tion of arrivals. output — transmission loss as a function of range 

 for up to 20 receiver depths and up to 200 range increments. 



e. b. wright 



code 8177, acoustics division 

 naval research laboratory 

 washington* d. c. 20390 



ray tracing language - fortran and 



kleRer-may 

 user lang, 

 computer - (not given) 

 (copy on file at nodc) 



A SERIES OF PROGRAMS FOR THE CALCULATION OF THE ACOUSTICAL FILlD IN 

 LONG-RANGE (SEVERAL HUNDRED TO SEVERAL THOUSAND MILES), LOW FREQUENCY 

 UNDERWATER SOUND PROPAGATION IN THE DEEP OCEAN. INVOLVES THE CALCULA- 

 TION OF RAY TRAJECTORIES, AND INTENSITY CALCULATIONS THAT ARE BASED ON 

 THE MAPPING OF RAY DENSITIES INTO THE FAR ACOUSTICAL FIELD. I/P FOR- 

 MAT FROM NODC DATA TAPES OR FLEET NUMERICAL WEATHER CENTRAL CARDS. 

 REF. 'THE HUDSON LABORATORIES RAY TRACING PROGRAM' (JUNE 1968, 363 P.) 

 AUTHORS — H. DAVIS, H. FLEMING, W.A. HARDY, R. MININGHAM, AND S. ROS- 

 ENBAUM. 



RAYTR (RAY-TRACING) LANGUAGE - FORTRAN IV 



COMPUTER - IBM 360/^4 



TRACES SOUND RAY PATHS IN A LAYERED FLUID MEDIUM. TRAVEL-TIMES, REL- 

 ATIVE TRAVEL-TIMES, TOTAL PATH LENGTHS ALONG THE RAY, INTENSITIES AND 

 THE COORDINATES OF FOCI ARE ALSO COMPUTED. THE PROGRAM IS SIMILAR IN 

 MANY RESPECTS TO H.W. DOSSO, ET AL 'RAY TRACING WITH A P6-250', TECH. 

 MEMO. 63-11 (UNPUBLISHED). THE NUMBER OF ALLOWED SOUND-SPEED VS DEPTH 

 AND BOTTOM PROFILE DATA ENTRIES HAS BEEN INCREASED FROM 32 TO 360. 

 AUTHOR — R.W. DE JEAN. DESCRIBED IN TECHNICAL MEMO. 68-5, FEb 1968. 



DEFENCE RESEARCH ESTABLISHMENT PACIFIC 

 VICTORIA, B. C. CANADA 



ORD 1 (OLMSTED RAY DIAGRAM PROGRAM NO. 1) LANGUAGE - FORTRAN 



COMPUTER - GE 225 



CONSTRUCTS ( OPT I CAl/ ACOUST IC ) RAYS IN A MEDIUM WHERE THE VELOCITY OF 

 LIGHT/SOUND VARIES CONTINUOUSLY WITH ONE COORDINATE (DEPTH). THE RAYS 

 ARE CONFINED TO A RANGE-DEPTH PLANE OF FINITE DEPTH (A LAYER) AND MUST 

 ORIGINATE FROM A SOURCE PLACED AT ANY DEPTH IN THE LAYER AND Aj ANOlES 

 OF INCIDENCE GREATER THAN AND LESS THAN 180 DEG. WHEN A RAY REACHES 

 A VERTEX (OF REFRACTION OR REFLECTION) THE REMAINDER OF THE RAy IS 

 CONSTRUCTED BY SYMMETRY AND PERIODIC EXTENSION. POINTS ARE THEN COM- 

 PUTED ALONG THESE RAYS AT INTERVALS OF EQUAL RANGE. AUTHOR — COERT 

 OLMSTED, FEB. 1965. 



WOODS HOLE OCEANOGRAPHIC INSTITUTION 

 WOODS HOLE, MASS. 02543 



ORD 2 (OLMSTED RAY DIAGRAM PROGRAM NO. 2) LANGUAGE - FORTRAN 



COMPUTER - GE 225 



SERVES THE SAME PURPOSE AS ORD 1 EXCEPT THAT THE OUTPUT POINTS ARE AT 

 EQUAL TIME INCREMENTS RATHER THAN AT EQUAL RANGE INCREMENTS AND THUS, 

 WHEN PLOTTED, WILL ENABLE ONE TO TRACE WAVE FRONTS AS WELL As RAYS. 

 THERE IS NO SYMMETRICAL OR PERIODIC EXTENSION. THE RAY PATH IS COM- 

 PUTED LOCALLY ALL THE WAY OUT TO MAXIMUM RANGE. AUTHOR — COERT OLM- 

 STED, FEB. 1965. 



WOODS HOLE OCEANOGRAPHIC INSTITUTION 

 WOODS HOLE, MASS. 025A3 



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