Questions tagged [ground-station]

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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 ...
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60 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: ...
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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 ...
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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 ...
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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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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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1answer
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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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0answers
62 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. ...
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1answer
275 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 :...
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1answer
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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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1answer
157 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 ...
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2answers
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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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329 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 ...
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66 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 ...
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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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1answer
695 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 ...
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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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519 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 ...
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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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1answer
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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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1answer
48 views

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 ...
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How much does it cost to operate a satellite in orbit? [closed]

A satellite mission goes through different phases: planning, building, launch, operation. I was wondering what percentage of the whole cost is consumed by the operation and maintenance of a satellite ...
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748 views

Techniques to reduce radio interference or noise

As a member of a pulsar search team that works through the Pulsar Search Collaboratory, I've noticed that many data plots (except the tests) are radio frequency interference (RFI) or noise. As a ...