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   Finds Doppler blind speeds.
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   Form:
   vB = DopplerBlind( fT, fR, vR, n )
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   ------
   Inputs
   ------
   fT		       (1,1)   Transmit Frequency (GHz)
   fr		       (1,1)   Pulse repetition Frequency (GHz)
   vR           (1,:)   Relative velocity (m/sec)
   n            (1,1)   Number to compute
   
                        
   -------
   Outputs
   -------
   fR           (1,:)   Pulse repetition frequency
                         
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   References:	Edde, B., Radar: Principles, Technology, Applications,
               Prentice-Hall PTR, 1995, p. 307.
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