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18-08-2017, 12:45 PM

plz send me seminar report & ppt on laser broadband from NASA

jaseela123d · 19-08-2017, 10:06 AM

When NASA's Lunar Communications Communication (LLCD) demonstration begins operation on board the Lunar Environment and Dust Explorer (LADEE) mission managed by the NASA Ames Research Center in the field Of Moffett, Calif., Will attempt to demonstrate two-way laser communication beyond the ground is possible, expanding the possibility of transmitting huge amounts of data. This new capability could one day allow high-definition 3-D video transmissions into deep space to become routine.

"The purpose of the LLCD experiment is to validate and build trust in this technology for future missions to consider its use," said Don Cornwell, LLCD manager. "This unique capability developed by MIT (Lincoln Laboratory of the Massachusetts Institute of Technology) has incredible application possibilities and we are very excited to bring this instrument out of the ground."

Since NASA first ventured into space, through moon landings, shuttle program, and unmanned exploration missions, radiofrequency communication also known as RF, has been the communications platform used . But RF is reaching its limit just as the demand for more data capacity continues to rise. The development of laser communications will give NASA the ability to extend communication applications such as higher image resolution and even 3D video transmission in deep space.

LLCD is NASA's first dedicated system for bidirectional communication using laser instead of radio waves. "LLCD is designed to send six times more data from the moon with a smaller transmitter with 25 percent less power compared to the equivalent of the next generation radio (RF) system," said Cornwell. "Lasers are also safer and less susceptible to interference and jamming."

The LLCD experiment is housed aboard NASA's LADEE: a 100 day robotic mission designed, built, integrated, tested and will be operated by Ames. LADEE will try to confirm if the dust caused a mysterious glow in the astronauts of the lunar horizon observed during several missions of Apollo and to explore the tenebrous and exotic atmosphere of the Moon. The launch of the LADEE spacecraft is scheduled for September aboard a Minotaur V rocket from the United States Air Force, an excess ballistic missile converted into a space launch vehicle operated by Orbital Sciences Corp. of Dulles, Va. ., De Wallops, Virginia.

The LADEE spacecraft will take 30 days to reach the Moon due to its flight path. LLCD will begin operations soon after its arrival in lunar orbit and will continue for 30 days thereafter.

The main purpose of the LLCD's mission is to transmit hundreds of millions of data bits per second from the moon to Earth. This is equivalent to simultaneously transmitting more than 100 channels of HD television. The LLCD receiving capability will also be tested when tens of millions of bits per second are sent from Earth to the spacecraft. These demonstrations will demonstrate that the technology to increase the bandwidth for future missions is possible.

There is a primary ground terminal at NASA's White Sands Complex in New Mexico to receive and transmit LLCD signals. The MIT team designed, built and tested the terminal. They will also be responsible for the LLCD operation on that site.

There are two alternate sites, one located at the NASA Jet Propulsion Laboratory in California, which is to receive only. The other is being provided by the European Space Agency on the Spanish island of Tenerife, off the coast of Africa. Will have two-way communication capability with LLCD. "Having multiple sites gives us alternatives that greatly reduces the possibility of cloud interference," Cornwell said.

LLCD is a short-lived experiment and the precursor to NASA's long-running demonstration, the Laser Communications Relay Demonstration (LCRD). It is also part of the technology demonstration missions program of the agency, which is working to develop a cross-cutting technology capable of operating in the rigors of space. LCRD is scheduled to launch in 2017.

NASA engineers believe that this technology becomes even more advantageous for communications beyond Earth's orbit. In the past, NASA has experimented with sending small amounts of individual pulses to chambers in space probes very far away near Jupiter, Mars and Mercury.

Recently, an image of Leonardo da Vinci's painting, the Mona Lisa, was transmitted to the NASA Lunar Reconnaissance Orbiter (LRO) spacecraft orbiting the moon. "But this was done with hundreds of bits of data per second," Cornwell said. "LLCD will be the first dedicated optical communication system and will send data millions of times faster."

The European Space Agency has already successfully demonstrated laser communication between satellites in Earth orbit. They recently launched Alphasat to demonstrate the laser transmission between a low-orbiting satellite and a satellite in geostationary orbit. The LLCD laser link from the moon will be ten times further.

NASA is considering laser communication as the next paradigm shift in future spatial communication, especially deep space. "We can even imagine a laser-based system that allows a robotic mission to an asteroid," said Cornwell. "It could have 3-D high-definition video signals transmitted to Earth by essentially providing 'telepresence' to a human controller on the ground."

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