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NASA and ESA To Demonstrate Earth-Moon Laser Communication
cylonlover writes with this news bite about a cool new ground to space laser communication system from NASA and ESA: "Space communications have relied on radio since the first Sputnik in 1957. It's a mature, reliable technology, but it's reaching its limits. The amount of data sent has increased exponentially for decades and NASA expects the trend to continue. The current communications systems are reaching their limits, so NASA and ESA are going beyond radio as a solution. As part of this effort, ESA has finished tests of part of a new communications system, in preparations for a demonstration in October in which it will receive a laser data download from a NASA lunar orbiter."
Maybe this is part of the reason why SETI hasn't picked up anything yet...
Maybe we will get someone out there.. finally? :)
The sharks simply won't stand still while the communication is being done.
Well, considering the number of and resolution of images sent back Mars and the moon and various spacecraft is limited by the amount of time it takes to transmit all that data, and the amount of power it takes to transmit it...this is a no brainer. It's advantages are so blatantly obvious that it's kind of sad you can't see that. Are you sure you belong here?
Of all the programs our government spends money on, you pick up NASA? I can see your argument with regard to having a manned space program which costs a great deal more. But this? Especially when it has clear commercial potential. WTF?
Destructively "bouncing" a laser is easy. Just point it in the general direction, and apply power until there's too much extra energy for the target to handle.
Communication is more difficult, because not only do you have to point in exactly the right direction, from far further away (or have ridiculously more power), but you then have to modulate the laser appropriately to transmit data, and do so in such a way that atmospheric or other line-of-sight disturbances won't be too much of a problem, and you have to keep doing it long enough to send all you data through, and ideally even have a matching receiver to pick up the return direction.
You do not have a moral or legal right to do absolutely anything you want.
TCP/IP with freakin' lasers!
I was too lasey to read the article, so it would have been nice if the video was more illuminating, but at least its coherent.
Ill be ok with spending tons of money on space when our sick are taken care of instead of left dying for lack of coverage. .. really .. till then it's just shaming us all .
Ill be ok with spending tons of money when the elderly are taken care of properly , same with our war veterans we abandoned.
Ill be ok with it then
Do you have any idea how much we spend on healthcare and on NASA??
Why can't scientists do something about that?
My sources tell me that's not going to happen until 2208.
#DeleteChrome
Ill be ok with spending tons of money on space when our sick are taken care of instead of left dying for lack of coverage. Ill be ok with spending tons of money when the elderly are taken care of properly , same with our war veterans we abandoned. Ill be ok with it then .. really .. till then it's just shaming us all .
Stop spending trillions on "defense" and you can take care of the sick and elderly, educate the young, feed the hungry, pave the roads and repair the bridges., and still have enough left over to explore space.
When our name is on the back of your car, we're behind you all the way!
I'm replying to this high-scoring comment not only because I want to be noticed and get mod points, but because I have expertise and experience in the field.
As long as you know the characteristics of the optical medium, you can with some certainty use techniques similar to these.
-- Ethanol-fueled
Coincidentally, a "space engineer" whose blog I read recently mentioned something similar as a way to generate revenue from the early phase of a lunar mining operation. I'm not sure I buy the numbers, but it's an interesting concept:
I can immediately generate revenue from the use of the laser communications system. Utterly secure, 25 gigabits/sec communications with an unhackable data server would easily be worth $150-250m/year in revenue to the U.S. government, based on the cost of the Advanced EHF and other wideband military satellites. The yearly cost to support this is $1-2m dollars, thus my first infrastructure payload for mining is already generating strongly positive cash flow.
XML is like violence. If it doesn't solve your problem, you're not using enough of it. --AC
Actually, lasers travel through space a lot better than through our thick atmosphere. Moving air, temperature changes, and water vapor all disrupt lasers much more than radio waves. It's only good in short distances or space.
so that we can get laser com from multiple sources. Then simply beam down to earth. I would guess that 10 or more would be needed, but this is cheaper than all of the ground stations that we have set up.
I prefer the "u" in honour as it seems to be missing these days.
Actually, that has little to do with our military spending. The fact is, that we spend a great deal less than Russia and China on a % GDP basis. Our problem is that we are not taxing enough and reagan, Poppa Bush, W, and Obama have ran up a massive debt.
I prefer the "u" in honour as it seems to be missing these days.
...don't look at the moon with your remaining eye.
Mastering the English language is fucking easy: all you have to do is to put an f* word in every fucking sentence.
This is the phase where we put a giant "laser" on the Moon. As you know, the Moon rotates around the Earth like so *spins moon globe around earth globe*. When the Moon reaches it's appropriate Lunar alignment, it will destroy Washington DC. You see, I've turned the Moon into what I like to call a "Death Star". Anyway, the key to this is the giant laser. It was invented by the noted Cambridge physicist Dr. Parsons. Therefore we shall call it The Alan Parsons Project
The space faring equivalent of sticks and stones.
We already have laser reflectors on the moon. Left by Apollo 13 or so I believe.
It is regularly used for distance measuring.
It is not really hard to point one laser to lunar and another one from there to earth. A data link is absolutely trivial. Hint: a laser beam going to the moon is widening to roughly 100km diameter. Not hard at all to hold the aim.
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.
We have massive debt because we keep cutting taxes while increasing spending. The majority of the debt Obama put on the books is the iraq war, and a couple of tax cuts used to stimulate the ecomomy.
The problem is we cut taxes, and the economy still wasn't stimulated to grow, so we did it again and again.
Also GDP has no bearing on government spending. the GDP is to government spending as the dow jones index is to your personal wealth. The two only line up very very rarely.
i thought once I was found, but it was only a dream.
This may seem out of left field, but I was recently pondering the efficacy of lasers for submarine communications.
Only the very lowest radio frequencies penetrate a short distance below the surface of the ocean. The broadcasting equipment for those are enormous multi-megawatt monsters which can only transmit a minuscule amount of data, amounting to maybe a sentence per hour.
But with certain wavelengths of lasers, you can get penetration up to ~115 meters.
http://www.laseroptronix.se/techinfo/Waterabsorption.pdf
Even if the range is less, I'm sure submarine fleets would appreciate the option of laser-based two-way communications with satellites, without needing to surface.
Other than strategically placed buoys, is there even any other option for modernizing submarine communications past our current circa 1960s methods?
Slashdot gets worse every day... Pipedot: News for nerds, without the corporate slant
we have been bouncing a laser off the moon since the late 60's
And receiving back only a few photons out of billions, making any meaningful data transfer impossible, unless you consider 1 bps meaningful.
can we please for the love of god end the multimillion dollar experiments that a 12 year old does on instructables?
Can we please educate people enough so that they understand that shining a light across a room is much easier than detecting it from 250,000 mies away?
Um, Apollo 13 never made it to the Moon.
Apollo 13 article on Wikipedia
In space though, it is the best there is for now.
Help stamp out iliturcy.
The problem is keeping the promises to spend that our parents and grandparents made. Unfortunately, breaking the promises is also bad.
Help stamp out iliturcy.
Time for the exegisis.
"SO we bide our time, waiting for a purer kick to bloom and the future is still bleak, uncertain and beautiful" -GSYBE
Really ?:
https://www.cia.gov/library/publications/the-world-factbook/rankorder/2034rank.html?countryname=United%20States&countrycode=us®ionCode=noa&rank=19#us
New things are always on the horizon
True, forgot about that. the first one was set by Apollo 11, the next two by Apollo 14.
http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.
There are a few reasons it's being done with ground stations right now. This current project we're discussing is a "Demonstration", meaning that the technology has to be proven over several missions, and this is only the first. It's freaking hard to hit a 40 cm spot on the earth, not to mention a 10 cm telescope on a satellite orbiting the moon. My guess is they'll do a TDRS style constellation of satellites when the tech is proven (which I think it will be)
It will be connected to the internet. So i will be anything but Utterly secure.
If information wants to be free, why does my internet connection cost so much?