PING «21 



TIME : 1985/177/159/8/71 

 MAX. AMPL..-873 



Figure 2. Acoustic backscatter return pulse for a typical Sea 

 Beam ping. The envelopes recorded on the center beams 

 (7 & 8) are narrow and high amplitude, while the 

 outer beams are successively delayed in time due to 

 longer travel paths. 



76 



