Questions tagged [communication]

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

Filter by
Sorted by
Tagged with
5
votes
1answer
2k views

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 ...
4
votes
1answer
155 views
+100

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 ...
2
votes
0answers
74 views

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 ...
5
votes
1answer
83 views

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 ...
2
votes
1answer
122 views

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 ...
1
vote
0answers
38 views

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 ...
8
votes
1answer
583 views

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 ...
2
votes
0answers
88 views

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. ...
8
votes
1answer
132 views

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 ...
6
votes
0answers
96 views

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 ...
3
votes
2answers
127 views

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 ...
0
votes
0answers
50 views

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 ...
-2
votes
3answers
158 views

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 ...
1
vote
1answer
43 views

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 ...
3
votes
2answers
80 views

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 ...
1
vote
2answers
147 views

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, ...
3
votes
1answer
155 views

First radio contact between an Australian and a spacecraft? First voice communications?

Launched east from Cape Canaveral at about 30 degrees north latitude, the first few orbits have an opportunity to pass over Australia because it's big and roughly antipodal, especially as the Earth ...
2
votes
1answer
62 views

UHF transceiver for cubesats network

I already asked things related to this topic. But this time I will try to divide it by points to make it more understandable. Features of my cubesats: Would have 8 cubesats 3U in Earth's orbit The ...
3
votes
1answer
86 views

Considerations in producing satellite to smartphone communication

Recently, the company Lynk has been able to conduct direct satellite to smartphone communication. While the article only references the capacity for downlink to the phone, what difficulties must be ...
1
vote
2answers
92 views

X-Band range and data

In summary I am working on a network consisting of 8 cubesat 1U that will be at an orbit altitude of 850Km. The question is that I am working on communications, the idea is that this network of ...
22
votes
1answer
3k views

Why will Canberra be 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 ...
2
votes
1answer
220 views

How does SpaceX transmit the video feed from the first and second stage cameras back to Earth?

There appear to be at least 1 reasonably high-res (500+ px vertical res) live video stream being transmitted from both the SpaceX F9 first and upper stages all the way up into LEO throughout their ...
5
votes
2answers
217 views

Apollo PTC roll orientation and communication with earth

I have a 2 part question. With the Sun, Earth and Moon on the same plane, I do not understand the difference in heat distribution between perpendicular or parallel orientation with reference to the ...
3
votes
1answer
142 views

What “gap” could have caused the Starliner instructions to be delayed?

The Starliner launch didn't go as planned today After being released by the rocket, Starliner was supposed to use its Orbital Maneuvering and Attitude Control engines to provide the thrust needed ...
20
votes
2answers
3k views

How do the Starlink satellites shine?

As we can see the Starlink satellites with the naked eye as they pass by. I was wondering about what makes them visible. Do they have large mirrors that reflect the sunlight making them look as if ...
5
votes
2answers
357 views

Besides the (currently down) HDEV, are there other public live video feeds from the ISS?

I am working on spacecraft simulation software, and I would like to validate my ISS simulation that uses ISS-Mimic's code to connect to live ISS telemetry. I already have some early validation done ...
3
votes
3answers
98 views

Which deep space spacecraft had main dish antennas that were perforated or made from mesh?

A long time ago I was considering asking why the dish antennas on some deep-space probes were perforated metal or mesh (presumably to save weight), while others were solid. I'm trying to finally ...
13
votes
2answers
2k views

What happens differently when ISS is inside this red boundary (Russia & Europe & …)?

The question Why are there advertisements in the Russian ISS flight control room? shows the image below. There is a large red boundary that looks like the boundary of the overlap of several circles ...
11
votes
1answer
2k views

Will Curiosity and the Mars 2020 rover be able to communicate with each other via a Mars orbiter?

Curiosity's UHF antenna on sol 2439 Could Curiosity and the Mars 2020 rover communicate with each other via the MRO orbiter ? And would it have advantages ? (Like: " I just saw a meteorite, and it'...
2
votes
1answer
78 views

Possible interference in RF spectrum due to space-based internet

Multiple Commercial Operators plan to use satellite megaconstellations for providing internet coverage in near future. Is there a possibility of interference between RF spectrum already in use for ...
1
vote
1answer
46 views

Where can I get data on deep space satellites or probes like voyager 1

I am doing a research on deep space communication. I need data on any of the man made deep space probes like voyager 1. I need the probe's transmitter power, received power on earth, Signal to noise ...
7
votes
1answer
177 views

Technical feasibility of a country at least partially preventing use of internet from satellite constellations?

The interesting Politics SE question To what extent can a government control satellite internet compared to internet from a local ISP? asks from the perspective of politics and international law, but ...
7
votes
1answer
209 views

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 ...
1
vote
1answer
42 views

How is the data from the three DSN sites transmitted to JPL, NASA and vice-versa?

We know that there are three major Deep Space Network (DSN) sites on Earth, roughly $120^{\circ}$ apart, to communicate with space probes in deep space continuously. All the data from the three DSN ...
1
vote
0answers
88 views

Two consecutive high profile Moon landings fail, any common threads?

For the second time in a few months, we have seen a Moon landing fail at the last moment as computer communications failed. The Beresheet failure is well addressed here; did a similar thing happen ...
33
votes
2answers
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 ...
3
votes
1answer
96 views

What is/were the Soviet/Russian qualifications for a capsule communicator?

The person in mission control responsible for speaking to American crews is called the capsule communicator or CAPCOM. Historically this person has been another astronaut -- as they would have the ...
3
votes
1answer
248 views

Is contact with Pioneer 7 or 8 still possible?

Pioneer 6 to 9 are a series of scientific probes launched 1965-1968 that orbit the Sun at about 0.75 to 1.2 AU. Would it still be possible to contact Pioneer 7 or 8? This question asks a similar ...
6
votes
1answer
192 views

Why was the Apollo 11 in-flight video better than the moon landing video?

Using the incredible site: https://apolloinrealtime.org/11/ as it replays the entire mission in real-time. One great feature is that the site plays the in-flight TV transmissions that the crew made ...
3
votes
1answer
103 views

Did Australian ground stations cover other Apollo missions' first steps?

It is quite well-publicized that the TV broadcast of Neil Armstrong's first steps on the moon were received by the Honeysuckle Creek tracking station in Australia, because that was the side of the ...
1
vote
2answers
442 views

Chandrayaan-2 orbiter and lander communications with Earth (IDSN)

In the Seeker video India Could Be the First to Land on the Moon’s South Pole a bit after 04:20 the narrator says: Okay, well right about now you’re probably ...
3
votes
3answers
197 views

How large of an antenna would you need to connect to the ISS's WiFi network from Earth?

Supposing I wanted to connect to the ISS's WiFi network from the ground, how large of an antenna would I need to do so, and what kind? Would they need to increase the power on their end or use a ...
12
votes
4answers
4k views

Why aren't space telescopes put in GEO?

I don't know of any space telescope that has been placed in geosynchronous orbit among the communication satellites. I wonder why not? In GEO, a space telescope could use a single stationary radio ...
7
votes
3answers
252 views

What if the Voyagers had remained within the plane of the ecliptic?

On their last big-planet flybys, both Voyager 1 and 2 were given substantial kicks out of the plane of the ecliptic. If this wasn't so, and their flyby's were adjusted to stay within the plane of the ...
1
vote
1answer
132 views

How well would optical fiber work on the Moon or Mars?

Optical fiber used for data transmission over long distances is usually made from ultra-pure SiO2 and carefully doped with germanium in the core to elevate index of refraction. Fiber amplifiers ...
1
vote
1answer
98 views

Long, low mass data transfer wire options

does anyone have any suggestions for wired communications over long distances on the Lunar surface? The maximum length would need to be around 1km. Distributors like Gore and Axon make great ...
0
votes
1answer
113 views

Why did NASA need to attach smartphones to the SPHERES robots in order to link them to the ground?

This May 2016 NASA Johnson video Space Station Live: Getting the Buzz on Astrobee is described as: NASA Commentator Lori Meggs at the Marshall Space Flight Center talks to NASA Ames Research Center’...
8
votes
1answer
377 views

How long could we communicate with Voyager 1/2 if power wasn't a problem

We will be losing contact with Voyager 1 and 2 in a few years due to the decreasing power output from their RTGs. But if I could wave a magic wand so that the RTGs would maintain their current power ...
2
votes
2answers
179 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 ...
2
votes
1answer
55 views

What channel does a launch vehicle telemetry system see? Is it AWGN?

What is the kind of channel seen by a communication system (for telemetry data) on-board a launcher during various phases of launch. Is it a fading channel or AWGN channel? (Additive white Gaussian ...

1
2 3 4 5 6