# Questions tagged [ground-station]

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23 questions
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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 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 ...
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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 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. ...
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### 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 :...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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MESSAGE FORMATTING Ground station networks exist that invite registered satellite clients to utilize their provided fee based download and ...
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### Where are earth stations typically located?

What type of ground characteristics make it suitable for a satellite ground station?
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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, ...
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### 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 ...
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### How do Russia, China, Japan, and India track their spacecraft?

NASA and the ESA have Deep Space Networks that circle the globe enabling them to track their spacecraft constantly. However, Russia, China, India, and possibly also Japan, only list tracking stations ...
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### Conversion of satellite position coordinates to local horizon reference frame (lat & long)

I'm currently working on a bit of code to calculate satellite passes for a ground station. I've found a variety of references that discuss the conversion form other coordinate reference frames to the ...
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### Diurnal Signature of Earth in Angular state tracking

'Diurnal signature of the earth related to the the rotation of the earth is utilized and 24 hours of amplitude and phase data is used along with Ranging and Doppler shift data to calculate Angular ...
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### Why did ISRO require additional tracking ships in the South Pacific for its MOM mission?

ISRO (Indian Space Research Organisation) so far never before used additional marine vessels to help track their launch vehicles, as an extension to the Indian Deep Space Network (IDSN). So why did it ...