Hello everyone,
I am having a hard time creating a visual-contact cone and a ContactLocator
within a python script that sets a mission simulation. The function is
needed there to count and measure duration of the visual contact between a
ground station and a few satellites.
For the cone, the lines
*cone1 =
gmat.Construct("ConicalFOV","conic1")cone1.SetField("FieldOfViewAngle",
70.9999)*
produce an error message:
> GMAT/R2022a/bin/gmatpy/_py310/gmat_py.py
> <http://localhost:8888/mnt/linux_storage/Software/Space_Engineering/Space_Flight/GMAT/R2022a/bin/gmatpy/_py310/gmat_py.py>
> in ?(self, *args) 7223 def SetField(self, *args):-> 7224
> return _gmat_py.GmatBase_SetField(self, *args)
> APIException: GmatBase Exception Thrown:
>
> However, a line *cone1.GetGeneratingString() *run right after it shows a
successful (?) creation of the "cone"-object:
> 'Create ConicalFOV conic1;\nGMAT conic1.Color = [0 0 0];\nGMAT conic1.Alpha =
> 255;\nGMAT conic1.FieldOfViewAngle = 70.9999;\n'.
>
>
And while it's partially possible to create a ContactLocator,
*gmat.Construct("ContactLocator",
"ContactLocator1")* and adding optional fields like WriteReport, File,
etc., I still get an error message, after running *gmat.Initialize()*:
> GMAT/R2022a/bin/gmatpy/_py310/gmat_py.py
> <http://localhost:8888/mnt/linux_storage/Software/Space_Engineering/Space_Flight/GMAT/R2022a/bin/gmatpy/_py310/gmat_py.py>
> in ?(*args) 23934 def Initialize(*args):> 23935 return
> _gmat_py.Initialize(*args)
> APIException: Event Exception Thrown: Error setting observers on
>
> ContactLocator ContactLocator1. All observers must be either ground stations
> or spacecraft.
>
>
An observer was set by
*contact_GS1.SetField("Observers", str(gsts['GroundStation_1'].GetName()))*
here, a *GroundStation_1* is one of a finite number of keys in a dictionary
*gsts* - it's a dictionary for the groundstations that would be in the sim.
I cannot figure out how to properly set this string, so that the
gmat-object *gsts['GroundStation_1']*. Tried the gmat.GetObject(
*gsts['GroundStation_1']*) and gmat.GetObject(*"gsts['GroundStation_1']*")
to no avail. Got lost both in the functions defined in the gmat_py and the
C source code while trying to determine the natures of those functions...
Would really appreciate some advice, pointers, and mentorship!
Best regards,
Mike
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