Questions tagged [communication]

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

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22
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4answers
7k views

Is Quantum Entanglement technology possible for interplanetary communication in future to achieve low real-time latency?

There is a small debate over the comment session in NASA Lands InSight on Mars video uploaded by JPL. The 1 minute and a half video is about the essential part of InSight's EDL event cropped out from ...
16
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3answers
4k views

Could “live” video be transmitted from Mars?

With the approach of InSight to Mars today, and the two cubesats watching it, much is being made about seeing "Live Video" from the cubesats. I'm pretty sure that simply can't happen, but I'm ...
6
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2answers
504 views

Radio Telemetry from Parker Probe?

Given that the Sun emits wide band RF noise at high levels, how is the Parker probe going to transmit its data collection to Earth (Terrestrial) when it reaches its closest proximity to the Sun in ...
16
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2answers
3k views

Were there any CAPCOMs who were not astronauts?

The capsule communicator (CAPCOM) is the person in mission control who speaks to the astronauts. The position was invented by NASA's first flight director, Chris Kraft, who believed it would be best ...
2
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2answers
181 views

Why will radioastronomy telescopes be used to listen to InSight's entry into Mars' atmosphere instead of DSN?

The JPL News article How NASA Will Know When InSight Touches Down is interesting and worth a read. It says that during the atmospheric entry, descent and landing, the Mars InSight probe will be ...
3
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1answer
201 views

Are there plans or a program for an optical relay pathfinder for deep space?

In Glenn Research Center's Richard Reinhart's slides Space Communication and Navigation TestbedCommunications Technology for Exploration for the 2013 ISS Research and Development Conference I saw an ...
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0answers
71 views

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 ...
2
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0answers
456 views

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 ...
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1answer
211 views

Yet another OSIRIS! Has the DLR/GOM Space test of the cubesat optical communications link happened yet?

Speaking of "all things OSIRIS" I just ran across the OSIRIS optical communications system for cubesats and smallsats. OSIRIS (Optical Space Infrared Downlink System) highly compact optical ...
18
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2answers
3k views

Did NASA's Borg Collective-designed antennas work? Have similar designs ever been used in spacecraft beyond testing?

This interesting answer to the question Do antenna farms on spacecraft make any sense or are they purely aesthetic? in Worldbuilding SE links to the NASA Ames page 'Borg' Computer Collective Designs ...
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1answer
73 views

Is it possible to use the planet earth as a giant smoke signal to communicate across space? [closed]

I have had a theory that maybe by placing an object like a large satalite rotating disc a certain distance away from the planet earth. We can rotate the satalite at a reasonable speed to perform ...
2
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1answer
174 views

Given a working satellite, would it be possible to build a homemade transmitter/receiver?

Given existing low-orbit and geo-synchronous satellites, would it be possible to build a device that could send a signal to a satellite and then have that signal received on another device? ...
0
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0answers
495 views

How to calculate azimuth and elevation angles from satellite point of view of a ground station?

How to find azimuth and elevation from satellite of a ground station when yaw, pitch, roll, lat, long position of satellite and lat, long position on ground are given? ...
2
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0answers
173 views

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 ...
5
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2answers
140 views

Can a swarm of nano-probes act as a phased antenna of a greater power?

One problem with nano-satellites and generally any small spacecraft is that you can't fit a powerful power source and antenna - their usability outside vicinity of 'adult' satellites or Earth is thus ...
2
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2answers
140 views

Which Live satellites can the public view of earth? [closed]

Does anybody know if there is a LIVE satellite? Like a cross between Google Earth (zoom) and GOES 16 (LIVE)? So WE can see what's really going on around here? I want to see inside of the crater in ...
3
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3answers
504 views

Has the Curiosity rover ever communicated directly with Earth via its high-gain antenna? Signal strength & data rate?

In the question How does Curiosity know how to point and move it's high gain antenna in real time? I show an image of the hexagonal, articulated high gain antenna on the curiosity rover, as well as ...
5
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1answer
119 views

Do the rovers in Hayabusa-2 communicate directly with the spacecraft or use the landers as relay?

I can't infer this from this documentation or the presentation: Do the ROVER-1A and ROVER-1B communicate with MINERVA-II-1, and it then relays to the Hayabusa2 "mothership", or do they communicate ...
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3answers
488 views

Why were the antennas on the spherical surface of some early satellites spiral-shaped?

In the question What's the spiral pattern on this satellite? I show this image of a spiral-shaped pattern on the spherical surface of a (presumably) vintage satellite or model thereof. @OrganicMarble'...
18
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3answers
5k views

Can we detect the cell phone, satellite phone, or walkie talkie of someone walking on Mars from Earth?

We certainly cannot see a person walking on Mars from Earth. But what if the person is trying to use a cell phone, walkie talkie, or satellite phone? Although he won't have much luck using any of ...
7
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2answers
345 views

Is telerobotic surgery logistically feasible in orbit?

A recent comment said telerobotic surgery might be used in space, a follow up comment said that multiple minute light delays would complicate it. But I wonder if just the fact that being in orbit, ...
5
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1answer
399 views

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 ...
3
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3answers
518 views

What are the prospects for comms with cubesats using “normal” internet connections?

Can a cubesat in orbit be operated like a R/C airplane in real time? edit: if the link here and the end aren't clear, I'm interested in the ease and convenience of access, the frequency of possible ...
3
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1answer
369 views

Why are polar codes not being used in space communications (error correction)?

From what I have read, satellite communications work mostly using turbo codes since the 90s, but most recently (2009) the polar codes were developed, which seem to be also faster and easier to ...
5
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1answer
91 views

Synchronizing spacecraft communication

When NASA is giving commands to a distant spacecraft like Juno, how is that done in terms of timing and protocol? For example do they: give a command to burn for 15 seconds upon receiving the ...
5
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1answer
175 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 ...
3
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1answer
851 views

What will China's new “space station” in Argentinian Patagonia be used for?

The New York Times (fairly strongly worded) article From a Space Station in Argentina, China Expands Its Reach in Latin America describes a "space station" or base equipped with (among other things) a ...
7
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1answer
269 views

Deep Space Network time budgets per spacecraft - is such statistics available?

Is statistics available about time consumed by different spacecraft for communication wint NASA Deep Space Network (DSN)? It would be interesting to compare which space missions are more downlink-...
55
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3answers
15k views

How did NASA prevent third parties from spoofing Apollo communications?

The Apollo crews transmitted footage to Earth using SSTV, a ham radio technique that amateurs and pirates can use to send similar messages around the world. Did NASA have any technical ...
3
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1answer
152 views

What nodes were used to send a NASA selfie from Antarctica to the ISS?

The November 29, 2017 NASA video Future-Proofing the Interplanetary Internet says: In a recent demonstration of the technology, NASA sent a selfie from Antarctica to the space station, making ...
6
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1answer
198 views

Relativistic effects in space mission communications

How important are relativistic effects in communication with space missions? I am doing some work on Mars Pathfinder and want to know if effects like gravitational deflection of microwaves matter in ...
6
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1answer
146 views

Laser communication for interplanetary probes - aiming is impossible without beacon?

Laser communications are considered very promising for interplanetary probes because of potentially much higher data rates. I found that laser communication at large distances (over 3 a.u. ~ 450 ...
2
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1answer
138 views

Data from Cubesat as web API

I’m doing some research for possible cubesat mission and I spent days on the internet and in books trying to find a simple answer to my dumb question. I’m completely new in this field so I’m not sure ...
2
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2answers
147 views

Why is SES-12 "…basically two satellites in one…”?

The Florida Today article On second flight, SpaceX Falcon 9 rocket to launch 'brute' of a satellite from Cape describes the upcoming SpaceX launch of SES-12. At roughly 12,000 pounds, the SES-12 ...
5
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1answer
253 views

Attitude requirements for inter-satellite laser communication

Previous questions have address the beam divergence angles and the expected signal attenuation for laser communication between spacecraft. However, I was wondering what is a typical receiver aperture ...
5
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1answer
550 views

Why is Queqiao's dish antenna so big? (Chang'e-4 relay satellite) Largest ever on/near the Moon?

Source: Chinese language blogpost The NASA Spaceflight article Queqiao relay satellite launched ahead of Chang’e-4 lunar mission describes the communications relay satellite that will be used to ...
4
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2answers
294 views

Why is Sentinel 3B's dish antenna overwrapped with metallized film?

The Spaceflight Now article Photos: Sentinel 3B satellite prepared for launch from Plesetsk Cosmodrome has of course lots of photos. One of them shows a dish antenna covered with shiny, metallized ...
6
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2answers
182 views

Feasibility of Interstellar Probe Communication

So, I understand that to transmit information across interstellar distances, you need to use a lot of power (or less bandwidth?), something for example a small space probe wouldn't exactly have. If we ...
2
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1answer
117 views

Is communication from a spacecraft in SEL1 disturbed by the Sun?

A spacecraft at the Sun Earth Lagrange point one (1% of an AU, or one Solar diameter, from Earth towards the Sun) would have the Sun as its background. Is the Sun emitting strongly enough at ...
2
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2answers
156 views

Stethoscope as a backup communication device

I'm curious about the use of stethoscopes as a backup communication source. This would be used between two spacecrafts, such as 2 astronauts in spacesuits, and help bridge the vacuum between them. ...
6
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3answers
692 views

Is it possible for Curiosity to broadcast live HD television from Mars to Earth?

Current Mars rovers collect large amounts of data and image sequences on Mars and store them in memory, and usually they then transfer the data to a spacecraft in Mars orbit for rebroadcast to Earth ...
3
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1answer
146 views

Was the Orbit Pavilion triggered by real communications events?

The October 2016 NASA JPL news article Art Turns Public Eyes (and Ears) Toward Space describes an artistic interpretation of the communications between a number of NASA Earth satellites and ground ...
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3answers
2k views

Do satellite uplink/downlink signals spread or leak into space?

Satellite communication generally involves three types of nodes: the ground station (also known as teleport), the satellite in geosynchronous orbit, and the satellite receiver/transceiver. I am ...
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0answers
59 views

Was Houston able to control to the Apollo spacecraft if needed? [duplicate]

Was every aspect of a flight, aside from liftoff, solely the responsibility of the crew? Or was Houston able to command parts of the spacecraft and its computers remotely in an emergency or if ...
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2answers
5k views

First call to the moon 1969

During the Apollo 11 mission to the moon, there was a phone call where the POTUS at that time, Richard Nixon, was able to speak to astronauts Neil Armstrong and "Buzz" Aldrin. How was this possible?
6
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2answers
509 views

Frequency and modulation mode(s) for the SpaceX Tesla roadster mass in space

As an Electrical Engineer (emphasis in RF and radar, class of '74) who has followed the space program(s) since Mercury, and a prior flight test telemetry engineer, I was wondering if anyone knows what ...
1
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1answer
769 views

Why would SpaceX limit Starman’s Tesla signal transmission to 12 hours and not use solar power? [duplicate]

I'm as smitten as everyone else by Elon’s Starman cruisin' his Tesla through the cosmos. But I'm even more curious why we were limited to a signal transmission architecture with a mere 12-hour life ...
6
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2answers
1k views

How did the communication work between the SpaceX Tesla and Earth?

With a Tesla launched in space and HD cameras put on it, I can imagine its not easy to receive a signal from that slowly spinning, multiple ten-thousand km away new artificial object in our solar ...
11
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3answers
4k views

Will the Tesla Roadster return any telemetry?

Is there any equipment fitted to the Tesla Roadster to send signals back to Earth, even for a short time after launch?
2
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0answers
94 views

How long is a satellite orbiting at 300 miles going to be visible from horizon to horizon?

Elon Musk has a plan for satellite internet that involves LEO and VLEO satellites. The question I have is how long would a satellite at these altitudes actually be within range before having to ...