Questions tagged [communication]

Questions regarding information transfer between spacecraft, and between spacecraft and Earth.

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7
votes
1answer
410 views

How much power loss does the LLCD suffer in transit?

Space.com writes to say (freeform improved quote): The LLCD (Lunar Laser Communication Demonstration) space terminal is designed to beam data from the moon at a rate six times faster than the best ...
9
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3answers
399 views

Does man send any signal to attract aliens?

Does man send any signal (such as electromagnetic radiation) to space to attract aliens?
13
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1answer
1k views

Decoding Russian ISS telemetry

While the American segment of the ISS has data published on-line (http://spacestationlive.nasa.gov), the same cannot be said about the Russian segment. It is known that telemetry is transmitted to ...
4
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0answers
67 views

What communication protocols are used with latencies going into hours? [duplicate]

What communication protocols are used to communicate with probes that are many light minutes or even hours away? Not only the signal will be weak and badly damaged by background noise, we can't just ...
9
votes
1answer
417 views

Did Curiosity rover communicate to the ground station during its descent phase?

During descent phase and entering Mars' atmosphere, was the rover's descent controlled by the Earth based ground station, or by the rover itself? What are the technical challenges, when communicating ...
6
votes
2answers
2k views

What frequency wavebands are used for communication in LEO?

What are the most commonly used wave bands for communications between satellites in LEO and ground station, and what is the minimum frequency used?
7
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2answers
2k views

Do all satellites and space probes have high & low gain antennas and what are their functions?

What is the main function of high and low gain antennas? Do all satellites and space probes have high and low gain antennas?
12
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1answer
1k views

How is data transferred from interplanetary missions?

I'm trying to find out information about the mechanics of data transmission from planetary probes: techniques, devices, methods, software. In short, How reliable data transmission is undertaken in ...
37
votes
1answer
75k views

How does Voyager 1 send signals to Earth?

I recently studied that Voyager 1 has traveled a distance of 125.01 AU as of August 3rd, 2013. I wonder, how would it be able to communicate with the Earth? How much time does it take for the signal ...
14
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3answers
2k views

Cubesats in lunar orbit and beyond - how does communication work?

Somewhere I read that there are serious plans to send a cubesat into lunar orbit. A few years ago, the ISS was also offering a launch opportunity for such a mission. I guess that it was actually ...
10
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6answers
692 views

Alternative data transfer channels for inter-stellar probes?

The problem how it is possible to receive data from Voyager I at all is dealt in this question: https://physics.stackexchange.com/questions/13227/how-earth-communicates-with-voyager-i However, there ...
9
votes
1answer
331 views

How to design a spacecraft to cope with redshift?

Redshift occurs whenever an observer moves away from (shifted to the red) or approaches (shifted to the blue; blueshift) an object that emits radiation and the other way around. Traveling towards ...
7
votes
1answer
549 views

Techniques for digital superluminal communication

Considering photons only travel at the speed of light (and cannot travel faster), our main technique of digital communication (at least I believe, but I could be wrong) is off the table. What ...
17
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2answers
2k views

What data compression algorithms have been successfully used in spacecraft?

Scientific spacecraft can generate very large amounts of data. However, both the storage available onboard the spacecraft and the bandwidth available to transmit the data to ground stations are ...
18
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3answers
545 views

VLB interferometry in deep space - does it make sense for communication?

This is something I was thinking about right now when this beta was opened ... perfect! In radio astronomy, there is an technique which is called very long baseline interferometry. The idea is to ...