6DoF Quaternion ECEF Simulink Block Issue (Theta_gmst Offset)

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Joshua
Joshua on 2 Apr 2013
Is there any way to set the initial Theta_gmst for this block? As far as I can see, the block assumes that ECI and ECEF are coincident at time = 0.
However for my scenarios (as well as pulling orbital data from TLE/EphemerisFiles/Etc) this is almost never the case. There is always some initial offset [lamda] (radians) about the 3-axis.
I've tried setting the simulation start time to the initial Theta_gmst (in seconds), but that didn't solve the problem at all.
Any ideas?

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