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NASA orbit simulation software
Hey..
Does anyone knows what programs does NASA use to simulate and predict the orbit of a spacecraft? and for simulate the reentry phase of the shutle and from now on orion? |
#2
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NASA orbit simulation software
On May 14, 10:39 pm, wrote:
On Thu, 14 May 2009 10:20:18 EDT, in sci.space.tech Joćo Gomes wrote: Hey.. Does anyone knows what programs does NASA use to simulate and predict the orbit of a spacecraft? and for simulate the reentry phase of the shutle and from now on orion? I believe that would be POST2: https://post2.larc.nasa.gov/ Hey, thanks... but this link doesn't work.. can it be because i'm trying to open it from portugal? |
#3
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NASA orbit simulation software
Joćo Gomes wrote:
Hey.. Does anyone knows what programs does NASA use to simulate and predict the orbit of a spacecraft? and for simulate the reentry phase of the shutle and from now on orion? There's no one answer to the first question; every NASA center has its own trajectory analysis software. NASA does use POST quite a bit but it is not the only program used. Regarding the second question, NASA/JSC uses the Descent Design System (DDS) and Spacecraft Trajectory and Mission Planning Simulator (STAMPS) to simulate space shuttle entries. |
#4
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NASA orbit simulation software
On May 16, 3:00 am, wrote:
On Fri, 15 May 2009 07:08:53 EDT, in sci.space.tech Joćo Gomes wrote: On May 14, 10:39 pm, wrote: On Thu, 14 May 2009 10:20:18 EDT, in sci.space.tech Joćo Gomes wrote: Hey.. Does anyone knows what programs does NASA use to simulate and predict the orbit of a spacecraft? and for simulate the reentry phase of the shutle and from now on orion? I believe that would be POST2: https://post2.larc.nasa.gov/ Hey, thanks... but this link doesn't work.. can it be because i'm trying to open it from portugal? Could be. The current program is only available to US govt and contractor s working on govt projects. And is there any cance to get the program? or a similar one? |
#5
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NASA orbit simulation software
On May 16, 1:19 pm, "Jorge R. Frank" wrote:
Joćo Gomes wrote: Hey.. Does anyone knows what programs does NASA use to simulate and predict the orbit of a spacecraft? and for simulate the reentry phase of the shutle and from now on orion? There's no one answer to the first question; every NASA center has its own trajectory analysis software. NASA does use POST quite a bit but it is not the only program used. Regarding the second question, NASA/JSC uses the Descent Design System (DDS) and Spacecraft Trajectory and Mission Planning Simulator (STAMPS) to simulate space shuttle entries. And STAMPS can be used with different vehicles? Is there any change to purchase or to have that software for a project my university is developing? |
#6
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NASA orbit simulation software
Jorge R. Frank wrote: There's no one answer to the first question; every NASA center has its own trajectory analysis software. NASA does use POST quite a bit but it is not the only program used. Boy, _that_ could never lead to a problem, could it? :-D You read that, and the Mars Polar Orbiter showing up a bit low in its approach to the planet's atmosphere isn't that big of a surprise, is it? Talk about potential misunderstandings cropping up as several separate computer programs try to figure out what something is supposed to do in detail, and all the space centers try to compare the math from _their_ individual computer program simulations. One computer program has got to be the most accurate in figuring this all out, and all NASA centers should use that one, so at least they could all be on the same page at the same time. You read something like you just wrote, and frankly you couldn't even make that sh*t up in a Monty Python sketch. Pat * i |
#7
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NASA orbit simulation software
OM wrote: ....Is there a specific reason for this, such as a NIH prejudice, God/Yahweh/Roddenberry forbid? Or is it a case as with different State agencies, some of which use Word, others still use WordPerfect 20 years after it was clusterfracked? Boy, you got me on that one also. Jorge seems to think this is all rational and normal somehow. I guess after you work for NASA for enough years, just about anything and everything would seem "rational" and "normal", or at least "SNAFU". ;-) Now, if they all standardized on "Buzz Aldrin's Race Into Space" for figuring these things out, a lot of confusion could be removed between the various space centers. :-) Pat |
#8
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NASA orbit simulation software
Pat Flannery wrote:
: :One computer program has got to be the most accurate in figuring this :all out, ... : Not necessarily, Pat. There are lots and lots of different factors involved and different simulations may be better in different areas, so that sometimes one simulation works better and sometimes another does. So there may be no 'best' one and cherry picking from each one to make a 'best' one is not a simple task. -- "The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." --George Bernard Shaw |
#9
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NASA orbit simulation software
In article
tatelephone, Pat Flannery wrote: Talk about potential misunderstandings cropping up as several separate computer programs try to figure out what something is supposed to do in detail, and all the space centers try to compare the math from _their_ individual computer program simulations. One computer program has got to be the most accurate in figuring this all out, and all NASA centers should use that one, so at least they could all be on the same page at the same time. On problem with solving something like this is that you have to test the results to see if they're correct. A good--though expensive--way to do that is to have multiple versions of the program each developed independently, and compare their results. If you solve for the trajectory you want and get three different answers, then you know you have a problem before you wreck an expensive piece of hardware. This is similar to the old "add the numbers until you get the same answer twice" algorithm we're familiar with from grade school, except a given program will always (hopefully) get the same answer given the same inputs, so you need different programs. I see another poster mentioned that different programs are good at different problems. That seems reasonable too. Mike Beede |
#10
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NASA orbit simulation software
On May 17, 9:07 am, Fred J. McCall wrote:
Pat Flannery wrote: : :One computer program has got to be the most accurate in figuring this :all out, ... : Not necessarily, Pat. There are lots and lots of different factors involved and different simulations may be better in different areas, so that sometimes one simulation works better and sometimes another does. So there may be no 'best' one and cherry picking from each one to make a 'best' one is not a simple task. Pat I think Fred's right, in my limited experience with sims. One would need 100,000's of different variables in one overall program. Just as a simplistic overview... 1) Rocket pre-launch soft/ware. 2) Rocket flight s/w, earth relative navigation. 3) Orbital s/w, earth relative with solar lunar tidals. 4) If you want to extract a LM, that's a specialized s/w sub-routine. 5) Translunar injection, to lunar orbit, is celestrial navigation. 6) Softlanding on the moon, is lunar relative, with thruster control s/w. Most of those routines need to pass data to other routines, so they end up being sub-routines, so in that sense it could be considered as one big s/w program. A problem when writing s/w is remembering what the variables stand for, for example, Pitch. Yaw, Roll, depend on the applicable spacecraft, so once (1) and (2) are done, we don't need those variables in (3), nor do we need those routines. S/w systems design and management needs to be compartmentalized into Block Diagrams, then in each Block is a Block Diagram and so forth. Regards Ken |
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