FK5 Override

Dynamics and environment models, spacecraft model, solver algorithms, etc.

FK5 Override

Postby max » Wed Jul 23, 2014 4:45 am

Is there a way that I can turn off the PM, NUT and PREC rotations in FK5 reduction and only apply ST during propagations? I want EarthFIxed coordinates without the complicated dynamics; only include sidereal time calculations. Thanks in advance for any help you can provide!!
Respectfully,
Max
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Re: FK5 Override

Postby jjkparker » Wed Jul 23, 2014 12:15 pm

I don't know of a way to do that (easily, anyway), but other folks here might.

Off the top of my head, you might need to code the Fixed-to-Inertial conversion yourself in the script; how complicated is that without all of the nutation/precession terms? You would define your input state as variables, convert them manually, and use an inertial system throughout the rest of your script.
Joel J. K. Parker
Flight dynamics engineer, GMAT team
http://gmatcentral.org
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