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free space laser communications seminar ppt free download


Posted by:
Created at: Thursday 20th of December 2012 03:08:50 AM
Last Edited Or Replied at :Thursday 26th of June 2014 12:22:09 PM
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Free Space Laser Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:13:29 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:13:29 AM
Communications , Laser, Space , Free, seminar topics on free space laser communication , free space laser communications seminar ppt free download, laser communications seminar ppt free download , space electricity, secure based laser communication , seminar on free space laser communication,
also terminal control electronics that must control the gimbals and other steering mechanisms, and servos, to keep the acquisition and tracking system operating in the designed modes of operation.

Operation
Free space laser communications systems are wireless connections through the atmosphere. They work similar to fiber optic cable systems except the beam is transmitted through open space. The carrier used for the transmission of this signal is generated by either a high power LED or a laser diode. The laser systems operate in the near infrared region of the spectrum. The laser light acro..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Monday 22nd of September 2008 12:11:49 AM
Last Edited Or Replied at :Tuesday 05th of February 2013 12:32:14 PM
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y over the past three decades have made laser communications in space not only a viable but also a attractive approach to intersatellite link applications. The high data rate and large information throughput available with laser communications are many times greater than in radio frequency (RF) systems.

The small antenna size requires only a small increase in the weight and volume of host vehicle. In addition, this feature substantially reduces blockage of fields of view of the most desirable areas on satellites. The smaller antennas, with diameters typically less than 30cm, create less mo..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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up, but has some properties of the 1st. Many aspects are related to fibre optics with the difference, that the media is air and not fibers. Therefore are the required devices similar to those used with fibers.

The advantages of such a system are the following:
_ No need for digging up the roads
_ No radio frequency licenses are required
_ Bandwidth is equal or superior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well s..................[:=> Show Contents <=:]



MPEG-4 Facial Animation


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:08 PM
Last Edited Or Replied at :Thursday 13th of January 2011 11:13:28 PM
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rtistic and exaggerated deformation. In either case the visual quality must be good.

3). Fast download: to reduce the delay of downloading model, we need to develop low resolution and less complex model (e.g. use of compressed model from Shout3D) and compress the size of data needed for animation (FAT). Some download sizes of files are described later.

4). Real time interactivity: our virtual presenter must be able to interact in different ways depending upon the user. In this case, video streaming or preprocessing is not possible. Thus, parameterized animation of the virtual presenter i..................[:=> Show Contents <=:]



3D PC Glasses


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:07:24 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:09:04 AM
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n a computer monitor...and that s a flat surface.
That s where PC 3-D glasses come in. They re designed to convince your brain that your monitor is showing a real, three-dimensional object..................[:=> Show Contents <=:]



Laser Communication Systems


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:40:09 AM
Last Edited Or Replied at :Friday 02nd of April 2010 11:54:08 PM
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ny sensitive satellite sensors. Fewer on board consumables are required over the long lifetime because there are fewer disturbances to the satellite compared with heavier and larger RF systems. The narrow beam divergence affords interference free and secure operation.



Background
Until recently, the United States government was funding the development of an operational space laser cross-link system employing solid-state laser technology. The NASA is developing technology and studying the applicability of space laser communication to NASA's tracking and data relay network both as cross-..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:13:29 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:13:29 AM
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this feature substantially reduces blockage of fields of view of the most desirable areas on satellites. The smaller antennas, with diameters typically less than 30cm, create less momentum disturbance to any sensitive satellite sensors. Fewer onboard consumables are required over the long lifetime because there is less disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

Features Of Laser Communications System
A block diagram of typical terminal is illustrated in Fig 1. Information, typicall..................[:=> Show Contents <=:]



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