Questions tagged [satellite-constellation]
A network of satellites carrying out a specific mission or serving a targeted purpose based on an increased area of cover or relative position differences.
85
questions
4
votes
1
answer
1k
views
Does it make sense to use a skyhook to launch and deorbit mega-satellite constellations now?
One issue with sky hooks is that to keep them spinning, they need to accelerate and decelerate the same amount of mass; otherwise, they would change their velocity and might even slow down so much ...
- 5,884
0
votes
1
answer
133
views
Starlink Satellites launching by SpaceX
Starlink Satellites launching by SpaceX
Starlink Satellite Launching news 1
Starlink Satellite launching news 2
Theoretically and practically, how many maximum Starlink Satellites can be launched by ...
- 369
1
vote
2
answers
201
views
Is interstellar communications by transit ray blocking ("Dark Star") novel, plausible?
My son (15) invented what seems me to be a new form of inter-stellar communications, that we've dubbed "Dark Star". The idea is to deploy a swarm of small (perhaps a bit larger than nano, ...
- 119
0
votes
2
answers
161
views
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 ...
6
votes
1
answer
73
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 ...
- 59
4
votes
1
answer
153
views
Could mirrors used in a Dyson Swarm be made from asteroids in the inner asteroid belt?
In this video from Kurzgesagt they said that one would need to disassemble a whole planet to build a Dyson swarm around the sun.
The video went on about mining Mercury and using the materials ...
- 5,884
5
votes
2
answers
692
views
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 ...
1
vote
0
answers
83
views
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 ...
5
votes
2
answers
192
views
Is there an authoritative source for which GNSS satellite transmits which signals?
I'm trying to algorithmically predict which signals from which GNSS satellites could be heard by a ground-based receiver (without actually looking at the recieved data; the idea is to be able to also ...
- 151
1
vote
1
answer
303
views
LEO Satellite Service / Coverage Time Calculation for a Ground User
I want to determine the time interval during which a ground user is in the coverage of a particular LEO satellite. I only have knowledge of the user's geographical location and the satellite's TLE (...
- 43
10
votes
1
answer
4k
views
Does SpaceX expect 1 collision involving one of their Starlink satellites every 2 years?
I read on https://gizmodo.com/spacex-starlink-satellites-dodge-137-objects-daily-1850616506
by Passant Rabie:
A new report revealed that Starlink satellites had to make 25,000 collision avoidance ...
- 1,164
10
votes
2
answers
2k
views
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 ...
- 1,049
1
vote
1
answer
660
views
Where can I find ephemeris data (up to date) for any of LEO satellites?
A bunch of websites have live tracking of satellites, e.g. this one. Where are they getting the satellite ephemerides data for all of the iridium satellites?
- 349
6
votes
1
answer
373
views
Sentinel-2C and frequency of acquisition
Sentinel-2C, the third Sentinel-2 satellite of the Copernicus program, is planned to be launched in 2024.
Currently, the Copernicus SENTINEL-2 mission "comprises a constellation of two polar-...
- 163
0
votes
0
answers
295
views
Negative elevation angle
What does it mean to have negative values of elevation angle from the low-Earth orbiting (LEO) satellite? Can the negative values of elevation angle be useful?
- 51