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Questions tagged [galileo]

Questions pertaining the mission of the Galileo probe studying Jupiter and its moons between 1995 and 2003.

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6 votes
1 answer
71 views

What does "Common frequency offset" plot means in gnss raw measurements?

I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
allexj's user avatar
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2 votes
2 answers
975 views

How to calculate the ECEF coordinates of a satellite given its elevation and azimuth angle, plus the coordinates of a reference object on Earth

So I am looking for a way to 'reverse engineer' satellite ECEF coordinates given its angles of elevation and azimuth and given the coordinates of an object on Earth serving as a reference ground. The ...
Akhaim's user avatar
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7 votes
2 answers
1k views

How is the ambiguity in code phase resolved in GNSS code-based positioning?

For positioning using GNSS, a typical introduction text (example PDF) introduces the concept of pseudo ranges as roughly being the time between transmission of a GNSS signal by the satellite $s$ and ...
Ludo's user avatar
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3 votes
1 answer
52 views

generated error terms for positioning based on a pre defined target accuracy level

I would like to ask a question about accuracy level and precise point positioning or PPP. I'd like to design a system such that when the desired accuracy level is provided as an input, the ...
user42663's user avatar
2 votes
0 answers
109 views

Where can I find the specific details of a gravity assist space mission?

0 I am writing a research essay where I need to know the specific details of a gravity assist mission such as Voyager 2's flyby of Jupiter for example (but any mission would work as long as it is a ...
Alexander Ivanov's user avatar
2 votes
3 answers
983 views

Why didn't the Galileo spacecraft take an image in Jupiter's upper atmosphere?

When the Galileo probe was crashed into Jupiter it could have made an image from what is considered the "surface" (level of Earth-like atmospheric pressure) of Jupiter or the atmosphere more below or ...
user avatar
6 votes
1 answer
293 views

Why did the Ulysses probe reach Jupiter much faster than Galileo?

Both Ulysses and Galileo were launched by the Space Shuttle and the Inertial Upper Stage (IUS). Yet Ulysses only took 16 months to reach Jupiter, while Galileo took 6 years. Is it because Galileo ...
Matthew Lee's user avatar
8 votes
1 answer
145 views

Galileo Probe Altitude Data

I was reading about the Galileo Probe, but suddenly my imagination struck an obstacle. The probe was slowed from its arrival speed of about 47 kilometers per second to subsonic speed in less than ...
BMF's user avatar
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6 votes
1 answer
752 views

Why did Cassini have reaction wheels but Galileo, Juno and New Horizons don't?

Three gas giant planet orbiters are mentioned in this answer: Cassini - Uses Reaction Wheels and thrusters Galileo - Primarily managed via spinning the spacecraft and thrusters. Juno - Just ...
uhoh's user avatar
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1 vote
1 answer
94 views

Why was the central obstruction in Galileo's Solid State Imager (SSI) so large? Was the secondary mirror flat?

According to Wikipedia's Galileo Solid State Imager (SSI) The SSI was an 800-by-800-pixel solid state camera consisting of an array of silicon sensors called a charge-coupled device (CCD). Galileo ...
uhoh's user avatar
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20 votes
2 answers
2k views

After the loss of Challenger, why weren’t Galileo and Ulysses launched by Centaurs on expendable boosters?

The Centaur upper stage, the first hydrolox rocket stage ever flown and (in its highly-evolved forms) still one of the most-used, as well as one of the highest-performance (if not the highest-...
Vikki's user avatar
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13 votes
1 answer
4k views

Is there any real time GALILEO coverage map?

GLONASS has this neat live coverage map of earth: Brief explanation: The scale is the fraction of the current day when the 3D dilution of precision or PDOP is ≤ 6. Per this comment if the best ...
Antzi's user avatar
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4 votes
1 answer
987 views

Why are orbital periods different for different GNSS positioning system constellations?

My question is restricted to global positioning systems (Regional ones have geosynchronous constraints, which limits drastically the orbit choice) The diagram in this question highlights different ...
Manu H's user avatar
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7 votes
6 answers
4k views

Do electronics and mechanical components work in a vacuum or require a sealed controlled atmosphere?

I'm curious about the electronics and other instruments on Voyager and similar spacecraft. Are the electronic components kept in open vacuum or in a sealed atmosphere? I imagine cooling gets tricky ...
Roger Wood's user avatar
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6 votes
2 answers
462 views

If Juno will experience lower levels of radiation than Galileo did why it will fail so much faster?

In the section about Orbit and Environment the Wikipedia article about the Juno spacecraft says: In comparison, Juno will receive much lower levels of radiation than the Galileo orbiter at its ...
uhoh's user avatar
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46 votes
3 answers
10k views

Did the Galileo spacecraft cause a "blotch" on Jupiter after it crashed?

There's this interesting story: Did NASA Accidentally “Nuke” Jupiter? Long story short: On September 21, 2003 Galileo is deorbited in order to prevent eventuality of contamination of Europa. It ...
SF.'s user avatar
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