Mona Lisa "cletala" on the moon

NASA engineers have transferred to lunar orbit image of the famous painting by Leonardo da Vinci - "Mona Lisa." The painting served as a demonstration of the first in the history of space communication system based on a laser beam. NASA claims that in the near future, the technology could provide an alternative to traditional radio communication satellites and in the future to provide humanity with a broadband connection.



The picture of the Mona Lisa has overcome a laser beam of 350 thousand. Kmilometrov - from laser station NGSLR US LRO probe in lunar orbit. The digital reproduction of the painting was divided into an array of 152 × 200 pixels, each of which is assigned a shade of gray, the coded number from 0 to 4095. In this way, each pixel is coded individual short laser pulse, which was passed in 4096 one of the gaps within a certain time window . Transfer rate is 400 bits per second.

Turbulent flows in the Earth's atmosphere have made unavoidable with this method of transmission of noise and interference, even with clear sky. To get rid of their influence, they were used Reed-Solomon codes - widely used method for data recovery, including reading data from the CD / DVD.

Then Mona Lisa handed back to Earth the traditional radio and engineers compared it with the original image and were able to verify that this method of communication is quite viable.

via factroom.ru