Questions tagged [trajectory-design]

Trajectory design is the process of designing the trajectory of a space mission so as to fulfill the larger design objectives for that mission.

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6 votes
0 answers
88 views

How do spin-stabilized rockets conduct gravity turns?

I was reading this NTRS document about a spin-stabilized solids-only small launcher. The paper mentions that the proposed design (called 428A) will be spin-stabilized during launch and gravity turn. ...
WarpPrime's user avatar
  • 3,125
4 votes
0 answers
371 views

GMAT: How do I prevent infinite propagation into the future, which causes the "requested epoch 95008.513478505 is not on the DE file" error?

I have a spacecraft I am trying to get from Earth to Mars. I use an Earth propagator until the SC is out of the Earth's sphere of influence, then a deep space propagator until Mars' sphere of ...
Karl Johan's user avatar
3 votes
0 answers
134 views

Porkchop plots/launch windows for Sun-Earth L2 to Mars transfers?

I've been using Earth-Mars launch windows, found with NASA's Trajectory Browser and EasyPorkchop, as launch windows from the Sun-Earth L2 Lagrange point to Mars, with the logic that since the L2 point ...
kardalos's user avatar
  • 339
3 votes
0 answers
215 views

Patched conic approximation targeting retrograde LLO yields prograde orbit

I'm playing around with optimization of a patched conic approximation for a transit from earth orbit to LLO, and when I take the resulting retrograde trajectory and plug it into an integrator, I get a ...
Translunar's user avatar
  • 1,098
2 votes
0 answers
181 views

Escaping Earth - how could one attempt to find the best solution to this trajectory optimization problem in practice?

If there is a satellite in low Earth orbit, with a limited delta-v budget (but high enough to escape Earth) and limited delta-v-rate (thrust), how could one find an acceleration schedule and ...
2080's user avatar
  • 171
2 votes
0 answers
68 views

Manual techniques for trajectory design

I am trying to locate methods of trajectory design that can be performed by hand calculations, specifically for low thrust methods of propulsion like ion thrusters. Can anyone recommend me any ...
Gwyn Davies's user avatar
2 votes
0 answers
54 views

What ways can a University Student get involved in Trajectory Design?

As a physics student (not an engineer) in India, I can't seem to find a lot of opportunities to involve myself in what I find most appealing about what I'm studying in University i.e. astrodynamics. ...
Kartik Tiwari's user avatar
2 votes
0 answers
90 views

What is the importance of thrust control history in low-thrust optimization?

As I have mentioned before, I am trying to optimize an Earth - Mars low-thrust transfer using a particular method. It has been mentioned to me, and I have seen it in many papers, that thrust history ...
Harvey Rael's user avatar
2 votes
2 answers
245 views

How does one design a trajectory involving a lunar and Earth flyby and Lagrange points? What tools are used to calculate the initial guesses?

I'm trying to design a trajectory that takes a spacecraft from Sun-Earth L2 to a lunar flyby, to an Earth flyby and then to Mars (two flybys might be too complex, I might just do one). I've optimized ...
kardalos's user avatar
  • 339
1 vote
0 answers
34 views

How to apply primer vector theory to trajectory optimization under perturbed two-body problem?

I am currently reading the book Primer Vector Theory and Applications by John E. Prussing (https://doi.org/10.1017/CBO9780511778025) to learn primer vector theory. However, all the derivation and ...
Liu's user avatar
  • 61
1 vote
0 answers
64 views

Guidance and control inputs in autonomous satellites

I would like to know which are the standard navigation data available on a small satellite (in LEO). In particular, I'm trying to understand which inputs I should consider for the Guidance&Control ...
Chicca's user avatar
  • 101
1 vote
0 answers
191 views

Installation procedure for NASA's Evolutionary Mission Trajectory Generator (EMTG)?

I am doing trajectory optimization, and want to use NASA's Evolutionary Mission Trajectory Generator (EMTG) software to investigate dates for various trajectories. However, this software does not come ...
kardalos's user avatar
  • 339
1 vote
0 answers
117 views

More advanced alternatives to Trajectory Optimization Tool?

I've been using Arrowstar's Trajectory Optimization Tool to plan interplanetary transfers, and it works well. The next thing I want to do is plan gravity assists from the Sun-Earth L2 Lagrange point ...
kardalos's user avatar
  • 339
1 vote
0 answers
434 views

How do I construct halo orbits around the Sun-Earth L2 point in GMAT? What should the state vector of the spacecraft be?

I am new to trajectory design, and have been using GMAT to learn it since it's free, unlike STK. I have been trying to design a script that takes a spacecraft from Earth orbit to a halo orbit around ...
kardalos's user avatar
  • 339
1 vote
0 answers
329 views

Commercial 3DoF/6DoF trajectory simulation and optimization tool for launch vehicle

Is there any 3DoF/6DoF trajectory simulation and optimization tool for launch vehicles like POST available commercially? If there whether it's how reliable when it comes to using for real-time ...
Astrolien's user avatar
  • 569