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<p>Image  theory  is  an  ideal  method  for  calculating  the  transmission  loss  in  a  shallow  water  (wedge  shaped  ocean)  environment.  It  can  be  used  in  cross-slope,  at  all  frequencies  and  in  transitional  cut  off  regions  that  are  out  of  bounds  to  normal  mode  theories.  This  thesis  had  three  objectives:  1)  convert  the  existing  image  theory  models  called  URTEXT  and  WEDGE  into  a  high  level  scripting  language  called  MATLAB™  by  Math  Works,  2)  linearize  the  existing  quadruplet  expansion  program  to  increase  speed,  and  3)  to  incorporate  the  Arctan  approximation  of  the  Rayleigh  reflection  coefficient  into  the  quadruplet  expansion  for  the  fast  bottom  case.  Objective  1  was  completed  with  accurate  results.  Objective  2  was  completed  with  a  factor  of  8  increase  in  speed.  Objective  3  incorporated  the  Arctan  approximation  of  the  reflection  coefficient  for  a  fast  bottom  into  the  quadruplet  expansion,  but  due  to  the  inaccuracy  of  the  reflection  coefficient  after  the  second  quadruplet,  the  results  were  not  favorable.  It  was  also  discovered  that  even  with  the  Rayleigh  reflection  coefficient,  the  first  order  approximations  made  in  developing  the  quadruplet  expansion  equation  (Equation  6-27)  are  not  accurate  enough  for  the  fast  bottom  case.
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<br>Subjects: NA</div>
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Takamiya, Patrick Toyoki</div>
Internet Archive identifier