MeasEarthChord:

Path: SpacecraftEstimation/SensorMeas

% Earth chord model for use with UKF.

   If d.angleNoise is entered it will add Gaussian noise to the angle
   measurement. If d.altNoise is added it will add altitude noise. This
   gets processed through an arc sine so is no longer Gaussian.

   Since version 2014.1
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   Form:
   y = MeasEarthChord( x, d )
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   ------
   Inputs
   ------
   x	(6,1)   State [r;v]
   d	(1,1)   Filter data structure
               .cO2Altitude    (1,1) Altitude of the CO2 layer (km)
               .angleNoise     (1,1) 1 sigma angle noise
               .altNoise       (1,1) 1 sigma altitude noise
               .rE             (1,1) Earth radius

   -------
   Outputs
   -------
   y	(1,1)	Chordwidth (rad)

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