Relative position vector in orbital reference frame

Orekit Python Wrapper usage
2

One simple way to do it would be to convert one of the spacecraft state by overriding its attitude part so attitude is LVLH, then use the SpacecraftState.toTransform() method to get a Transform that would transform the coordinates of the other spacecraft state to LVLH.

It would be something along these lines:

  LofOffset lvlh = new LofOffset(s1.getFrame(), LOFType.LVLH);
  SpacecraftState converted =
                  new SpacecraftState(s1.getOrbit(),
                                      lvlh.getAttitude(s1.getOrbit(), s1.getDate(), s1.getFrame()));
  TimeStampedPVCoordinates pv2 = converted.
                                 toTransform().
                                 transformPVCoordinates(s2.getPVCoordinates(s1.getFrame()));
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