[Ground-station] GMAT vs. STK/HPOP - call for help

[Michelle Thompson]

Greetings Juno!

The orbit that Jan was most interested in is a HEO orbit, perigee at
1250km. The concern was over some results he was getting with the SMAD
spreadsheet and a relatively lightweight satellite.

There's another set of work that Anshul Makkar is doing that shows GTO to
Graveyard, but that so far doesn't have anything unexpected that we were
looking to run by people with more experience and additional software.

-Michelle W5NYV




On Fri, Feb 5, 2021 at 12:30 PM Juno Woods <juno at openlunar.org> wrote:

> Can you say more about the parameters? Is the satellite inserted into LEO
> or GTO or some other orbit? Is phasing needed?
>
> On Fri, Jan 29, 2021 at 5:29 PM Michelle Thompson via Ground-Station
> <ground-station at lists.openresearch.institute> wrote:
>
>> For the Debris Mitigation presentation to the FCC, we want to give
>> answers (and show our work) about how much delta-v we need for some of the
>> proposed orbits for minimum viable amateur spacecraft in the Amateur Radio
>> Satellite Service.
>>
>> There's a question that Jan King and I have about a critical altitude and
>> low surface_area:mass ratio spacecraft. It occurred to us that we really
>> might want to compare results across two or more software packages to build
>> some confidence.
>>
>> Jan has a set of results from a spreadsheet from SMAD.
>>
>> https://smad.com/
>>
>> The calculation under review is around 165km with a relatively
>> lightweight 6U spacecraft. It's acting like it wants to do some strange
>> things. Is this physics, or at a limit of the model?
>>
>> We have a couple of people who are good or are getting good at GMAT.
>>
>> https://software.nasa.gov/software/GSC-17177-1
>>
>> Question: Are the atmospheric models in GMAT good enough for this
>> calculation?
>>
>> Does anyone have access to STK/HPOP to run this calculation, for
>> comparison?
>>
>> https://www.agi.com/products/stk
>>
>> https://help.agi.com/stk/11.0.1/Content/hpop/hpop.htm
>>
>> Thank you,
>> -Michelle W5NYV
>>
>>
>>
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