AbsRelECI2Hills:

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   This function takes the absolute position and velocity in the ECI frame along
   with the relative position and velocity in the ECI frame, and computes the 
   relative position and velocity in the curvilinear Hill's frame.

   Since version 7.
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   Form:
   [rH,vH] = AbsRelECI2Hills( r0, v0, dr, dv );
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   ------
   Inputs
   ------
   r0              (3,1) Reference position in ECI frame
   r0              (3,1) Reference velocity in ECI frame
   dr              (3,n) Relative position in ECI frame
   dv              (3,n) Relative velocity in ECI frame

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   Outputs
   -------
   rH              (3,n) Curvilinear Hills frame position [dR;    r1*dTheta;                   dZ   ]
   vH              (3,n) Curvilinear Hills frame velocity [dRDot; r1*dThetaDot + r1Dot*dTheta; dZDot]

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Children:

FormationFlying: Coord/GetHillsMats
Math: Linear/Dot
Math: Linear/Mag