger aircrafts for a number of years. Although relatively simple to install and comparatively inexpensive, UHF satcoms(240-270 & 290-320 MHz bands) suffers from very limited capacity (a few 25 KHz channels per satellite) and are prone to multipath & unintensional interference due to their poor antenna selectivity. SHF satcoms (7.25 ? 7.75 & 7.9-8.4 GHz..................[:=> 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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Direct-To-Home is a relatively 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 strea..................[:=> 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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nocrystalline wafers are more efficient than polycrystalline-based wafers. Dopants are added during the ingot growth process, creating p-type wafers (electron deficient) or n-type wafers (electron rich). Most c-Si solar cells are manufactured on p-type wafers, but there are some companies who use n-type wafers (heterojunction or HIT PV cells). The ingots are sliced into very thin wafers, ranging from 180 to 240?m in thickness, washed, inspected for breakage, and sorted.

The silicon manufacturing process requires vacuum pumps that work reliably in dusty environments because a crystal grower ..................[:=> 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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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 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..................[:=> 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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signals using specialized antennas called satellite dishes.
The television satellites are all in geosynchronous orbit approximately 35,700 km above the Earth. In this way you have to direct the dish at the satellite only once, and from then on it picks up the signal without adjustment.
More than 200 channels with excellent audio and video are made available. The dish required is quite small (30 to 95 cm in diameter).

The Overall System
Early satellite TV viewers were explorers of sorts. They used their expensive dishes to discover unique programming that wasn't necessarily intended..................[:=> 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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eam 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 of transmitting data to the GEO terminals. A w..................[:=> Show Contents <=:]

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