Questions tagged [communication]

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

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How did Argentina, Namibia, and Pakistan help China monitor and communicate with Chang'e 5?

At the end of The Hill's article Chinese official unveils future moon mission plans including possible lunar base it says: The most recent Chang'e 5 probe was assisted by the European Space Agency, ...
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Starlink vs 5G? [closed]

Who is better in terms of speed and network mainly. I know Starlink is not fully functional but I am considering the case when it will be fully functional.
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GMAT - Locating inter-spacecraft contact instead of spacecraft to ground station

GMAT implements two "event locators" that find eclipse times and line of sight intervals. However, this only lets you analyse data between a ground station and a spacecraft. Is there a way ...
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What technology will SpaceX's StarLink satellites most likely use for sat-to-sat linking?

The question How does SpaceX plan to make money with StarLink Broadband? has got me thinking about how the satellites will link to each other. Wikipedia says it's something greater than 10,000 GHz and ...
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1answer
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How should we point our SpaceX Starlink ground transceiver antennas?

I don't have one of course, but I see that the Starlink ground transceiver antennas are flat but "pointable" to some extent. I assume but don't know for sure that there's at least some kind ...
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Closest distance at which cubesat (or comparable smallsat) has communicated with the Deep Space Network or any large 10+ meter dish? Cis-lunar ever?

Discussion below Will future deep space optical communications "ground stations" actually be in space, or on the ground? has got me wondering about the improbable situation where a giant ...
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Studies that identify the best frequencies for transmitting interstellar messages?

We are searching for extraterrestrial communications from other solar systems, and some consider sending them as well. Are there studies attempting to identify which wavelengths are best suited for ...
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What kind of technology is required for Alpha Centauri communication?

Let's assume we already colonised Alpha Centauri. What kind of technology we need in order to send and receive 1kbps? Radio satellite orbiting the sun? How much power, antenna size and solar panel ...
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Why wasn't there a communication delay when Neil Armstrong landed on the moon? [closed]

My understanding is that there was supposed to be a delay between the communication from the moon to Earth. Why were the communication instantaneous?
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“…extending the Starlink network using longer-range laser comms and relay satellites to reach Mars and Starships in-transit” (Musk & Shotwell)

I have it on good authority that SpaceX's Elon Musk and Gwynne Shotwell: ...have talked about extending the Starlink network using longer-range laser comms and relay satellites to reach Mars and ...
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How many independent demonstrations of optical communications between ground and space have been successful?

As everybody knows, the pioneering work of The Professor and his serendipitous collaborator Gilligan demonstrated the reality of ground to space optical communications back in 1964. In that case ...
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How would you calculate the maximum bandwidth possible in space?

If you'd take Earth and Mars, and at both their closest and furthest position (ignore the Sun being nearly in-between for a moment), what would be the maximum amount of bandwidth possible between ...
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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 ...
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Do antennae on the ISS have to constantly move to maintain data links?

In this question and answer pair I see that the ISS can maintain data links to earth through direct access to ground stations as well as through the TDRSS geostationary satellite network. What kind ...
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What's the current state of Mars orbital infrastructure?

As per this Wikipedia article Mars currently has 6 operational artificial satellites: 2001 Mars Odyssey Mars Express Mars Reconnaissance Orbiter Mars Orbiter Mission Mars Atmosphere and Volatile ...
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What's the current state of Venus orbital infrastructure?

As per this Wikipedia article there have been a total of 5 orbiters successfully deployed to Venus: Venera-15 Venera-16 Magellan Venus Express Akatsuki Of which only the Akatsuki seems to be ...
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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 ...
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Why was Canberra able to listen to Voyager 2 but not talk to it?

The New York Times's When Voyager 2 Calls Home, Earth Soon Won’t Be Able to Answer explains that because Voyager 2's trajectory has taken it way below the ecliptic, of the three 70 meter dishes in the ...
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S-Band transceiver schematics [closed]

I'm working on a cubesat, and I want to communicate in the S-Band, arround 2.4GHz. And I'm searching for schematics of a transceiver example with arround 35 dBm of output power. If any have a .pdf, ....
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What is astronaut Alexander Gerst signaling with this K-shaped hand signal?

In this AP/WISN news item Air leak at International Space Station temporarily plugged by a thumb they show a file photo of German astronaut Alexander Gerst at the Baikonur cosmodrome, making what ...
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Is long range radio communication possible on the lunar surface?

There are such things as moon-bounce communication whereby radio signals are 'bounced' off the lunar surface to a distant location on Earth. This mechanism may be likened to the way a mirror reflects ...
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How does one test Ground Segment communications with, and “downlink” data from a spacecraft that's still on the ground?

NASA News item Ground Segment Testing a Success for NASA’s James Webb Space Telescope says: Testing teams have successfully completed a critical milestone focused on demonstrating that NASA’s James ...
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How will Amazon's constellation differentiate itself from SpaceX's and OneWeb's?

The New York Times' Amazon Satellites Add to Astronomers’ Worries About the Night Sky says: Much of the attention on these strings of satellites has been placed on the prolific launches of SpaceX and ...
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Is there any spacecraft that is ping-able?

I was wondering if there are any spacecraft that is ping-able, not necessarily straight through the internet? It would be a fascinating test to run "ping url/ip" and see the response time to space. ...
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Why don't astronauts email their inventory?

I was looking at the SpaceX Dragon capsule reentry. At some time after wake-up Bob gave a precise account of what was consumed from which bag. So many bottles of water, so many breakfasts, this bag ...
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Does NASA's Deep Space Network sometimes listen to other space agencies' spacecraft “just for the heck of it” or other non-mission related reasons?

This answer mentions: It's well known that other countries routinely spy on each other (i.e. the NSA tapping of Angela Merkel's phone). NASA's Deep Space Network's space-related activities (like ...
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Are NASA (and ESA?) deep space spacecraft now generally able to store and forward messages between themselves?

There are discussions under the current answer to Will Curiosity and the Mars 2020 rover be able to communicate with each other via a Mars orbiter? about the feasibility of MRO receiving a message ...
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How hard would it be to get some comms during reentry?

As I type, a Crew Dragon is out of touch while it reenters. While I see how the plasma around the spaceship would make it very hard to communicate, I'm surprised that it is really impossible. How hard ...
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What would be the most viable way to have constant communication with a Mars base?

I am currently working on a project involving designing a Mars base, and a major factor is establishing constant communication between Earth and the Mars ground base. I am thinking of utilizing laser ...
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206 views

How will the Exomars rover communicate back to Earth?

I see here that the Exomars rover has only two UHF monopole antennas. Two UHF monopole antennas are used to communicate with Mars orbiters, including the Trace Gas Orbiter. Does it mean that it ...
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How, specifically, are ISS audio comm loops “privatized”? For example, in private medical conferences?

The paper International Space Station Medical Operations mentions Private medical conferences (PMCs) are conducted regularly and upon crew request with the ISS crew via private audio and video ...
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What will the X-ray communications (XCOM) transmitter look like?

The NASA news article NASA’s NavCube Could Support an X-ray Communications Demonstration in Space — A NASA First mentions the potential use of X-ray wavelengths for improved range of deep space ...
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How well can Voyager 1 separate Earth signals from Solar noise these days?

This is a follow-up question to this question and this and this answer. UPDATED: see additional information and discussion below. As it continues to move farther from the Sun, the angular separation ...
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Did any of Voyagers' receivers' front ends take advantage of the “cold of space” to lower noise?

Most of the Voyagers' electronics are kept warm by electrical heaters powered by their RTG's, and presumably protected by some amount of insulation from the "cold of space" which means loss of heat ...
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Can I text on my cell phone from the ISS to Earth?

We know from Can we detect the cell phone, satellite phone, or walkie talkie of someone walking on Mars from Earth? that cell phone signals on Mars are potentially observable on Earth. I am not an ...
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From whence (what ground stations) do the world's major space agencies receive signals from their missions?

The ISRO web page Ground Segment says: SRO Telemetry Tracking and Command Network (ISTRAC) will be providing support of the TTC ground stations, communications network between ground stations and ...
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How have the 'gift' transponders on ISRO's GSAT-9 been used by other countries?

edit: It's been seven months. close to two years close to two years and seven months over three years now, have any of the 'gift' transponders been used or at least tested yet by the gift recipient ...
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HDEV Goodbye Video- similar projects planned?

I just found that nice "Goodbye HDEV" video on the Columbus-Eye-Projekt-Webpage. (http://columbuseye.rub.de/) Seems like the HDEV-housing is already burned during re-entry. Does anyone know ...
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Is there a certain plan on how Houston will talk with the Artemis 3 crew?

Artemis 3 is going to land on the Moon's south pole, on the far side of the Moon. Therefore, before launching the crew to the Moon, NASA must put (a) communication satellite(s) either into lunar orbit ...
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Can astronauts on an EVA communicate directly with ground stations?

Can astronauts/cosmonauts performing spacewalks at the International Space Station communicate directly with radio stations on the ground (even if only as a back-up)? Or do they need to relay their ...
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Can an astronaut have a private communication during a spacewalk?

In this NASA page it describes an astronaut remaining in contact during an EVA. While inside these pressurized suits, it's essential that they (the astronauts) remain in constant communication ...
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Prior to putting spacecraft on a trajectory going a significant fraction of the speed of light, would some things need to be tested on Earth?

Except for particle accelerators, I don't think we have made any macro object go anywhere near the speeds planned for spacecraft like the one planned in Project Orion. But would there be something ...
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Are Mars rovers in continuous contact with Earth when in line of sight?

The NASA Perseverance rover Communications page describes the Ultra-High Frequency Antenna, the X-band High-Gain Antenna, and the X-band Low-Gain Antenna but does not mention how often it will be in ...
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Would adding satellites between Earth and Mars improve communications latency?

Would adding satellites along the path from Earth to Mars decrease the amount of time it takes to send and receive messages between them?
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How did omission of command to Huygens lander not get caught by anybody at ESA nor anybody at JPL? Procedures in place to avoid in future?

In this answer to Prior to putting spacecraft on a trajectory going a significant fraction of the speed of light, would some things need to be tested on Earth? I wrote: As far as communications is ...
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Would a long-term network of relay satellites but worthwhile for interplanetary communication? [duplicate]

Communication rates with probes in the outer solar systems are extremely low (Voyager is ~160 bps), because of the inverse square law and the extreme distances involved. Achieving these rates ...
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How could we hear back from Breakthrough Starshot? [duplicate]

The Breakthrough Starshot concept is to send a swarm of tiny spacecraft on a flyby mission to Proxima Centauri b. These are tiny spacecraft (on the scale of centimeters). Given how miniscule the ...
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Why not send Voyager 3 and 4 following up the paths taken by Voyager 1 and 2 to re-transmit signals of later as they fly away from Earth?

Voyager 1 and Voyager 2 spacecrafts are on their journey out of solar system. They collected so much of important data that helped us understand our solar system. As these spacecrafts moving out of ...
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Is there a term that references the time delay between two objects communicating in space, especially at great distances?

When communicating at distance in space (such as Earth communicating to a craft orbiting Mars), the communication experiences a time delay. My research indicates this delay maybe called "One-Way Light ...
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Why were two simultaneous command transmissions interpreted by Kosmos 57 as an order to begin the descent?

This answer to Encryption in radio system points to the Wikipedia article Kosmos 57 which says: The unmanned spacecraft was destroyed on its third orbit around Earth. Two ground control stations, ...

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