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   Computes range and range rate measurements.
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   Form:
   [r, rRate] = RangeMeasurement( r, v, c, rSource, vSource )
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   ------
   Inputs
   ------
   r           (3,:)  Position           
   v           (3,:)  Velocity  
   c           (2,:)  Clock errors [bias;bias drift]
   rSource     (3,1)  Position of source           
   vSource     (3,1)  Velocity of source        

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   Outputs
   -------
   range       (1,:)  Range
   rangeRate   (1,:)  Range rate

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