All Questions
Tagged with artificial-satellitesatellite-constellation
18 questions
6votes
1answer
652views
Round number bias in selecting operating altitude of satellites?
With more and more satellites in orbit and increasing risk of collisions, should satellite owners not select satellite altitudes more diligently or even at "random"? Is there a specific ...
- 409
0votes
2answers
189views
Internet satellite constellation at 5,000km [closed]
Imm really disturbed by the large number of Starlink satellites. I know that they have to be like this to reduce latency. But perhaps a moderate increase in latency is tolerable if it leads to a ...
6votes
1answer
90views
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 ...
- 159
5votes
2answers
969views
What does a "handover" really mean in satellite communications?
I am working on simulating a satellite constellation and I keep coming across the term "handover". My general understanding is that a handover is when a ground station switches its connected ...
1vote
0answers
96views
How to maintain minimum distance between satellites for duration of their orbits
I am working on a simulation in python that involves propagating hundreds of satellites over time. For simplicity, let's assume I have satellites at only a single inclination separated into multiple ...
10votes
2answers
2kviews
Is the full GPS constellation a Walker Delta constellation?
Through the extremely rigorous method of looking at the animation on Wikipedia's article about GPS, if this does indeed accurately represent GPS satellite orbits, then it looks like not all of the ...
- 1,059
1vote
0answers
637views
Starlink CONSTELLATION cycle time? Not the orbit time for a specific sat but the time to be over the same spot twice
STARLINK constellation, how many hours for the constellation to cycle? IOWs if a sat is overhead this instant how long till that same sat is over this same spot. The time for the constellation to ...
3votes
1answer
2kviews
How does one calculate the look angle for non-geo satellites (i.e. LEO, HEO, etc.)
I'm trying to find a way to calculate look angles to not just GEO satellites, but LEO, MEO, and HEO sats. The only calculator I've found myself is here, which was referenced for a similar problem on ...
- 71
3votes
0answers
123views
Where to find the network topology of Iridium-Next?
This is my first post on Space Exploration. I'll preface this by saying that I just started learning how satellite communications work from a technical perspective. Until a few days ago I had never ...
- 131
10votes
1answer
1kviews
Which satellite constellations are already operational in LEO (Low Earth Orbit)?
I am researching information on active and operational constellations in LEO (Low Earth Orbit) but from what I can see, many missions are still only planned (e.g. OneWeb, Amazon) and the only one ...
- 283
3votes
1answer
153views
Could a single CubeSat provide location services on another celestial body such as Mars? Could a constellation do it?
From my understanding, by having two satellites emit a signal simultaneously (carrying atomic clocks to achieve it), a ground device could measure the difference in times of arrival to determine its ...
- 193
1vote
2answers
162views
A dataset for Earth satellite size information?
I am lookin for a dataset where I can find or calculate the size information of an Earth satellite as described in the seconds page of this paper. It is basically the radius of the smallest sphere ...
4votes
0answers
663views
Once Starlink is fully deployed how many satellites will be visible at any given moment?
So the GPS system has 31 satellites in an orbit of 20,180 km. Most of the time there are at least 3-4 satellites 'visible' (visible from a signal reception point of view) at any given moment. The ...
- 697
5votes
1answer
507views
Why can't I just use dot product angles to get satellite vision of a point on Earth?
Right now I'm using MATLAB and can easily get the ECEF coordinates of the satellite and the point on the Earth. Since ECEF is cartesian, why can't I just rearrange: $$ r_{es}\cdot r_{ps} = \|r_{es}\| ...
4votes
0answers
3kviews
How to see Iridium Flares (if possible) in 2020 and beyond?
On December 27th, 2019, Iridium 97 burned up in the atmosphere and there was a "#Flarewell" celebration. However, according to this website which seems to be VERY detailed, there are still 5 ...
- 141
