@Echulion, just a side note I thought of as I was replying to this post.
If you want a moving ground FoV, you could also keep the FoV pointing towards Z direction (Vector3D.PLUS_K) and use the Frame attribute of GroundFieldOfViewDetector to implement the motion.
Frames are by design meant to move with time, by using a TransformProvider that will give you, at a given date, the Transform between the frame and its parent (a TopocentricFrame in the ground FoV case).