Subscribe free to our newsletters via your
. Space Travel News .

A Laser Message from Space
by Dr. Tony Phillips
Washington DC (SPX) Jun 23, 2014

A new ScienceCast video explains how the OPALS laser beam transmits HD video to Earth.

Anyone who remembers dialup internet can sympathize with the plight of NASA mission controllers. Waiting for images to arrive from deep space, slowly downloading line by line, can be a little like the World Wide Web of the 1990s. Patience is required.

A laser on the International Space Station (ISS) could change all that. On June 5th, 2014, the ISS passed over the Table Mountain Observatory in Wrightwood, California, and beamed an HD video to researchers waiting below. Unlike normal data transmissions, which are encoded in radio waves, this one came to Earth on a beam of light.

"It was incredible to see this magnificent beam of light arriving from our tiny payload on the space station," says Matt Abrahamson, who manages the Optical Payload for Lasercomm Science at NASA's Jet Propulsion Laboratory.

Better known as "OPALS," the experimental laser device was launched to the space station onboard a Space-X Dragon spacecraft in the spring of 2014. Its goal is to explore the possibility of high-bandwidth space communications using light instead of radio waves. If successful, researchers say OPALS would be like an upgrade from dial-up to DSL, achieving data rates 10 to 1,000 times higher than current space communications.

So far so good.

The entire transmission on June 5th lasted 148 seconds and achieved a maximum data rate of 50 megabits per second. It took OPALS 3.5 seconds to transmit a single copy of the video message, which would have taken more than 10 minutes using traditional downlink methods. The message was sent multiple times during the transmission.

Abrahamson says "the video is an homage to the first output of any standard computer program: 'Hello, World.'"

Because the space station whips around Earth at 17,500 mph, "laser-tagging" a telescope on the fast-moving ground below can be tricky. To accomplish the precision tag-up, a laser at the ground station illuminated the station.

OPALS responded by sending its own 2.5 watt encoded laser signal right back in the same direction, carrying the HD video. During the 148-second transmission, OPALS maintained pointing to the ground station within 0.01 degrees while tracking at speeds up to 1 degree per second.

"NASA missions collect an enormous amount of data out in space," says Abrahamson. "Laser communications is a faster alternative for getting those data to the ground."

"With this demonstration, we're paving the way for the future of communications to and from space."


Related Links
NAC Science Committee
Station at NASA
Station and More at Roscosmos
S.P. Korolev RSC Energia
Watch NASA TV via Space.TV
Space Station News at Space-Travel.Com

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

D-Day for the International Space Station
Sydney, Australia (SPX) Jun 18, 2014
So, Russia hasn't stopped operations on the International Space Station. Soyuz spacecraft will continue to carry cosmonauts and astronauts there, despite growing international tensions on Earth. We can all breathe easy for a moment. Okay, that's done. Now it's time to consider what happens next. It would seem that things will probably remain on a similar course until 2020. After that, who ... read more

Arianespace A World Leader In The Satellite Launch Market

Airbus Group and Safran To Join Forces in Launcher Activities

European satellite chief says industry faces challenges

Payload fueling begins for nexy Arianespace Soyuz flight

NASA Invites Comment on Mars 2020 Environmental Impact Statement

Opportunity is exploring the west rim of Endeavour Crater

Discovery of Earth's Northernmost Perennial Spring

US Congress and Obama administration face obstacles in Mars 2030 project

NASA LRO's Moon As Art Collection Is Revealed

Solar photons drive water off the moon

55-year old dark side of the moon mystery solved

New evidence supporting moon formation via collision of 2 planets

The PI's Perspective - Childhood's End

Final Pre-Pluto Annual Checkout Begins

Hubble Begins Search Beyond Pluto For Potential Flyby Targets

Cracks in Pluto's Moon Could Indicate it Once Had an Underground Ocean

Mega-Earth in Draco Smashes Notions of Planetary Formation

Kepler space telescope ready to start new hunt for exoplanets

Astronomers Confounded By Massive Rocky World

Two planets orbit nearby ancient star

Companies to merge expertise for space program products

ULA Signs Multiple Contracts for Next-Gen Propulsion Work

Why We Need Rocket Engines

NASA again delays flying saucer test

Chinese lunar rover alive but weak

China's Jade Rabbit moon rover 'alive but struggling'

Chinese space team survives on worm diet for 105 days

Moon rover Yutu comes closer to public

NASA's Swift Satellite Tallies Water Production of Mars-bound Comet

NASA Announces Latest Progress in Hunt for Asteroids

The Role Of Amateur Astronomers In Rosetta's Mission

Giant Telescopes Pair Up to Image Near-Earth Asteroid

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.