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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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s 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..................[:=> 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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semiconductor vertical cavity surface emitting laser diode that emits light in a cylindrical beam vertically from the surface of a fabricated wafer, and offers significant advantages when compared to the edge-emitting lasers currently used in the majority of fiber optic communications devices. The principle involved in the operation 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 mirro..................[:=> 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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expensive, 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) offer significantly increased bandwidths (hundreds of MHz) for high data rates or increased use of spread-spectrum techniques, together with localised coverage and adaptive antenna techniques for nulling unwanted signals or interference.

For airborne platforms, the advantages of SHF satcoms come at the expense of a significant addition..................[:=> 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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ry streams. This equipment typically uses a smart card as part of the decryption system or conditional access. This measure assures satellite television providers that only authorised, paying subscribers have access to Pay TV co..................[:=> 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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ell manufacturing requires vacuum-based processing tools for many critical steps, from mono- to polycrystalline silicon growth to thin-film depositions on silicon wafers. Manufacturing efficiencies can be optimized by considering cost-of-ownership (CoO) parameters for vacuum subsystems based on dry pumps. Careful attention to vacuum systems can make a significant contribution to reduced costs, ultimately permitting profitable production of solar cells that will encourage widespread market growth.

Solar energy is rapidly becoming a viable alternative to fossil fuels. While solar sources curr..................[:=> 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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eriment) 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 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..................[:=> 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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anet is curved, it eventually breaks the signal's line of sight. The other problem with broadcast television is that the signal is often distorted even in the viewing area. To get a perfectly clear signal like you find on the cable one has to be pretty close to the broadcast antenna without too many obstacles in the wave.

DTH Television solves both these problems by transmitting broadcast signals from satellites orbiting the Earth. Since satellites are high in the sky there are a lot more customers in the line of sight. Satellites television systems transmit and receive radio signals using ..................[:=> 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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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 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 developmen..................[:=> Show Contents <=:]



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