Multistage Missions

Using GMAT for specific types of missions.

Multistage Missions

Postby mbr4477 » Mon Aug 12, 2013 3:58 pm

I am new to GMAT and am considering using it for a school project. However, I need to simulate multistage spacecraft mission to Mars. I searched the forum and scanned the docs but didn't find anything. Does anyone know a good resource for learning how to do this? Thanks.
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Re: Multistage Missions

Postby jjkparker » Mon Aug 12, 2013 7:34 pm

Can you clarify what you mean by "multistage"? Do you mean a mission with planetary flybys? Or just that you want to simulate the trajectory in stages?

You might take a look at our Optimal Lunar Flyby tutorial. It's pretty complex, but it does show how to set up a multi-phase mission. You'll probably want to start with some of the earlier tutorials, though.

http://gmat.sourceforge.net/docs/R2013a ... rials.html
Joel J. K. Parker
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Re: Multistage Missions

Postby mbr4477 » Tue Aug 13, 2013 2:35 pm

Thanks for the reply. By multistage, I mean multistage spacecraft. My project requires the simulation of releasing three or four smaller spacecraft from the main craft. Is this possible with GMAT? If not, what other simulation software might be better? Thanks again.
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Re: Multistage Missions

Postby jjkparker » Tue Aug 13, 2013 3:44 pm

Ah, I see. Well, one thing you could try is to model each sub-spacecraft as a separate Spacecraft resource in GMAT. There's no specific support for multi-stage spacecraft, but there's nothing preventing you from placing several at the same location, then propagating them independently.

Joel
Joel J. K. Parker
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http://gmatcentral.org
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Re: Multistage Missions

Postby mbr4477 » Tue Aug 13, 2013 11:44 pm

OK, I will look into that. WIll I need to propagate them all from simulation start to finish, or can I wait and start simulating the other spacecraft only when they have been released from the previous one?
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Re: Multistage Missions

Postby jjkparker » Wed Aug 14, 2013 12:33 pm

Yes, you can simulate each spacecraft independently. There's actually no "scenario time" in GMAT; each Spacecraft resource controls its own time.

You might consider placing all spacecraft at the same position/velocity, then imparting maneuvers on all the sub-spacecraft to simulate release. Then you can control each one independently in your mission.
Joel J. K. Parker
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http://gmatcentral.org
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Re: Multistage Missions

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