Path: Orbit/Glideslope

  Calculate delta-Vs for glideslope rendezvous. 
  For inbound glideslopes, the commanded velocity should be negative and the 
  final velocity must have a smaller magnitude than the initial velocity. For 
  outbound glidesopes the reverse is true. For circumnavigations, rTarget is 
  the radius and the vector a defines the circumnavigation orbit normal.
  This function combines the capabilities of Glideslope and GlideslopeCircumnav.
  There is a built-in demo for a 100 m separation in LEO.
  See also Glideslope, GlideslopeCircumnav, CWSimAndPlot
  [dVM, t, x] = DVGlideslope( x0, w, N, T, rTarget, vOrA )

  x0      (6,1)           Initial relative state in LVLH frame
  w         (1)           Orbit rate
  N         (1)           Number of pulses
  T         (1)           Period for glideslope
  rTarget (3,1) or (1,1)  Vector target position in LVLH frame or 
                          radius for circumnavigation
  vOrA    (2,1) or (3,1)  Commanded initial and final velocity or
                          orbit normal of circumnavigation. A normal of 
                          [0;1;0] produces an in-plane orbit.

  dVM  (3,N)   Delta-V in LVLH frame
  t    (1,N)   Times to apply the delta-V
  x    (3,N)   State at each delta-V point
 Reference: Hablani, Tapper, Bashian et al. "Guidance algorithms
            for Autonomous Rendezvous of Spacecraft with a Target
            Vehicle in Circular Orbit," 2001


Orbit: Glideslope/CWSimAndPlot
Orbit: Glideslope/ClohessyWiltshire
SC: BasicOrbit/OrbRate
Common: CommonData/SwooshWatermark
Common: General/CellToMat
Common: General/MatToCell
Common: General/Watermark
Common: Graphics/NewFig
Common: Graphics/Plot2D
Common: Graphics/PltStyle
Math: Linear/Mag
Math: Linear/Unit
Math: Solvers/NewtRaph

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