4- 



AMPLITUDE, ANGLE, AND RANGE NOISE 



205 



Thus this phenomenon occurs in the 

 region of destructive interference be- 

 tween the two reflections, as may be 

 seen from the circle diagram in 

 Fig. 4-27, which is drawn for 

 Eb > Ea- 



In general, a target may have a 

 number of reflection centers whose 

 relative amplitudes and phases vary 

 with the instantaneous target as- 

 pect. Delano^^ has developed the 

 theory for a target composed of an 

 infinite number of statistically in- 

 dependent point sources and has determined the statistical properties of the 



Fig. 4-27 Vector Diagram for Two- 

 Target Example. 



Angle Noise vs Time from R4D at 0° 



V — 1 sec — ^ 





Angle Noise vs Time from R4D at 90' 





1 



Angle Noise vs Time from R4D at 180° 



Fig. 4-28 Angle Noise Samples for R4D. 



'9R. H. Delano, "A Theory of Target Glint or Angular Scintillation in Radar Tracking, 

 Proc. IRE^l, 1778-1784 (1953). 



