ObservationTimeWindows:

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  Generate a set of observation time windows for each lat/lon target
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   Usage:
   [track,obs] = ObservationTimeWindows( orbit, targets, jD, horizon, ...
                    fOV, doPlot )
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   ------
   Inputs
   ------
   orbit      (1,6)       Orbital elements vector, OR
               (.)        Data structure w/ time (.t) and ECI pos (.r)
   targets    (2,N)       List of N targets [lat;lon] in deg
   jD         (1,1)       Julian date start epoch
   horizon    (1,1)       Duration 
   fOV        (1,1)       Field of view (deg)
   doPlot     (1,1)       Flag to generate plot (1) or not (0). Default 0.

   -------
   Outputs
   -------
   track       (.)        Data structure with time, lat and lon vectors.
   obs         (.)        Data structure array with fields:
                    .target:    (2,1)    Lat and lon coordinates of target
                    .boundary:  (2,:)    Lat/lon boundary around target
                    .nObs:      (1,1)    Number of observations of this target
                    .window: 	(nObs,2) Each row is start/stop time of window    
                    .time:      {1,nObs} Each entry is a (1,T) time vector
                    .path:      {1,nObs} Each entry is a (2,T) lat/lon vector

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Children:

Common: Coord/R2LatLon
Common: Coord/RAzToLatLon
Common: Time/JD2000
Common: Time/JD2T
CubeSat: MissionPlanning/ObservationTimeWindowsPlot
Orbit: OrbitCoord/ENUToECEF
Orbit: OrbitCoord/LLAToECEF
Orbit: OrbitMechanics/OrbRate
Orbit: OrbitMechanics/RVOrbGen
SC: BasicOrbit/RV2El
SC: Ephem/TruEarth