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free space laser communications seminar ppt free download


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Created at: Thursday 20th of December 2012 03:08:50 AM
Last Edited Or Replied at :Friday 21st of December 2012 12:17:53 AM
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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,
digital data, is input to data electronics that modulates the transmitting laser source. Direct or indirect modulation techniques may be employed depending on the type of laser employed. The source output passes through an optical system into the channel. The optical system typically includes transfer, beam shaping, and telescope optics. The receiver beam comes in through the optical system and is passed along to detectors and signal processing electronics. There are also terminal control electronics that must control the gimbals and other steering mechanisms, and servos, to keep the acquisiti..................[:=> 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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location of receiver. The receiver field of includes the location uncertainty of the transmitter. Unfortunately, this ideal method requires a significant amount of laser power.

It is possible to operate a number of laser types at high peak power and low duty cycle to make acquisition easier. This is because a lower pulse rate is needed for acquisition than for tracking and communications. High peak power pulses more easily overcome the receiver set threshold and keep the false alarm rate low. A low duty cycle transmitter gives high peak power, yet requires less average power, and is thus a ..................[:=> 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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vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering elements in the air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to side even settle into the ground causing offset to the laser beam and making the receiver laser receive less power)

Applications

Free ..................[:=> 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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processing is not possible. Thus, parameterized animation of the virtual presenter is of importance, and we choose MPEG-4 FAP as these parameters. One example of this interactivity is under development for the IST Interface project, where a Dialogue Manager, a TTS and a Phoneme/Bookmark converter provide real time dialogue and animation. - Easy web integration: integration of this applet in web pages should be easy and must allow communication between the applet and the html pages. This communication, to select a model and some visual parameters, uses JavaScript.

The current implementation..................[:=> 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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ince your brain that your monitor is showing a real, three-dimensional object. In order to understand quite how this works, we need to know what sort of work our brain does with the information our eyes give it. Once we know about that, we ll be able to understand just how 3-D glasses do their job...................[:=> 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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momentum disturbance to any 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 re..................[:=> 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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formatting, and component technology 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 typic..................[:=> Show Contents <=:]



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