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Optical Satellite Communication (Laser)
Transcript of Optical Satellite Communication (Laser)
Roummoney Pen Satellite How it works Super-high-speed Optical
Communication Concept Problems with communication Sources Importance of interstellar communication Communication lags due to:
- Digital compression
- Bandwith limitation Laser Communications Relay Demonstration, which would use laser beams to transfer data between spacecraft and stations on Earth at 10 to 100 times the speeds currently available. Lasers travel at the speed of light
and transmit data http://gcaptain.com/12-gbps-bandwidth-via-satellite-possible-but-will-it-be-available-at-sea/
Communication Basics of a Satellite Bus Power Onboard Computer
Altitude Control System
Radio System & Antenna Metal composite body Nuclear power for
planetary exploration Object revolving around a circular or elliptical path Orbits Geostationary - Same spot
Asynchronous - Pass overhead aat different times of the day
Polar - Pass planet's pole on each revolution Objective To get satellite in space:
Balance b/w gravity to achieve orbital velocity Definition The overcrowded airwaves are also prone to interference, or “fratricide” as radio engineers like to call it. Adversaries can also try to intercept messages or jam signals.
Radio frequency transmissions can go to 200 megabytes per second, but 45 megabytes is more typical If the method proves to be feasible, astronauts on Mars could transmit data back to Earth at speeds of 100 Mbps or more, which is at least several times faster than the broadband Internet connections that the most technologically advanced ordinary Joes have in their homes. Conceivably, it would be possible to transmit a photographic image from Mars to Earth in about five minutes, compared to the 90-minute wait that scientists operating robotic rovers on the Red Planet presently must endure
The distance between Mars and Earth averages Practical Application How it works
Laser communications, which transmits ones and zeroes in a data stream through narrow beams of energy, is not unlike widely used fiber-optic cable — it just doesn’t have the cable. Practical Application
Satellites above Earth use hyperspectral cameras to gather data across different wavelengths of light, peering inside hurricanes and tracking wildfires. Because of their proximity to ground-receiving stations, these satellites can transmit loads of data. But over millions of miles of interplanetary space, those signals lose their coherence and strength, and so it would take ages to download such sensitive measurements of, say, storms in Jupiter's atmosphere. Using laser communications could provide the bandwidth for hyperspectral camera data from afar, while also freeing up the energy and payload volume to allow for sending better equipment in the first place. Two gigabytes per second and upwards
of 20 gigabytes per second are possible.