Questions tagged [sgp4]
The U.S. Space Force's Simplified General Perturbations software, version 4, must be used to correctly interpret the orbit data format known as TLE (Two-Line Elements).
48
questions
0
votes
1
answer
51
views
How would I use SGP4 to simulate the motion of an object in orbit?
Let's assume I wanted to assess the accuracy of SGP4 over time.
I have an archived set of orbital ephemerides taken from SpaceTrack for a non-active object over the last year.
If I picked an epoch say,...
- 564
0
votes
0
answers
24
views
Issue in orbit propagator with wmm2020 output
I am trying to build an orbit propagator with input of latitude and longitude in wmm2020 to plot the magnitude of the geomagnetic field. The orbit seems good but the field plot is completely wrong. ...
0
votes
0
answers
68
views
Conversion of osculating orbital elements to TLE mean elements
I am looking for a method to resample TLE data, so they are regularly sampled. I wanted to use physical propagation to calculate elements at given time. However, the propagation of TLE by SGP4 returns ...
1
vote
0
answers
130
views
How does the Gpredict software algorithm track satellites?
I was wondering how Gpredict calculates the ground tracks, Lat, Long and elevation based on a ground station.
If I understand correctly, Gpredict takes the values from a TLE (Two-Line Element) set, ...
- 63
2
votes
1
answer
484
views
GMAT SGP TLE Propagator and maneuver
So this time I try to use GMAT(2022 ver).
I am using the SPICESGP4 TLE Propagator to simulator ISS's orbit.
For now it work well.
However when I try to use the burn to change its orbit altitude, it ...
- 167
2
votes
1
answer
373
views
In MATLAB, Computing a new TLE/orbit following a delta-v impulse?
I have already worked on this project for a week, and I still can not solve this problem by myself. How can I update data for the SGP4 OrbitPropagator in Matlab's ...
- 167
3
votes
2
answers
262
views
PseudoTLE creation
I am developing a script in python to obtain pseudo TLEs of a satellite, starting from its state vector.
I have always used TLEs to propagate the satellite and predict its next pass over a ground ...
- 31
4
votes
1
answer
115
views
Meaning of superscript letters in sidereal time calculation
I'm following along with Dr Kelso's columns on CelesTrack and I've come across this equation.
$$θ_g(0^h)=24110^s.54841+8640184^s.812866T_u+0^s.093104T_u^2- 6.2\times10^{-6} T_u^3$$
As you can see, ...
- 564
0
votes
0
answers
319
views
TEME to J2000 conversion algorithm
I've asked a few questions to do with this in the last day or so and received answers that have led to more questions...
How to use David Vallado's AstroLib to do reference frame conversions
https:...
- 564
2
votes
0
answers
216
views
How to use David Vallado's AstroLib to do reference frame conversions
Given a Keplerian Orbit description such as that in here:
...
- 564
3
votes
2
answers
161
views
Can I redistribute the SGP4 lib?
I'm writing a C# library to make working with orbits easier.
Given I plan on being able to input data from space-track elsats, which uses TEME SGP4 orbital elements, it's looking increasingly likely ...
- 564
1
vote
0
answers
168
views
Issue with propagating TLE sets using SGP4
I am trying to make some analysis on conjunction events using the TLEs available from Celestrak's SOCRATES page. Take for example the following predicted event:
Here's my issue: when I try to ...
- 21
2
votes
1
answer
191
views
Predicting Satellite Flyover Calculations by Hand
Recently I used transit-finder.com to get a really cool picture of the ISS transiting the sun. The prediction from the website was spot-on. Since then I'm absolutely fascinated by how the prediction ...
- 21
5
votes
2
answers
435
views
How is an input card for SGP4/other astro standards packages crafted?
I've read through the SGP4 documentation at least 5 times, and I swear the only reference it makes to the construction of an input card is "just look at the examples". For Sgp4Prop, it ...
- 93
5
votes
2
answers
3k
views
Track a satellite using python
I tried tracking a satellite - or rather confirming the data I got from the AMSAT pass prediction web page - using python, more precisly the sgp4 and navpy packages.
Now I don't really now what I'm ...
- 51