Unclassified 



SECURITY CLASSIFICATION OF THIS PAGEfWdon DbIb Entered) 



20. Continued 



errors were obtainable with repeated scannings of an artificial target array. Random errors 

 in the horizontal component of the fish-pair vector, B, were computed to be around 2.6 feet. 

 Random errors in the vertical component of B were around 7.5 feet. These errors were 

 associated with an average off-bottom distance of 70 feet and a fish-pair lateral separation 

 of 43 feet. Because of the marked sensitivity of target-elevation error to the horizontal and 

 vertical errors in B, the stereo plotting of seafloor contours could not yield useful results. 

 It is concluded that measurement of the components of B must yield errors less than 0.5 

 foot in 40 feet. It is further concluded that fish heave must be within 4 feet peak-to-peak 

 and that mutual interference effects must be absent if stereo plotting of sonar-image pairs 

 is to be performed successfully. 



Unclassified 



