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Questions tagged [ground-station]

Questions relating to the ground based radio station used for receiving and or sending commands to spacecraft.

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Satellite Navigation: Measuring Velocity & Position

How is the position and velocity of a satellite measured from ground? Radar measurements could give us range and range rate which are scalar quantities (if I understand this correctly). But how could ...
G11's user avatar
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1 vote
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49 views

Definition of "elevation mask" when it comes to sensors and ground stations?

My understanding is that elevation mask is a term for purposely limiting sensor observations, usually on the ground, by intentionally blocking sky observations from the horizon to a specific elevation....
prepont's user avatar
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0 answers
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How does the Gpredict software algorithm track satellites?

I was wondering how Gpredict calculates the ground tracks, Lat, Long and elevation based on a ground station. If I understand correctly, Gpredict takes the values from a TLE (Two-Line Element) set, ...
ed190's user avatar
  • 63
2 votes
1 answer
133 views

Ground station : DVB-S2 TBS-6903 Receiver to communicate with a LEO Satellite

I am working on a project to develop a ground station that communicates with a LEO Satellite in X Band via the DVB-S2 communication standard using off-the-shelf components. It appears that the TBS-...
M.FAKHFAKH's user avatar
4 votes
1 answer
1k views

Can we detect satellite ground station locations?

Is it possible to detect the presence of a satellite ground station in my area? Also can I detect the uplink using a simple Software-Defined Radio (SDR)?
Yossi D's user avatar
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1 answer
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How to get contact locator events in GMAT using Python

I am trying to write a python script for GMAT to detect contacts between a satellite and a ground station. I have declared the contact locator as such: ...
aeroengineer's user avatar
6 votes
1 answer
227 views

What is "ground station lock" and why does it enable faster communication?

I have come across the terms "ground station lock" and "ground station unlock". For example here and here. I guess that is about phase locking with the uplinked signal. I ...
filo's user avatar
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3 votes
1 answer
296 views

Geofence - satellite contact time

I need to find the access/contact times for a satellite passing through a random geofence (polygon). Is there a python library or any code to integrate the geofence to the orbit of the satellite to ...
v_space's user avatar
  • 113
2 votes
1 answer
645 views

How much does it cost to build terrestrial ground station capable of controlling satellites orbiting the moon?

I'm noobie in space exploration and I want to carry out market research to find out how much it costs to build a terrestrial groundstation to control satellite missions that are in lunar orbit. Two ...
Ganimedes's user avatar
  • 163
3 votes
1 answer
70 views

TLE along track error to miss a contact opportunity in UHF

Update: (following @GregMiller's comment): Lets suppose a spacecraft has performed a boost and not all ground stations received the update, lets suppose the difference between the pre and post ...
patowski1981's user avatar
3 votes
1 answer
132 views

The Earth's rotation does change by small amounts; what is done to keep geostationary satellites aligned with ground stations? [duplicate]

Are satellites moved to keep them aligned? Are they at risk of becoming unusable from the small, but measurable changes to Earth's rotation?
Ken Fabian's user avatar
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Seeing the satellite images of the Antarctica and its research stations [closed]

I found a very nice expedition to Antarctica later in Dec and Jan which I plan to onboard. Meanwhile, I would like to see all available satellite photos of all research stations down there, including ...
Heavens's user avatar
1 vote
1 answer
1k views

Are the TLE of a satellite computed with the ECI or ECEF?

I want to compute the distance of a certain satellite, given the TLE, to a ground station in the earth. I have the latitude, longitude and altitude of the ground station. But I don't know if the TLEs ...
DaDSPGuy's user avatar
3 votes
2 answers
221 views

Can we watch the object move towards the Moon and hit it this week at home? Will there be live telescope feeds?

I'm not even going to name the object because there's been some variability and excitement in its identification (DSCOVR 2nd stage, no not DSCOVR, it's Chinese, no not that Chinse rocket body, this ...
uhoh's user avatar
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1 answer
2k views

What kind of signals and encodings were used to send tilt/pan commands to TV cameras on the Moon (up through Apollo)?

This answer to Has anyone in space beyond LEO seen or has anything photographed a non-pointer laser from Earth? shows a frame from video shot by Surveyor 7 on the Moon, looking at Earth, and ...
uhoh's user avatar
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3 votes
0 answers
207 views

Why does this "satellite antenna at the Laguna Peak Tracking and Injection Facility" look so weird? (two dishes back-to-back)

The video 1967 Navy Satellite Navigation training film (IBM 7094 data center) after 11:57 (older version here) the narrator says: For every pound of satellite in ...
uhoh's user avatar
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3 votes
0 answers
267 views

Exact speed/distance of JWST (& others in L1/L2 halo) from Earth; is it measured any differently than for more distant deep-space missions?

How is the exact speed and distance from Earth of the JWST or any spacecraft in a Sun-Earth L1/L2 halo orbit determined? While deep space missions require ranging at hundreds of millions of kilometers ...
Tim's user avatar
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2 votes
1 answer
172 views

What antennas does JAXA use to communicate with its deep space spacecraft? Does it have a deep space network of its own?

@BrendanLuke's answer to Are there currently any spacecraft in orbit around Venus that might (or might not) be at risk of meteoric dust from comet Leonard C/2021 A? alludes to the exciting story of ...
uhoh's user avatar
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3 votes
1 answer
778 views

Who designed the cool-looking Orbita Molniya tracking station at Khabarovsk? What does it look like inside?

Wikipedia's Orbita (TV system) says: Orbita (Russian: орбита) is a Soviet-Russian system of broadcasting and delivering TV signals via satellites. It is considered to be the first national network of ...
uhoh's user avatar
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How exactly did ground stations track the early Molniya satellites?

Wikipedia's Orbita (TV system) says: Orbita (Russian: орбита) is a Soviet-Russian system of broadcasting and delivering TV signals via satellites. It is considered to be the first national network of ...
uhoh's user avatar
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3 votes
1 answer
303 views

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,...
uhoh's user avatar
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2 votes
1 answer
2k views

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 ...
uhoh's user avatar
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1 vote
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101 views

How does China (CASC or CAST) solve Groundsegment?

I was studying Queqiao space mission and I found a lot about how is Tracking, Telemetry and Command or TT&C solved for space component, but not how is secured Space-Ground connectivity - what type ...
Filip Kocián's user avatar
4 votes
1 answer
421 views

Difference between collecting satellite data and tracking its position

When people talk about "tracking" a satellite, do they generally mean receiving data / communication from it, or do they mean determining its position. When an organisation sends a satellite ...
user1551817's user avatar
8 votes
2 answers
2k views

How is satellite position tracked in practice?

How do the increasing number of LEO satellites keep track of their position? I know they use ground stations, but do they employ private companies to keep track for them? It seems like there are way ...
user1551817's user avatar
1 vote
1 answer
232 views

If the Earth spun clockwise, would Florida have still satisfied the requirements for the US launch center in the 1960's?

In a comment under the question If the Earth spun clockwise, how would that affect Space Exploration? I wrote: Kennedy Space Center would be a lot closer to JPL; not sure what all happens with the ...
uhoh's user avatar
  • 149k
3 votes
1 answer
145 views

Does every satellite operator build and operate their own ground station?

I'm thinking especially of small-time operators. Like if a high school team puts a cubesat into space, do they also put an antenna on the school building and just put up with limited accessibility ...
Greg's user avatar
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0 votes
1 answer
76 views

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 ...
uhoh's user avatar
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13 votes
2 answers
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 ...
uhoh's user avatar
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4 votes
1 answer
365 views

Why did Mercury use multiple CAPCOMs while Apollo did not?

A spacecraft needs multiple receiving stations to prevent its radio signals from being blocked by Earth. Wikipedia has a map of the ground stations used for the Mercury missions. The Right Stuff ...
Andrew Breza's user avatar
1 vote
2 answers
304 views

Which map is right? Where exactly were the two Australian dish antennas used in the Apollo missions?

There are two answers to How did NASA achieve their live TV broadcast in 1969? and each has a map that denotes the location of the following two sites Honeysuckle Creek Tracking Station Parkes Radio ...
uhoh's user avatar
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3 votes
1 answer
141 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 ...
DrSheldon's user avatar
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1 vote
1 answer
115 views

What kind of transmitters and antennas do the Lightsail-2 ground stations use?

The cubesat Lightsail-2 has been deployed and has communicated with ground stations. See The Planetary Society's LightSail 2 Healthy as Mission Team Continues Spacecraft Checkouts, where it says: ...
uhoh's user avatar
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1 vote
1 answer
90 views

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 ...
DrSheldon's user avatar
  • 48k
8 votes
1 answer
340 views

"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 ...
uhoh's user avatar
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5 votes
1 answer
553 views

How to determine the optimal orbit for a LEO satellite

Our goal is to determine the best orbit that will allow a ground station (so this is a fixed point on earth) to communicate a maximum number of times par day with a LEO satellite. So the question is :...
Hayfa's user avatar
  • 53
3 votes
1 answer
4k views

How to calculate the angle between the satellite and ground station?

I have the latitude/longitude/altitude of a satellite and a ground station. Also, I have their Cartesian coordinates in Earth-centered-Earth-fixed frame (ECEF). How to calculate the elevation angle ...
Leeloo's user avatar
  • 703
2 votes
1 answer
389 views

How can you calculate the minimal cone angle between two satellites to prevent interference?

I have a model of 2 ground stations (G1 and G2) and 2 LEO satellites (S1 and S2). G1 and G2 are located close to each other. S1 transmits data to G1 and S2 transmits to G2 with almost the same ...
Tarlan Mammadzada's user avatar
4 votes
1 answer
532 views

How does the Satellite Networked Open Ground Station operate? How is it used?

SatNOGS, the Satellite Networked Open Ground Station (mentioned in this answer) appears to be a distribution of independently maintained amateur DIY satellite receiving ground stations, linked by a ...
uhoh's user avatar
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3 votes
0 answers
90 views

What is the Telescope Invariant Point?

I am working on an implementation of an SLR tool. At some points of the documentation of the CRD format the term telescope invariant point shows up. Apparently it's a point on an ILRS antenna system. ...
lenxn's user avatar
  • 163
4 votes
2 answers
2k views

How to design a ground antenna for sending & receiving from a satellite?

Let's suppose there is a wifi router or a cell phone or similar transmitter in an orbit of 3000 km. How could one make a dish antenna to connect and receive the signal from that wifi router or cell ...
Hacker Gamer's user avatar
0 votes
1 answer
76 views

Standardized download message formatting [closed]

MESSAGE FORMATTING Ground station networks exist that invite registered satellite clients to utilize their provided fee based download and ...
Moonbouncer's user avatar
51 votes
1 answer
3k views

How long is the ISS out of reach of all ground stations?

This is a followup to a recent question and answer discussing ground-based monitoring of the International Space Station, specifically in the context of an astronaut crew that is all asleep. How ...
A. Rex's user avatar
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7 votes
1 answer
1k views

Where are earth stations typically located?

What type of ground characteristics make it suitable for a satellite ground station?
bob's user avatar
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0 votes
1 answer
196 views

Does NASA have an Army and Air Force Exchange Service?

Considering the relativity of military at NASA, the question here is "Does NASA have it's own Army and Air Force Exchange Service (AAFES), or does it share with the Department of Defense?" The AAFES ...
user avatar
5 votes
1 answer
103 views

What types of activities are performed when managing a probe in transit?

This question got me thinking - what types of activities are routinely performed when a probe is in a long transit (like Juno, for example)? What does the staffing typically look like? Does one (or a ...
Steve's user avatar
  • 1,174
4 votes
1 answer
1k views

Drawing ground station coverage circles

I'm trying to make a little application to draw ground station coverage circles (before anyone suggests using other software, I enjoy making these kinds of things myself!) I already have code that ...
ThePlanMan's user avatar
  • 4,431
19 votes
1 answer
3k views

Would it be possible to get back to Earth from the ISS without any ground support?

In the TV show Last Man On Earth we follow a small group of immune survivors after an apocalyptic plague has essentially wiped out humanity. It is revealed that a single astronaut on the ISS has also ...
Brian Lynch's user avatar
  • 4,350
5 votes
1 answer
137 views

Range Measurement from Range signal downlink

How is accurate time of round-travel determined from downlinked ranging signal? AFAIK Ranging signal, used to determine distance of a spacecraft is usually a reference wave modulated and uplinked, ...
Kuldeep Barad's user avatar
6 votes
1 answer
740 views

What are the benefits of building an amateur satellite ground station?

Amateur radio hardware is reasonably expensive. Are there any real scientific benefits for universities to build these stations (assuming the don't have a satellite in orbit)? I know there's some ...
ThePlanMan's user avatar
  • 4,431