first inter-satellite laser link made - laser distance

by:UMeasure     2019-09-19
first inter-satellite laser link made  -  laser distance
Will Netta Dragon
Distance laser communication link between two Earth
Orbit satellites were first established.
The technology allows fast-moving low-Earth orbit satellites to transmit information to the ground almost instantly by stationary satellites fixed in higher orbit.
The experimental laser sends data at a rate of 5 megabits per second, allowing the sending of still images.
But the capacity of the latest laser system is much larger and can be used to transmit communication or video.
"These links will be used by the next generation of commercial satellites," said Gotthard opppenuser, project manager at the European Space Agency (ESA)
On the satellite platform.
"We have to focus on the next generation of lasers.
This could be the size of a quarter with a data rate of 5 gigabytes per second.
A laser connection was established between Esa's Artemis and France
Construction of observation satellite point 4.
This connection is used to relay Earth images taken by SPOT 4.
Four connections were established between 4 and 20 minutes of duration.
International military program for American development
Although the status of the project is unclear, satellite laser communications existed in the late 1990 s.
However, its goal is to allow the distance from the low Earth orbit to the rest of the Earth orbit to be more than 2500 km kilometers, too short.
Retrieving data from surveillance satellites such as SPOT 4 can now take several hours.
Satellites must store information until their orbit allows them to see the base stations on Earth and then send data over a radio link.
Oppenäuser & colon said the new technology will improve the speed and quality of many satellite communications;
"By using data relay, you can greatly increase the time of contact with the Earth.
"The laser is also more compact, safer, and requires less power than radio transmitters and receivers.
But they have to operate very precisely.
Artemis is located on a fixed Earth stationary orbit 31,000 kilometres from Earth, while SPOT 4 operates at a speed of 7000 metres per second at a height of 832 kilometres.
The laser link between the two is only a few meters wide.
In order to establish an accurate link, Artemis scanned an area of 300 km in a wide range of 30-km-
Locate the wide laser beacon of SPOT 4.
The beam is then scaled down to the optimum width, allowing a large amount of data to be sent quickly.
The satellites used an experimental laser system called SILEX developed by ESA and the French National Space Agency.
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