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free space laser communications seminar ppt


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Created at: Thursday 31st of January 2013 03:12:57 AM
Last Edited Or Replied at :Thursday 31st of January 2013 03:12:57 AM
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i need a theory for proj..................[:=> Show Contents <=:]



SPACE LASER COMMUNICATIONS


Posted by: project report helper
Created at: Friday 24th of September 2010 04:50:06 AM
Last Edited Or Replied at :Wednesday 03rd of November 2010 06:35:13 AM
COMMUNICATIONS , LASER, SPACE , space lazer communication, free space laser communications seminar pdf , free space laser communications seminar, subin km free space laser communication seminar report , subin km freespace laser communication seminar, free space laser communications seminar topic , seminar on free space laser communications, laser communications , space laser communications, space laser communication , free space laser communications,
ellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

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Optical Communications in Space


Posted by: computer science crazy
Created at: Wednesday 16th of September 2009 02:07:52 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:43 AM
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ast, additional R&D activities were undertaken to develop attractive second-generation systems, particularly for the commercial satellite market. Indeed, at the turn of the century, literally thousands of intersatellite links - radio-frequency (RF) and optical - are expected to be in operation in commercial multi-satellite constellations providing mobile communications, video conferencing and multimedia services. The race is on for the European laser communication industry to enter this lucrative market. Optical technology offers too many advantages in terms of mass, power, system flexibility ..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:13:36 AM
Last Edited Or Replied at :Friday 02nd of April 2010 11:54:15 PM
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f uncertainty in the 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 ..................[:=> 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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ng 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 across the link is at a wavelength of between 780 - 920 nm. Two parallel beams are used, one for transmission and one for reception.

Acquisiti..................[:=> 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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ce communication can be used to interconnect LAN's in campus or indu..................[:=> 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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n satellite frequencies under consideration by WARC. The basic objective is to..................[:=> 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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ics 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 acquisition and tracking system operating in the..................[:=> Show Contents <=:]



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