Questions tagged [deep-space-network]

Deep Space Network is a series of communication antennas around the world used for communication with deep space spacecraft.

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1answer
149 views

Can ESA control the two Voyager spacecraft?

This is such a dumb question. There are many space organizations. Let's take ESA for this case. Given the two Voyager spacecraft are transmitting a weak radio signal to the Earth, can ESA command and ...
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Why is the Deep Space Network now testing an asteroid redirection mission that hasn't launched yet?

The Double Asteroid Redirection Test is a planned demonstration of the ability of a spacecraft to impact into and redirect the path of an asteroid. The test is part of plans to develop a system to ...
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Tradeoffs between using two 34 m and one 70 m Deep Space Network dish?

Discussion at this answer to Why does DSN sometimes uses two dishes at the same time to receive Voyager-1? include the possibility that in some cases it would be preferable to use two 34 meter DSN ...
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Why does DSN sometimes uses two dishes at the same time to receive Voyager-1?

I just looked at the Deep Space Network site DSN Now at https://eyes.nasa.gov/dsn/dsn.html and I saw that both dish numbers 25 and 26 are receiving a 8.42 GHz downlink signal from Voyager 1. Both ...
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What is a Beam Waveguide dish and why do deep space communications stations use them?

NASA Spaceflight.com's Deep Space Network upgrades and new antennas increase vital communication capabilities says: NASA’s Deep Space Network, commonly referred to as the DSN, has welcomed a new dish,...
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Effective bandwidth for Mars rovers to Earth

I'm interested in what the effective bandwidth is for, in particular, the Curiosity and Perseverance rovers back to Earth. By 'effective' I mean 'averaged over a sufficiently long period', so at least ...
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How hard is it to receive direct signals from vehicles on the surface of Mars, and has anyone other than the DSN done so?

Almost all communication from vehicles on the surface of Mars is relayed by spacecraft in orbit around Mars. However vehicles on the surface do communicate directly with Earth. This communication, ...
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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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How can the data rate be increased in noisy outer space?

What can we do to improve the data rate in outer space? I see that there are some noise sources that affect the signal quality between ground stations & deep space. As I've read so far in various ...
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What are monostatic radar observations, and how will Deep Space Network's DSS-13 be used to observe asteroid 1999 WK4's flyby of Earth?

NASA JPL page https://echo.jpl.nasa.gov/asteroids/1999KW4/1999KW4_planning.2019.html says of the radar observations during the close approach of asteroid 1994 KW4 (in part): Update on 2019 May 22: A ...
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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 ...
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Has Same Beam Interference (SBI) been used or at least tested at Mars? Are there plans to use it in the next few years?

Section 5.4 of Descanso I, Radiometric Tracking Techniques for Deep-Space Navigation by Catherine L. Thornton and James S. Border titled Future directions in Radiometric Tracking; Same Beam ...
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Was Dart antenna tested using a DSN antenna located in Australia?

So recently a tweet by a bot which tracks communications by the Deep Space Network stated that: DSS 43 receiving data from Double Asteroid Redirection Test at 312.5kb/s. IN LOCK IN LOCK 1 TURBO 11:11 ...
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How does a third DSN station serves as a “relay” to tie-together observations by two other stations doing VLBI?

Section 2.1 of the DESCANSO document 211 Wideband Very-Long Baseline Interferometry (from here, found here) says: The precision of a VLBI measurement improves with the length of the baseline. The ...
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How will the closure of the Arecibo dish impact deep space communications?

Earlier today, the U.S. National Science Foundation announced that it is decommissioning the Arecibo radio telescope. The 305 meter dish is famous for the 1974 message for extra-terrestrial ...
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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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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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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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If the ESA has its own deep space network, why does it use NASA's?

The European Space Agency has its own network for communicating for spacecraft in deep space, ESTRACK. It has stations distributed around the globe: Nonetheless, several ESA missions use NASA's Deep ...
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Why is the operating temperature for the Voyagers' receiver noise calculation about 1550K?

In line 10 of Table 5.2 of DESCANSO IV - Voyager Telecommunications it shows a value of the uplink receiver noise spectral density of -166.7 dBm/Hz, which is 196.7 dBW/Hz which is 2.1E-20 Watts/Hz = $...
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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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Is it common for the Deep Space Network to contact a TDRS satellite?

As I write this, one of the Madrid dishes of the Deep Space Network is in contact with TDRS satellite #13. I've never seen DSN contact a TDRS satellite before. I thought that system has its own ...
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How many solar system bodies have had coherent radio transponders?

A transponder amplifies, (often) frequency-shifts, and rebroadcasts a received signal. Old-style telephone and TV distribution satellites in GEO used simple transponders to rebroadcast the uplinked ...
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How high is the first Deep Space Atomic Clock orbiting? Does it receive radiation equivalent to that in deep space?

The Livescience article NASA's Tiny New Atomic Clock Could Let Spacecraft Drive Themselves in Deep Space says: But the radiation still changes the way the electronics operate. And those changes ...
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Autonomous Navigation for deep space missions

Autonomous navigation started in early phases of deep space exploration as a provision to achieve accuracy for planet/natural satellite targeting and approach, where radio tracking accuracies were low,...
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How are the velocity and range of a spacecraft measured from ground based stations?

How are the velocity and range of a spacecraft measured from ground based stations? For example we can go on NASA's website and look at the real time data for the mission status of their past ...
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In terms of satellite networks What exactly are RTSWnet/AFSCN and CDAS (NEN, DSN as needed)? Are they like TDRS but for strictly military data?

Question: In terms of satellite networks What exactly are RTSWnet/AFSCN and CDAS (NEN, DSN as needed)? Are they like TDRS but for strictly military data? BACKGROUND: In this answer to Why Are EPIC/...
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Exchange diameter for power in parabolic antenna

If I want to reduce the diameter of a satellite dish, how much power should I add to the transmitter? how is this formula? As I have already been informed a little in this other question I asked: X-...
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How is long-distance optical communications coming along in space?

I remember there was a test of optical communication and some data transfer from lunar orbit to earth, and I think the ISS uploaded (or downloaded-up? which is correct here?) a movie from earth. In ...
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How can the download speed increase from space probes?

It always seems to be a genuine question that is How can we download data from far away probes in instant. When New Horizons reached Ultima Thule, it took us quite a few months to have a great picture ...
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What are the main sources of radio noise & interference limiting deep space data rates and availability?

Let's call "radio" anything electromagnetic below 300 GHz (1 millimeter), unless there is a compelling reason to do otherwise. The question How well can Voyager 1 separate Earth signals from Solar ...
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Will CHEOPS use DSN or ESA ground stations, or both?

The new ESA video Cheops: Europe's exoplanet mission shows an animation of the space telescope communicating with a ground station somewhere in central Spain. The Deep Space Network indeed has a ...
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Did New Horizons use its smaller medium-gain antenna for most/all downlinking of Pluto and Arrokoth flyby data?

Brian May's New Horizons video (below) was released at about the same time that the New Horizons spacecraft passed 2014 MU69 Arrokoth and includes a lot of technically meaningful graphics. One item ...
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What exactly is the interaction that blocked Juno's data downlink near solar conjunction?

According to Space.com's article Juno Phones Home: Jupiter Probe Reconnects with Earth After 8th Flyby, Juno's recent close flyby of Jupiter and data collection happened while Jupiter was too close to ...
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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 ...
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What are the operating systems and network stack in the Chandrayaan - 2 vehicles?

I am trying to find the information about the operating systems that are run in all of the Chandrayaan - 2 vehicles, the orbiter, lander and Rover. Are these just firmwares? Or how are different ...
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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 ...
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Is delay-doppler radar imaging of NEO asteroids possible only if it spins fast enough?

Emily Lakdawalla's blog on the Planetary Society's page explains some of the basic principles in the delay-doppler radar imaging of asteroids, and other astronomical bodies by extension. Radar from a ...
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Why does NASA use higher frequencies even though they have worse Free Space Path Loss (FSPL)?

Looking at the Formula for FSPL we see that it increases with Frequency. Why is X-Band used for Deep Space Communications instead of lower bands like S-Band? Is it a question of data-rates? Is the ...
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Deep Space Network's transmitter power versus frequency?

Just a general question: In regards to the Deep Space Network antennas, how does power from the transmitter of the antenna relate to the frequency used? I believe the antennas use X band frequency for ...
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How does Deep Space Network's DSS-14 transmit radar and receive it at (almost) the same time? (monostatic radar)

@Hobbes' concise yet thorough answer to the question What are monostatic radar observations, and how will Deep Space Network's DSS-13 be used to observe asteroid 1999 WK4's flyby of Earth? tells us ...
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How did NASA's Deep Space Network encode and broadcast music to Opportunity?

@Ingolifs's answer to the question What was the last message to Opportunity today (13 Feb '19)? quotes ArsTechnica's Opportunity did not answer NASA’s final call, and it’s now lost to us: Late ...
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Does a deep space network benefit by having a diversity of latitudes?

When placing ground stations for a deep space communications network, there is a well-established benefit to spreading out the stations by longitude. In particular, having at least three stations ...
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How often has weather interfered with the Deep Space Network?

This answer provides some information about the potential that precipitation can interfere with signals of the Deep Space Network. In practice, how often (a count, ratio or percent) has weather ...
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Deep Space Network implementation?

I am interested in understanding the Deep Space Network (DSN), mainly from a network perspective and how it handles the challenges of high latency communication. On Earth, for example we can use ...
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What is the numbering system used for the DSN dishes?

The title "What is the numbering system used for the DSN dishes?" pretty much sums it up. DSN dishes are referenced by seemingly arbitrary numbers: 14, 55, 36, etc... Do these numbers carry any ...
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5answers
863 views

Why doesn't thermal radio emission from a DSN “hot dish” completely swamp the benefits of a cold LNA?

The 70 meter DSN dishes are often used to receive the weakest signals, and so their receiver LNAs have cryogenic front-ends in an assembly that also contains a LHe refrigerator and vacuum system. If I ...
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What was happening with the DSN/ Cassini?

I decided that I wanted to see DSN receive the last bits of data from DSN Now. The last data was supposed to be received at about 7:55. The signal seemed to continue strong until about 10 minutes ...
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What is considered a good SNR for satellites?

When performing a link budget for satellite communications, a key component is defining an acceptable signal-to-noise-ratio in order to obtain the necessary bit-rate. How does one determine what the ...
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If a MarCO-type CubeSat were in orbit around Bennu, what kind of power would it need to communicate with the Deep Space Network?

This is a follow-up question to: What is the lowest power signal that the DSN can detect? Essentially, I have determined that the asteroid Bennu (ranging from 25 to 350 million kilometers from Earth) ...