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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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rvation satellites
Many Earth observation satellites have been developed for weather forecasting and for probing our
environment. For more accurate 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 pa..................[:=> 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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tly 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 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 o..................[:=> 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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z 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 additional burden in terms of antenna siting and pointing, particularly for smaller, highly agile aircrafts..................[:=> 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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with standard equipment available in the market...................[:=> 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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frictional wear and vibration, resulting in maintenance intervals as long as five years. An additional advantage of mag-lev is the elimination of lubricants that can be vulnerable to oxidation in corrosive environments, which can lead to premature failure.

After the PSG has been removed, a layer of silicon nitride is deposited on the front surface of the cell to reduce reflection (ARC) and passivate the surface. Typically the layer is deposited using plasma-enhanced chemical vapor deposition (PECVD) or physical vapor deposition (PVD). PECVD gases and byproducts-such as SiH4, NH3, NF3, F2, ..................[:=> 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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ollowed 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 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 i..................[:=> 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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cTV or the Dish Network. The provider selects programs and broadcasts them to subscribers as a set package. Basically, the provider's goal is to bring dozens or even hundreds of channels to your television in a form that approximates the competition, cable TV. Unlike earlier programming, the provider's broadcast is completely digital, which means it has much better picture and sound quality. Early satellite television was broadcast in C-band radio -- radio in the 3.4-gigahertz (GHz) to 7-GHz frequency range. Digital broadcast satellite transmits programming in the Ku frequency range (12 GHz to..................[:=> 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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e 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). 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 termina..................[:=> Show Contents <=:]



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