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Questions tagged [communication]

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

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From whence (what ground stations) do all the world's 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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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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How many ways of communication with ground can ISS crew use?

I'm currently writing fictional story which is happening at ISS and I have so many questions about this topic, but this one is the most important to me. How many possibilities of communication they ...
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Frequency progressive signals vs time progressive signals?

I am not very experienced with signals, but something that has occurred to me while reading on various ways we are searching for ET signals, is that it seems most people rule out a signal unless it's ...
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Frequency responses of Voyager's S-band high gain antenna's feed-horn and receiver front end & IF?

I'm working on this question. This is the farthest (known) communications link humans have ever engineered - an one node is running in deep space on 40 year old technology. Pretty amazing! In the ...
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All Optical Global Network - how does the space-to-ground link avoid clouds?

I just saw the news item in Lightwave's online website: Laser Light to leverage free-space optics in space for Optical Satellite as a Service. All Optical Hybrid Global Network (or HALO, as laser ...
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What is astronaut Alexander Gerst signaling with this 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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What will MOM do when Earth isn't looking?

A quick follow-up to Is each instrument on ISRO MOM independently in 24x7 contact with Earth? Every 26 months Sol interposes to occult Earth from the gaze of the Warlord. The last time this occurred ...
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“Luckily with no Lunar Module, Tidbinbilla was able to keep tracking with no interruption…” Why is no LM significant?

@PearsonArtPhoto's answer links to the page Apollo 8, 21 – 28 December 1968 by Hamish Lindsay at honeysucklecreek.net. The page describes a problem with one of the dish antennas that needed to be ...
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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 ...
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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 ...
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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 now, have any of the 'gift' transponders been used or at least tested yet by the gift recipient nation? The BBC news item India launches 'invaluable' ...
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How exactly does the live feed from ISS work?

Using my cell phone in a city to download lots of data very fast is common, thanks due to the dense net of base stations close to me (~1 km). But with the space station about 400 km above ground and ...
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Is each instrument on ISRO MOM independently in 24x7 contact with Earth?

The ISRO Mars Orbiter Mission web-site writes to say Mars Orbiter Mission carries five scientific payloads to observe Martian surface, atmosphere and exosphere extending up to 80,000 km for a ...
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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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Which colleges in the US are researching Astrionics/ Space communication systems?

An example is the Space Engineering Research Center at University of Southern California Viterbi School of Engineering. What other colleges in the US are contributing to research on these topics?
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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? ...
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How to determine an available planetary communication window using orbital mechanics?

For class I have an orbit around Mars at an inclination of 63.4 deg and a base site of 55 deg North and was wondering how to work out the communication window, using orbital mechanics. Orbital ...
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What is this NASA Spaceflight article trying to explain?

The NASA Spaceflight article Extended Russian EVA complete – conducts satellite deployments contains a very long discussion about the timing of the CRS-12 launch. Had it missed the "single shot launch ...