see LIII INTERFEROMETRISCHES SONAR | 
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Fig. 1: Geometry of Pattern Generation 
By mixing the received echo-signals of both transducers a fringe pattern 
image like fig. 2 is produced. If the path difference of the sound wave 
is an integer multiple of the signal wave length the resulting signal 
gets reinforced otherwise it is extinguished. This happens several times 
in an image line and leads at last to such an interferometric image. 
  
Fig. 2: Interferometric Sonar Image