Laser transmission system information showed very high efficiency




Laser transmission system information showed very high efficiency


This week, space agency NASA has published the results of the technology demonstrator space laser communication (LLCD), installed on the “Explorer of the lunar atmosphere and dust environment” (or Ladee ), launched in September this year and is currently circling around our natural satellite. With the words Space Agency, the system LLCD showed very high data transmission efficiency at a distance of about 400,000 kilometers and now is able to work no worse, and perhaps even better than normal radios.

For those who do not know LLCD mission is aimed at demonstrating the possibility of practical use of lasers to transmit messages between objects in a very remote distance from each other and a much higher rate than the one that can offer standard radios. Demonstrating the ability to transmit data back to Earth at a speed of 622 MB / s and have a speed of 20 MB / s, LLCD established October 20 speed record data from lunar orbit. Data transmitted by the laser beam were obtained main LLCD-ground station located in New Mexico. In the world there are three such stations. The remaining two are located in Spain and the USA.

The most important advantages of lasers over the radio transmitters are that they offer much more bandwidth and, moreover, to transmit information by short laser beams that in the long term will reduce the overall cost power consumption when transmitting information on sverhudalennye distance.

In NASA noted that the system LLCD runs for a 30-day test mode is even better than that was expected of her. Laser without problems transmit messages to ground stations in daylight and even when the deflection angle of the moon relative to the Sun was four degrees. The system also worked without any errors, when the moon was very low to the horizon, thereby causing the laser to pass through the denser layers of the atmosphere and at a certain impact the effects of turbulence. Astronomers were also surprised to learn that light cirrus clouds were not for the laser problem.


Probe LADEE Moon orbit in the representation of the artist (Image: NASA)

In addition to checking for errors, LLCD showed the ability to switch from one ground station to another, demonstrating the ability to bind to a particular station without the need to use the radio.

“We programmed LADEE so that it is automatically activated and directed LLCD system to the desired point of the laser signal for transmission to Earth, without any need for pre-sent to the radio probe with the team,” – says Don Cornwell, project manager LLCD Space Flight Center Goddard.

“The success of this mission allows for optimism about the possibility of using such systems as the main communication systems in future missions NASA».

In the NASA mark not only the success signal, but also high speed data transmission from the probe to the ground. All collected data during this time (and it is, for a moment, gigabytes of data), were transferred to the Earth in less than five minutes. Typically, such a volume of data transmission takes a few days.


Optical module system LLCD

The agency reports that LLCD mission completed and the next phase of testing will be the verification of satellite Laser Communications Relay Demonstration (LRCD), scheduled for launch in 2017. At its core, the system will be an improved version LLCD, capable of data transfer rates of up to 2880 Gb / s from geostationary orbit and will be part of the five-year testing program communications systems of the new generation.

Located below the video contains chapters congratulations NASA Charles Bolden transferred to the moon and back, using a new laser communication systems.

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Tags: Ladee , Lasers .

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