Linked Questions

34 votes
2 answers
6k views

What would it take to get a message to another star?

Let's assume that we've somehow detected the existence of an extraterrestrial civilization through "passive" means, such as detecting a suspicious exoplanetary atmospheric signature. We're now hoping ...
kgutwin's user avatar
  • 1,566
8 votes
1 answer
503 views

How far from earth have atomic clocks (or ultra-stable oscillators) been placed and monitored?

The various flavors of GPS satellite constellations use atomic clocks on each satellite. As far as I know, all of the constellations are "shells" of circular MEO orbits in 3 to 6 planes, 20,000 to 25,...
uhoh's user avatar
  • 149k
5 votes
2 answers
822 views

Are relay stations possible between planets?

I recently participated in a hackathon where we were looking at various space-related challenges and one that we considered was communications between Earth and Mars. The hackathon is over now but I ...
Henry's user avatar
  • 311
4 votes
2 answers
466 views

Quantitatively, why will optical communication be better than X-band for deep-space communications?

In a question about communicating with Voyager, an answer asserts: [70 meter dish antennas deployed in space] just isn't done, and it probably won't be, since optical communication is definitely ...
Phil Frost's user avatar
  • 1,033
5 votes
1 answer
410 views

How is the maximum data rate of the Psyche mission's Deep Space Optical Communications (DSOC) system expected to scale with distance?

NASA's Mission Page Deep Space Optical Communications (DSOC) includes the following: Key DSOC technologies developed for the project include: a low-mass spacecraft disturbance isolation and pointing ...
uhoh's user avatar
  • 149k
5 votes
1 answer
302 views

How does an onboard atomic clock help interplanetary navigation?

On 2019 June 22, JPL will launch and test the accuracy of an onboard atomic clock. Its FAQ says that it will improve interplanetary navigation because for the ship to determine its position, instead ...
Camille Goudeseune's user avatar
2 votes
1 answer
246 views

Where would one deploy deep space atomic clocks?

Space.com: NASA IS LAUNCHING A GPS SYSTEM FOR SPACE NASA/JPL news: Five Things to Know about NASA's Deep Space Atomic Clock NASA mission pages clock NASA Deep Space Atomic Clock Fact Sheet The first ...
uhoh's user avatar
  • 149k
4 votes
2 answers
164 views

Help understanding exactly how an atomic clock facilitates “self-driving spacecraft” when paired with an onboard camera?

The TechCrunch article NASA details Deep Space Atomic Clock and other tests launching on SpaceX Falcon Heavy says: Jill Seubert, Deep Space Navigator for NASA, explained that this is the world’s ...
uhoh's user avatar
  • 149k
1 vote
1 answer
470 views

Receiver and transmitter in RF/optic satellite communication: distance vs data rate v2

The first version of this question is here. I have read the article "Optical communications work best over relatively short distances in space." by Toyoshima, M., Leeb, W., Kunimori, H. and ...
Adil.Kolenko's user avatar
2 votes
1 answer
297 views

Will future deep space optical communications "ground stations" actually be in space, or on the ground?

Deep space communications ground stations are on the ground because their transmit and receive electronics alone is bulky and heavy, not to mention their 34 and 70 meter dish antennas! But those ...
uhoh's user avatar
  • 149k
3 votes
1 answer
104 views

How did LADEE and LDRC measure it's distance from Lunar orbit to Earth to 1 centimeter accuracy using optical communications?

The video Donald Cornwell plenary talk: NASA's Optical Communications Program: 2015 and Beyond was presented at SPIE Photonics West 2015. It's a great talk and worth the time. LADEE had [the Laser ...
uhoh's user avatar
  • 149k
2 votes
1 answer
210 views

How high is the first Deep Space Atomic Clock orbiting? Does it receive radiation equivalent to that in deep space?

The Livescience article NASA's Tiny New Atomic Clock Could Let Spacecraft Drive Themselves in Deep Space says: But the radiation still changes the way the electronics operate. And those changes ...
uhoh's user avatar
  • 149k
0 votes
1 answer
160 views

Intercommmunication between crewed space missions in all planets of solar system [closed]

As we know Human Communication taking place between Man in space, Man on Moon, Man on Mars (Future exploration) with Human beings on Earth planet where we are living with the help of control stations ...
Prashant Akerkar's user avatar
1 vote
0 answers
112 views

How is Lucy "making use" of a deep space atomic clock?

The entry for Lucy in Wikipedia's Selection of Discovery Mission 13 and 14; Finalists says: The mission will make use of the Deep Space Atomic Clock.81 81https://www.universetoday.com/122822/...
uhoh's user avatar
  • 149k
3 votes
0 answers
58 views

Radio coherent transponders are the foundation of deep space navigation, have optical analogues been used? If so, the furthest distance measured?

Coherent radio transponders receive a signal from Earth containing specially encoded modulation, amplify it and retransmit it back to Earth. Correlating the received signal with the transmitted signal ...
uhoh's user avatar
  • 149k

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