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NAVAL POSTGRADUATE SGRQOL 


Monterey, California 


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A COMPARISON OF TWO ACOUSTIC PARABOLIC EQUATION 
TRANSMISSION LOSS MODELS FOR COMPATIBILITY 
WITH THE WAVENUMBER TECHNIQUE IN THE 
DETERMINATION OF SOURCE DEPTH 


by 


Joe Lane Blanchard II 


March 1984 


Thesis Advisor: A. B. Coppens 


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4. TITLE (and Subtitle) 5. TYPE OF REPORT & PERIOD COVERED 
A Comparison of two Acoustic Parabolic Master's Thesis 


Transmission Loss Models for Compatibilit March 1984 


Determination of Source Depth 
7. AUTHOR(s) 8. CONTRACT OR GRANT NUMBER(s) 


Joe Lane Blanchard II PE 63785N, NORDA 


9. PERFORMING ORGANIZATION NAME ANO AOORESS 10. PROGRAM ELEMENT, PROJECT, TASK 
AREA & WORK UNIT NUMBERS 


Naval Postgraduate School N6846283WR30089 
Monterey, California 93943 on 29 APRIL £983 


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Naval Postgraduate School March 1984 
Monterey, California 93943 [oe NUMBERICr GAGES 


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17. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 


18. SUPPLEMENTARY NOTES 


19. KEY WORDS (Continue on reverae aide if neceseary and identify by block number) 


Parabolic Wave Equation, Underwater Acoustics, Implicit 
Finite-Difference, Split-Step Fast Fourier Transform, 
Wavenumber Technique, Source Depth Determination, Acoustic 
Propagation, ASW, Lloyd Mirror 


20. ABSTRACT (Continue on reverse side if necessary and identify by block number) 


mae Brock version Of the Split-Step Fast Fourier 
meensform (SSFET) and the Jeager version of the Implicit 
Finite Difference (IFD) acoustic parabolic equation models 
are compared with a Lloyd mirror interference pattern in the 
Gange domain. The SSFFT displays the inability to place the 
Peansmassion loss nulls at the correct ranges. It is also 
Baap le to utilize bottom loss information correctly. . The 


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IFD produced nulls at the correct ranges; however, it 
inserted an unaccepable amount of noise except when small 

(1 m) vertical grid steps were used and the pressure release 
bottom was placed at extended depths. In shallow water 
cases, the IFD is able to properly represent the pressure 
information. Each model is explored in the wavenumber 
domain by use of a "Wavenumber Technique" (WT) model with 
emphasis on source depth determination. The source depth 
may be determined by measuring the distance between the 
equally spaced nulls in the wavenumber representation. 
Neither acoustic model was able to provide accurate source 
depth information when the null spacings were compared to a 
known source-depth determination curve. Since the null 
Spacings were not uniformly spaced, this was to be expected. 
Some specific problem areas in the models were identified by 
the use of the WT. 


S/N 0102- LF- 014-6601 


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Approved for public release; distribution unlimited. 


A Comparison of two Acoustic Parabolic Equation 
Transmission Loss Nodels for Compatibility with the 
Wavenumber Technique in the Determination of Source Depth 


by 


Joe L. Blanchard II 
Lieutenant, United States Navy 


Berce, University of North Carolina at Charlotte, 1974 


Subarzteceds an partial fulfalinent of the 
requirements for the degree of 


MASTER OF SCIENCE IN METEOROLOGY AND OCEANOGRAPHY 
fron the 


NAVAL POSTGRADUATE SCHCOL 
March 1984 


ABSTRACT 


The BEocK version of the Splze=Step Fast Fourier 
Peanstocm (SSFFT) and the Jeager version of the Implicit 
Finite Difference (IFD) acoustic parabolic eguation models 
ace compared with a Lloyd mirror interference pattern in the 
mange domains, The SSFFT displays the inability to place the 
transmission loss nulis at the correct ranges. & 2S also 
unable to utilize bottom loss information correctly. The 
IFD produced nulls at the correct canges; however, IE 
inserted an unacceptable amount of noise except when small 
(1 m) vertical grid steps were used and the pressure release 
bottom was placed at extended depths. In shallow water 


cases, the IFD is able to properly represent the pressure 


information. Each model is explored in the wavenunmter 
domain cy use of a "Wavenumber Techniyue" (NT) model with 
emphasis on source depth determination. The source depth 


May be deternined by measuring the distance between the 
equally spaced nulls in the wavenumber representation. 
Neither acoustic model was able to provide accurate source 
depth information when the null spacings were compared toa 
knowh source-depth determination curve. Since the null 
spacings were not uniformly spaced, this was tc be expected. 
Some specific proplem areas in the modeis were identified by 
the use of the WT. 


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i. INTRCDUCTION . .. « 
If. WAVENUMBER TECHNIQUE (WT) 
Ae BACKGROUND 
Bat) PHYS PCAL PROGE'SS 
rei ACOUSTIC MODEL ANALYSIS 
A. PARABOLIC EQUATION 
Dist gt ht oe 6, 6 ye) ys 
1. Transmission 
Bloyd Mirror 
Zep pe Anda ly Sas 
Ca Le oo noose Gc 
to. 2 bans Sssion 
PAV Mirror 
Zee in Ala Ly SiS 
IV. CONCLUSIONS ete Se 


APPENDIX As: 
APPENDIX Bs; 
APPENDIX C3 
APPENDIX Ds 
fest OF REFER 
BIBLIOGRAPHY 


ENDZELAL DIS 


Sort SCURCE CODE {AT 


TABLE OF CONTENTS 


WT SOURCE CODE 


aT 


1e3) 


(LLOYD MIRROR) 


® 


Loss Comparison 


GRAPHICS SOURCE CODE 


e es s e e s 


TREE LEON LiS® .. 


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NPS) 


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LIST OF FIGURES 


PiovdewIrEoOrecconetrylGsilad. Us. 55308 «© = « 
Theoretical Lloyd Mirror Transmission Loss 
QladraburerDemodulationtof aySignal)). « « 
Example of WIE Output at 50 Hz {From Lauer, 
WIV) ceed a6 4 6% gS 5S 4 6 6h Ses See 
Source Depth Deter minatzon Curve < .« « « « 
Testor Sstit Model for Nall Spacangs . < 
Test Of SSPrT Model tor Bottom Interaction 
Ssrpe Wi Plot with Source at 500 meters . 
SSFFI WT Plot with Receiver at 1000 meters 
SSFRIAWTLP Let wathasource at S800 meters «< 
SD Me VeIOMMeCMt miss 5s) =) sis. so 6 «6 « « 
Pee anos SSLOn LOSS uss = Ww 6) 6 je =: «| “3 
Peo Weta Leds rans mLssLOn LOSS < . < « « < 
EMD NOwSelrreeertransmiSsion  LosSS S62 a2 << 
ios Shatiitiow Waternatransmission Loss .« « « 
IFD: 500 meter Source, 15 meter Vertical 
Case Sep iPmart aio! ofc =) “at ‘o) fe) 6 «)) is) es 
IDs 500 meter Source, 3.75 meter Vertical 
Erde oe ete con ieies io!) eel 96 ie) ea!) 6 @ -, a 
IFD: 500 meter Source, 0.8 meter Vertical 


Grid step s es es ad es ad ad s se ad 4 es e . e s 


ce0:) Shaltow Watecr WI, 1 meter Vertical Grid 


step e e = es e s se e e es se e es Ld . se e e. bad 


40 


41 


42 


44 


Acronyms 


AESD Acoustic Environmental Support Detachment 
of the Office of Naval Research, now 
the Numerical Modeling Division 
(Code 320) of the Naval Ocean Research 
and Development Activity (NODA). 


ASTREX Acoustic Storm Transfer and Response 
Experiment, conducted by the Naval 
Postgraduate School (NPS) in the 
northeastern Pacific during November and 
December of 1980. 


NORDA Naval Ccean Research and Development 


Rcovity at Bay St. Lours, Mississippi 


NPS Naval Postgraduate School at Monterey, 
€aia Porpiia 
NUSC Naval Underwater Systems Center at New 


Londen, Connecticut 


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Receiver Depth 

Frequeacy 

Source Depth 

Square, Roct_of.=-1 
index.of Resraction,(C.7C) 


Index in Calculations or Null 


Number in the Range Domain 

Time Independent Factor of Complex Pressure 
Distance of the Direct Path Wave 

Distance to the Image (Reflected Path) 
Source Depth 

Amplitude 

Sound Speed (C(c,Z)) 


Reference Sound Speed (@ininaum sound speed 


in water mass profile) 

Pressure Field in the Wavenumber Space 
Fast Fourier Transform 

Inverse Fast Fourier Transform 

Hankel function 

Wavenunber 

Reference Wavenumber ((G)/C ) 


Horizontal Wavenumber 


NPT 


Number of Points in the Wavenumber 


Spectrum 

Complex Pressure 

Range between Source and Receiver 
Range Increment 

Envelope function 

Envelope function (Imaginary part) 
Envelope function (Real part) 
Receiver Depth 

Source Depth 

Scaled Wavenumper 

Scaled Wavenumber Increment 
Angular Frequency 

Partial Derivative Operator 

2 ed sees 

Laplacian Operator 


Square Root Operator 


1eagrseg 


/LIcau> ego 


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Sct © wae. 


ACKNOKLEDGEMZNT 


Pewoubd Like: “to express my deepest appreciation to Dr. 
Ne Bs Coppens for his guidance in analytical processes and 
fundamentals of acousitcs. His understanding and encourage- 
Ment provided the sound basis for this research effort. Dr. 
Coppens' knowledge of the subject matter combined with the 
ability to communicate this knowledge from many different 
perspectives is a unique talent recognized his students. 

menpn Go R. Dumlap, ~ USN (Ret) was very supportive and 
Sreouraging during my entire thesis research effort. ag 
appreciate his assistance with this project and his contin- 
uing work with the Environmental Acouctics Research Group. 

mewouldy irke to” thank the personnel of the Wek. Church 
Bomputcer Center and especially Ur. D. Nac and: Mr <a 
Norton. 


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I. INTRODUCTION 
Conventional methods used to represent underwater sound 
transmission have deficted transmission loss (d3) as a func- 
eton of range in either tabular or graphical forn. Since 
the interest was in determining quantities such as range of 
bottom kounce, convergence zones, and “probabidaty of 
detection, these methods proved very satisfactory. However 
when it became necessary tc compare various underwater 
Beoustic propagation loss models with each other or actual 
in-situ experiments, they provided the analyst with less 
than adeguate insight into the causes for the observed 
errors in the various models outputs. Furthermore, interest 
has been generated in analyzing the received signal for 
information from the sound source which cannot easily be 
madauced from transmission loss as a function of range. 

One method, the Wavenumber Technigue (WT), described by 
Pens DiNapoli of NUSC [Ref. 1] and applied by Richard Lauer 
of NORDA [Eef. 2], provides more information for model 
comparisons and may have the capability of determining sound 
Source depth and range from the receiver in certain cases. 
DiNapoii used an analysis of acoustic propagation in the 
Wavenumber domain as an intermediate step in getting the 
EcanSmission loss curve in the Fast Field Program (FFP). 
Lauer studied the wavenumber domain information from the FFP 
and concluded that source localization might be vossible. 
Ee BS. Stamey [Ref. 3] investigated the potential for deter- 
Mining the source depth by using the Brock Split-Step Fast 
Fourier Transform (SSFFT) [Ref 4] parabolic eguation model 
with the "Wavenumber Technique" (WI) model. His preliminary 
investigation involved the use of isospeed and ASTREX sound 
fweed profiles with a fully absorbing botton, varied 


source/receiver combinations, and multiple freguencies. 


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The present investigation uses two acoustic parabolic 
eguation models for comparison with theoretical Lloyd mirror 
depictions, and the effects of observed inconsistencies in 
predicted transmission loss curves on the calcuiated results 
feom application of the WI model. An analysis of the sensi- 
tivity in determining source depth based on model output is 
attempted to ascertain possible use in naval operations. 

To facilitate a straight-forward analysis of the results 
and evaluation of the WT technigue for the cases studied, 
only a selected aumber of the various computer runs are 
included. Jnly those curves which best illustrate the 


effects revealed py this research are presented. 


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II, WAVENUMBER TECHNIQUE (WT) 


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A. BACKGROUND (LLOYD MIRROR) 


The WI can be elucidated with the help of the classical 
Lloyd mirror effect [Ref. 5] which describes the interaction 
between direct path and surface reflected sound signals fron 
the same continuous wave (CW) source. Figure 2.1 illus- 
trates the geometry involved in the Lloyd mirror effect. 


ees 


Figure: 2.1 Lloyd Mirror Geometry. 


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The ccmplex pressure (P) can be expressed by 


1 -j z -j u 
psa| re ae eel ha 
: (eqn 2.1) 


when ©, and rz are related by 


R= ieee aees r= R= «(d+h)* (eqn 2.2) 


with the assumption r,~1r, the pressure amplitude (p) can be 


approximated by 


Ry = ain SUS ae (eqn 2.3) 


The interaction between the direct path and surface 
reflected waves produces constructive and destructive inter- 
ference which is manifested as peaks and nulls for the in 
phase and out of phase conditions respectively. Figure 2.2 
waS produced by using equation 2.3. The null locations can 


be obtained by the relationship. 


2) ee (ns | : 
pes ———— (egn 2.4) 
9) R sin R Yy 


When equation 2.3 is expressed in the horizontal wavenumber 
domain (k,), the details of the resultant functional depen- 


dency on horizontal wavenumber yield useful information. 


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B. PHYSICAL PROCESS 


The WI is a process by which the complex pressure wave 
(with range dependent amplitude and phase) is transformed 
mmeo the spectral density as a function of the horizontal 
wavenumber. The use of the WT in the operational environ- 
ment would require a quadrature demodulation of the source 
signal to attain the complex pressure. The quadrature 
demodulation process can best be defined by the illustration 


meetigure 2.3 [Ref. 6]. 


2cos (ut) 


Acos|(w -W)t+ x] 


LP 
filter 


Asin[(w ~G)t+ x| 


-2sin (axt) 
Figure 2.3 Quadrature Demodulation of a Signal. 
When acoustic models are used to simuiate the environment, 


the requirement to perform a quadrature demodulation is 


eliminated since the complex pressure is directly 


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accessible. Eo waGtidLae yy “aGoustwe parabolic, equation 
models provide the complex envelope function (U) which must 
be multiplied by the Hankel function in order to obtain the 
complex pressure. The acoustic wave iS written in the forn 


P=UHS(k rye ut (eqn 2.5) 


where the reference wavenumrer is defined by 


Ko= - (eqn 2.6) 
and 

BeUGs, Zz) (eqn 2.7) 
is the solution to the appropriate parabolic equation. The 


complex pressure is corrected for volume attenuation and 
Fourier transformed to attain the spectral density. A plot 
displaying the results graphically with the horizontal wave- 
Humber on the x-axis and the normalized spectral density on 
the yr-axis is constructed and the spacings between the nulls 
measured. Figure 2.4 {from Ref. 2] is an example of the NT 
for a source and receiver in the same type of water mass. 
Since the Lloyd mirror field in the wavenumber domain is 


given by [Ref. 2] 


E(k) = ae elie Ze) (eqn 2.8) 


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an alternative formulation [Ref. 2], which produces evenly 
spaced nulls, is obtained by converting the horizontal wave- 


number to beta 


BsAke = ke ails 


By using beta instead of tne horizontal wavenumber, the 
distance, delta beta, between any two nulls can be used to 


ascertain the source depth by 


maze (egn 2.10) 


as illustrated in figure 2.5. 

The application for implying tne method of images, in 
isospeed cases, to describe the erfects of a perfectly flat 
pressure release boundary can be justified by inspection. 
Therefore the parabolic equation can be used to produce the 
DPoyd's mirror effect and surface decoupling 1S not an 
issue, cf. Chapter 4 of Brekhovskikh [Ref. 7]. 

When the WT is implemented, care must be exercised to 
ensure that the complex pressure contains an adequate number 
Seepoints to describe the shortest periodicity in the pres- 
Sure ficid. Phas will preclude the possibility of aliasing 
in the wavenumber domain. The ceal and imaginary elements 
of the pressure signal must be modified so that the signal 
begins and ends with zero values. Piss WOdLeLeation 2's 
hecessary because the pressure signal must represent a 
repetitive oscillaticn for the transform. The complex pres- 
Pime array is zero-filled beyond the data in order to 
gemerate an array which has the length of a power of 2 for 
eae Fast Fourier Transform (FFT). The horizontal wavenumber 


increment is generated within the computer code by 


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III. ACOUSTIC MODEL ANALYSIS 


A. PARABOLIC EQUATICN 


The elliptical wave eguation can be approximated bya 
parabolic equation (PE) when it is assumed that the envelope 
function varies slowly with range. A detailed nathematical 
@escription of the PE from an acoustic point of view is 
presented by DeSanto [Ref. 8 and 9] and a simpler but less 
general description can be found in Coppens [Ref. 10}. The 
parabolic equation has the forn 


2 
= + 2)k (LY) + (k?-KE)U =O (ean 3-1 
Z 


where it is assumed that the pressure has the form of equa- 
elon 3.2, 


Pree 2) Sp) (eqn 3.2) 


S(t) represents the primary radial dependence of the field 
in terms of an outward propagating cylindrical wave of the 
form [Ref. 4] 


(act 
Se ao ules) (eqn 3.3) 


If it is assumed that the range of interest is many wave- 
lengths from the source; then the asymptotic form of the 
Hankel function (equation 3.4) can be used [Ref. 11]. 


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Two PE models, the Brock version of the Split-Sterp Fast 
Fourier Transform (SSFFT) and the Jeager version of the 
Implicit Finite Difference (IFD) were investigated for 
compatibility with the WT in determination of source depth. 


Be SSFFT 


1. Cansmission Loss Comparison with Lloyd 


LEEOL 


— == 


To analyze sound waves in the wavenumber domain, we 
needed a model to fprovide the pressure as a function of 
range. Initially the SSFFT model [Ref. 4] was selected . 
This model generates successive values for U as a function 
of range with the helr of the algoritha 

U(rear, 2) = e@Jarke(n?-1)/2 


(eqn 3.5) 


FRalech ojark? 
e JAPK2Ke FE T(U(r 7) 


This model was a natural choice since it was the model used 
in the preliminary study dealing with the determination of 
tae source depth by the WT [Ref. 3]. However, Zt Soon 
became apparent that this model's inherent weaknesses would 
require the consideration of another nodel if ocean botton 
interactions were to be studied. These weaknesses, and 
their impact upon the WT, will be discussed shortly. 

The SSFFT is a range dependent acoustic wave model 
which, for this analysis, will be operated in a range inde- 
pendent manner. in othe xs words, only one sound speed 
profile will be used, the water mass will be assumed homoge- 
neous, and the bottom flat. TO) facriitate Che study of the 
SSFFT model, the source code of the nodel was modified to 


generate the variables required for follow-on programs to 


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Seeamstorm the pressure information and then display the 
results graphically. LA copy Or tae, source code Listing for 
Gach program is provided in appendices A, B, and C. These 


programs were then linked by Job Control Language (JCL) so 
that the WT graphics were an automatically executed. 

A ieese rina t tne SSEPL was made tor 100 (nz, 500 mn 
source and receiver depths, 0.019 km range step, fully 
absorbing botton, 2000 m water depth, and an isospeed 
profile at 1500 n/sec. These values were chosen so that a 
comparison could be made with the theoretical Lioyd mirroc 
Beansmission loss (figure 2.2). Tre output was displayed as 
a@etransmission loss curve (figure 3.1). From equation 2.4, 
meemerccation o£ null number 1 (R1)’ should be 33.33 km and 
Hib: number 2 (R2) should be at 16.67 xn. The’ SshriLr placed 
fieadt approximately 38.3 km and R2 at 17.1 kno. Since the 
model kept the frequency, source depth, and receiver depth 
constant, then this equates to a reference sound speed of 
1305 and 1462 m/sec respectively. ft 2S “apparent fhatwa’s 
the range decreases the error is reduced which indicates the 
Bossibility of a problem in the range step section of the 
model which leads te the introduction of a systematic and 
increasing deviation of the calculated sound field from that 
Meedicted by the classical Lloyd's mirror interference 
pattern. Th2 “washing out" of the interference pattern for 
Bamges less tian about 2 km is a cesult of the particular 
appeoximation of a point source used to initiate the 
program, which is tc be expected. Ratner regular fluctua- 
tions develop beyond about 30 ka; from the geometry of the 
Sase, it is plausible that this arises from interference 
with bottom reflected signals. 


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Anotner test was made using the same inputs as above except 
that the source and receiver were nmaoved to a depth of 1500 2 
({tigure 3.2). Since the half beamwidth is 2) degrees and 
fme bottom is £ully absorbing, the shortest range at which a 
Peace reflection cculd occur is’ approximately 8.2 kn; 
beyond this range, surrace reflections should be spaced in 
accordance with equation 2.4. The nulls beyond 8.2 km do 
occur at the correct ranges; however, there are slow nodula- 
tions of the overall transmission loss signal. These siow 
modulations are another indication that the bottom is not 
mally aksorbing as had been specified as input to the 


progran. 


26 


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2. kT Analysis 


ine wi. Cutpue trom the SSFFT model 1s in Eng 
units, which is a probiem when comparing different nodels. 
However, for this investigation the problem was minimal. As 
expressed by equation 2.6, the reference wavenumber for 100 
hz with a reference sound speed of 4921.26 ft/sec (1500 
msec) is 0.1277 1/ft. After correction of the reference 
wavenumber for arrange increment of 62.3 it and the 2048 
points used to represent the wavenumber spectrun, ene 
Maximum beta value should be 0.1243 1/ft which agrees 
reasonably well with the maximum beta vaiues in figures 3.3, 
3.4, and 3.5. Contrary to theory the nuils are not equaily 
Seaced and the expected delta beta vaiue of 0.00192 1yit 
(Equation 2.10) is net represented by any of the null spac- 
ings. Stamey [Ref. 3], observed tne same non-uniforn 
Spacing of beta nulls. The reason why the source depth is 
not represented by any of the nuli spacings may be traced to 
the improper null placement in the raage domaiz. The Lack 
@£ egual spacing between the nuils must be attributed to 
something else, possibly the pressure wave was improperly 
represented as a continuous Signal or numerical errors exis 
W2Zthin the source ccde. Whatever the reason for this 


difference, it must Le resolved before the SSFFI can be used 
ie 


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epth. 


with the WI to determine the source dep 


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IFD 


the IFD nodel [Rref. Az 4 which was jnstalles and 
ssted inf September 4983 at NPS [ kef- 13] was the next nodel 

hosen as a sound source for the Wide This decision “ids made 
ecause the IFD was capable of properly handling the oceab 
orton qnteractions and was the only othet Acoust Te Vee nodel 
in cresidence at NPS- a copy of the source eoae Lasting cs 
provided rel appendix De 

The IFD also presented probiens which will be 
discussed further. The same initial test ran useé with the 
SSFFT was ysed with the IFD- Since the IFD requires more 
pottom jnfornation,s addit ional pesting we- nerformed in 
order to obtain 4 fui Ly apsorbing potton. Figure 3216 LS = 
trates the environment as seen DY the IFD model. 

The densities in the water maSS,y sediments and a6 ti- 
ficial attenuatiob layer were set to 4 constant of 1.0 and 
the attenuation in the sediment was adjusted until the elim 
qnation of bottom jnterfrerence was observed. Figure 324 2S 
an example of the IFD ¢transmissioa loss output for a 500 
source/receiver depth, #@4 water depth or 2000 He an uprer 
surface of the artificial attenuation layer at 3000 , and a 
lower pressure release surface at 1G00 Gs 22° bottom atten 


fieron used to produce figure 3.7 was 0.00 16 sa/wavelengt he 


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pressure release surfaces 


Figure 3.6 IFD Environment. 


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Mmmerocation of the nulls in figure 3.7 coincide with those 
predicted by equaticn 2.4 if the higa frequency noise is 
fapereda Out by either a running average process or low pass 
d@mgatal filter. A careful examination of the transmission 
Weegee curve (figure 3.8) reveals the real problem, which is 
the long wavelength noise near tae wavelength of interest. 
fme Long wavelength noise will cause erroneous spikes on the 
Meeplots after being Fourier transiormed. Continued anal— 
Mumemeecevealcd that -the noise could be eliminated if the 
thicknesses of the artificial attenuation layer and the 
bottom pressure release suriace are chosen so that they are 
at least twice the water depth. Phe, choice of a ‘small 
Memtical grid step will reduce the thickness reguired for 
Hee pressure release surface, but this version of the IFD 
Meegram 75 limited to 5000 vertical grid points due to soft- 
ware restrictions. FLgGUre 3.9 iS ,a transmission loss curve 
Obtained from a 500 m Source/receiver depth, a 2000 m water 
Bepth, a400) wm upper level artificial attenuation layer, 
and an 8000 m bottom pressure release surface. Comparison 
mmergures 3.1 and 3.9 with the classical Lioyd's mirror 


Peansmission loss (figure 2.2) shows that the shape of the 


curve beyond 30 km is greatly improved with the IFD. The 
Mumber of vertical grid steps was 5000. When the IFD is 
used in a sShallcw water situation and at 25 Z, the noise 


Mees not appear to be present. Figure 3.10 is a plot of the 
Beagsmission loss for a signal at 25 hz, with the sou 
Beceiver depth at 50 m, the bottom sloping up from 350 t 
M, and an artificial attenuation layer and pottom pressure 
Bebease surface located at 750 and 1000 om, respectively. 
Miesnoise which was so evident in tigure 3.7 is absent fron 
the shallow w«sater case. Producing tne noise free curves 
Tequires excessive computer time except for shallow water 


Cases. 


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To reduce the amount of the pressure information and 
Wee preserve the detaiis, the IFD tests were conducted 
between 10 and 40 km in range. The reference wavenumber for 
eae test input with the [FD was 0.4189 1/m which, after 
Correcting for a range increment of 7.5 m with 4096 pocints, 
produced a beta maximum of 0.4188 1/n. Pagures. S46 11, Ss. 12, 
and 3.13 indicate agreement with the beta maximum and a 
Metta beta of 0.00628 1/m can be found among the null spac- 
ings. When the vertical grid step is reduced in size, the 
Saeout Signal contains more information of finer detail. 
The finer detailed information will, if noise is present, 
Beagduce more clutter on the WT depiction (figure 3.13). in 
Numerous WI depictions a peak was observed at the nininun 
and maximum waveaumbers. Stamey believed that the right and 
left intensity maxima corresponded to beam elevation angles 
of 0 and 30 degrees, respectively. He further stated that 
the left maxima also may be reiated to algorithmic inaccura- 
eves [Ref. 3]. The "U-shaped phenomenon" observed during 
Seamey's investigaticn of the SSFFI, is present with the IFD 


and the nulls are not equally spaced. 


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fhe reason for the "U-shaped phenomenon" appears to be 
related to noise in the envelope function field which is 
further amplified when the Hankel function is inserted to 
obtain the conplex pressure. Using a low pass filter and 
increasing the vertical grid step size appear to reduce the 
'problen. tier giTe Seo, che mulls occur at 33.30 and 33.39 
| km men a Single null should exist at 33.33 km. This condi- 
tion or noise produces the most devastating erfects by 
| masking the desired density spectrun. A narrow band pass 
| filter would probably solve this problem in the short tern 
but eventually the IFD will require further study to elini- 
Mate the noise. When the shallow case is used in the WT 
(igure 3.14), the "U-shaped phenomenon" is absent and the 
mull locations are more distinct. However, in the shallow 
Water case, the bottom interaction produces high frequency 
anterference but the null Spacings occur near the expected 


Value for the source depth (0.0628 1/m). 


43 


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HORIZONTAL WAVENUMBER 


1 meter Vertical Grid Step. 


Shallow Water WT, 


ERD 


Figure 3.14 


I¥. CONCLUSIONS 


iwo EalLabolic equation models, the SSFFT and IFD, were 
used to predict sound fields for comparison with the Llo 
Mirror interference fattern in the range domain and then in 
the wavenumber domain. In the range domain, th SSFFT 
mapEoperily handled the location of pressure nulls and 
displayed bottom interference. While these weaknesses in 
the SSFFI were absent in the IFD, the inadvertent and dele- 
terious insertion of noise was extensive. In tae wavenumber 
domain, the noise in the IFD was prohibitive in ail but the 
deep sediment and shallow water cases. The IFD produced 
results which were ccmparable with the SSFFI when the noise 
Was not a factor. The range step and the bottom attenuation 
aegorithms of the SSFFI should be reviewed in order to 
correct those problems described above. in the 25D, . the 
noise problem will require further investigation. ii tie 
problem in the iFD is not corrected, this model will be 
severely limited. With the guidance provided by Lauer 
[Ref. 2], the wavenumber domain can provide tne detailed 
information needed tO gusackiy correct inconsistencies 
observed between acoustic models. Therefore, the WT should 
be investigated further to ensure that any soitware weak- 
messes are eliminated and a thorough understazding of the 
process is assured. 

Experiments in the operational environment should be 
Planned to test the WT with actual sound sources. The ship- 
board experiment could be easily accomplished since the WT 
Can be iaplemented on micro-computers if the pressure infor- 
maewen 1S provided from an outside source. fhe WI, if it is 
going to be considered as a method to determine source 


depth, appears to have three major shortcomings: 


45 


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1. A clean CW Signal with phase information is essen- 
tial, which will require quadrature demodulation and 
extensive filtering. 

2. Prediction models are required which will provide 
equally spaced beta nulis so that software can be 
developed to automate the process. 

3. High resolution processing equipment is necessary 
because the change in beta spacing for shallow sound 


sources is small (figure 2.5). 


46 


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APPENDIX A: SSFFT SOURCE CODE (AT NPS) 


ZH 
ok=) =) 
HAsO 
HaagH4 (ro) 
cHakl a 
D> AS f Me 
Owag ta =) “oO 
ss fool @) oO fx 
eS h<w< eS my 8 ca 
VU z n Vis Ne 
HNAN z eo} a TT f& WO 
HHO O & oO mM HaeH NY 
(Qe Ee} tay Py YQ w WO Dy 
MABAH H ea) nN wv Y Hog key 
ffeopee loa fa) NO 44 = AHOOO 
Fj Aur Ay [o<] re E> a2} & OURAN M 
<s f Yas e Ay 4 Et ey by 
Aawa ~~ Oo S) am Ww YQ ica) OnavuU a 
ANZ yY=Z N YH Oo «ss HY H (=) HOR hy 
oN aD fy VU H bs » BOR ON 
= Oo Pola ° O HW H fq tH 09 Oh Ole fe (S) 
HOH s by A Q YH HH YO hy ot 4 D= A HQ mm 
(ei feo} > 4 4 ND} (4 G4 AD Ao wa NH 
foe t-—-] Up] et) e fea] Nau = & = Ae HH -OmMN © 
onHoe oz ~ 4 [7 <2 (oS) . =) Hao Awe <x 
Fey OG HY OG fo a=——AaASe = fo] H OS eH RONO > 
NO ag 4 HAHN Ne WN Zz OW AQWnetee . 
Nop) NO = ez) SSS Wany = ee mA ck, BA So 
NW He co fy AQVO 4 eof) oe = ou OHHAOHN »& nN VO 
PHS i=) Cy Ge Meqg4jyaAngeg 2zaaza De WH Om aUROZTH . 
BAHN aH A 2 Haeatg gy VU SD HS = SBM GMOHOZDWH = 
yZz=zO BH HW A aa MAHHOBAHSHGO OF He FD HAW DYHSO = 
APaAg ln el sn I ia] nN HOHOHSE UO YO BAN MHAZMQGEAGQHH= 
io] ZDHRPRHO Ga Fey eye N AH SAH EHet eee 2 
HaHMN > 2 HoD< =) T=\olo}=) BNeEDRA Om moO DHmMDAGOUNA » 
Sa HDeX<UH ARTZ 20 NE OH He BSH eZNOSNEQ & 
[atye-t—-1@) BD PMH S~NDPTAZHORO Hae <= _ = 
He PAAWHD Se BDOsO~QVaHYmDN = Ae [eo] Yn 
Soar QA AeE OF NACKMase Ww RON Ae aX Ao HH Oo N 
OORYU ZPmWD OW A QMO Dceyay Fy WO s <—28Hn00 H2 
NG FORO RA kao BwROWmk=s Ah rye=) AGAaH OF 
oH es AORHWOHUU Hon WRO H OC ARAANHy <az 
Swan ZS2Z2ZzH OF AZBZTBVZBHAzMmBA oO a oy BAA BQ 
mor aero GC WWOD HRD Pee 
ze ay meg WHO GSS Ye SQDY N ~*~ 
Hy Oc BHHH DHS QDOWHHOUGHHHAma 
Ned pafanfe-fe-t-—p >t 1b ahat csi eee Li -2 lpi 9s] hon Q Q 
ae COCO PH SP SRM ae tH atHHEe Se A [oa] ion] 
aaa tyke ry Sy SOAS HOszr & < <a 
HHHO < 1S) O 
iy oO 
WI Oys mS ee 2 z, 
RQ MN Ye aac Ps aaa! mam 
OQ Set eH ag MeNSHA el 
AHA UNH RBHOhRAMN OFS GBAQQHnVU Gz tw 
UH AAA HAR SHRSNHOURMAULUULAAZAZ UO 
x ic 
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APPENDIX B: WT SOURCE CODE 


A 
8 
ee 
4 A 
HY ey 
Q eo 
3) +s 
= ay 
fy = 
URI Ay 3S 
Hoe bad 
Hea fy a 
nN = = a) 
POD oH bd 
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Ozm = oe 
sH> o) iS 
ot H w oy ~ 
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me =) w on] 
HAO (oe) es) << o a 
ane = 4 fH ay < 
=OnWH om ee H < A 
fee] fu () jae) fy [an # = 
ORwO >) s e3) 
b4agm N is) H oa hed eo] 
ND G 7 om fac] > is oe) = 
ZnNnN& =o aH Ay ae) be ice) 
eNHD —ws Zz = “a e wn 
fo<fca ip y-] a) = a = a fy 
Ham =N e) = - io] 
uae _— for) < isa Nad Qu 
Of ea ~— fy ia) > aS Snsa=s 
H 2a oow <4 oe] isa #2 mt td 
ce Noz & (eS) = | i 3 Me amo 
wh) ONG 4 _ 7 my Tmaynww 
HRIaY NN = isa) fry fry 2.0 HROOO 
QRH — es fry a eo) Se ed Amma A 
SZOmG im = oo Ae =z AAA, 
ref il a] Omo aH ” ea) f=) ce Se OG 
om oo S Ew = Zp] =| av aT} cae ates ]ca) 
O2Z>N OHO A Ay ca) H a) So da N= 0,004 
OO ewNe = fae} em = A > AY 
aH A ~—_—n = Qu oe) = O wmawmay 
Qe agh OOH™ ia] TQ 2 MOWER 
eye) WW yO <x Q 2 ro) am WMmOonmNuHN 
OD mH oo & eq z Oy =~ tA DHA 
SO NAN AD <j < a) te A Clu omens 
masO —“~o ng Q =) n AH Ff] ay QAA 
H HM Oya s ica o) (o) tH BACCRRfA 
Ok = sO... = e id) zi So nNnwHN 
mH=Q ~~ NUN io) = << ids) i iad Aaa=pp 
QHO HOMN~NmOo nn << i) < iad BOM 
Oan RYU 0G 6 LN oa oy i) ol Rame~ DEWQHsh 
Quy y POWWaAHD OG = QQ Q HOF WHeBDooOU 
Neto HN fax{taltalta) ca) —- H ROE B@ODDZZzSm 
f@yorts> <>) SAM] 220er0 en} 4 mY Be D ROO BHNA2eC" 
weem> Sooo Son’ x =) 2 of ee] AH a we 
Bos GE HHO z- & al 2 “.H~ 
D> DH HARISTNNMNA « ell mm un ™ RAR HH KRNHH 
NHS WOO* SZBYMO id) HY WN (=| zz Qe = 
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SASARENHAAAMs YAHW ica] 
ToS DOONWH OH e 4 
Z20UD* ata) OQ hu Ww 


9 Bee HH OAH SS S 


OH # SAROHHS ON 


e4Emeé~x anus 


< KY el HH IO AGI Hy 4 


AHSqGAQUhDDRA0UANRA 


QAQ wa 
Ay ' Zee I 
PBwt ARE 
Mo, i 
NUOMNWIS SHS 
Qo ee ~ 
oom) yA 
One Et eto 
A Conyonroaes 
Wit a Ue 

SAHARA aeH 
SNONnGOZDO”~ 
OHUsAONAD VU 
mu 
oak + 
© Ka * 
MOH+ * 


+ 
* 
* 


KK 


4O 


bg >d od od 
H @ HONnnNNe 
eit Gus Ga <u ui 


= lama HN ~~ 
O™=NAHENMDM 2 


~sS el #O =e wrrnm 
SS). OS NNN eee 
Equine, 8 MQ 
tH BeHOUUNRUUYU 
DW HH eee ete 
jae) Fa Gy A Oy ey yO 
=HHH +s HRS HHO 
Oreste UOUQUI00O 
GA 
* * 
+ * Oo 
* * oO 
O O O 


nS S) 


SLOPING SECTION 


FACE VALUES ON 


OU 


45 


ELEMENTS “CN INTERFACE 


( XX 1IM(IFACE) /XX4 + XX5 ) 
(TEACEM) #YLI + U(LEFACE) *YMI + U(IEACEP) *YRI 


< 

Ll 

ise] 

fH 

rx 

= 

ea] te 

Sal = 

> > 

Ay 

= | 

e) tH 

O + Ho 
e 


SAOGMEDIN 
HU Sp 
PQaes psi i i 
PH + 
a oO teN 
1m eG epee 
H Qeroagen 
maN ORO) 
Qu tome 
2U ey Hey Ly 
OR HRB RR 
NAS aHSOOU 
* 


+ 
+ 


50 


OO 


MeteeTeal WO 2TWSHT23 KTATAN 


Soad0Srei an yesesx: 


rOg © SEU. T) 
rs 


a eee - 


FACE VALUES -ON LEVEL. SSCTION 


=Y¥RI 


ee) [oe] 
me be 
i) 
= xq 
aa wH 
Sa 
~ = 
[4 1S) 
ion | te 
Ge 
aa et 
NO =} 
Sell pn J] 
=aJ {e2] =~ 
bled = 
Bo A =~ 
Oa ma ty 
=A = 
te Lo bY 
Tess! [oar e 
Ox = * 
ea Oy 
Bo = = 
=f © — a | ica) 
Hoe BH 
[oayan) icp) = 
Beghe, i} 
xctO0O-—=z <—— 
2a EAR e124 
eee VN} >< 
= Ooh & 53) 
Oihe a) Ns 
H a1) Ted ew 
H AB HY & a 
oct Gg —t 
2O Col as Vege 
ZORN =} Zo 
Weazaam WH ive 
HOHNO HF HO 
H Of ai = 
gCHasuHqg 53 ae 
mp Ae a #O 
HH aQmm x< 
EAH ecS HY OW 


a NE ell aL Hr 
HXaetSa tHyNO 
jong avy Tt a ee a 
oe > ZO 
QONONWORHSe 
HOH WH HY Zz 
Hota sca goO o) 
DQONOzZOUO iS) 


— 

> =Shx + * 

= Oe + * 

Hy UNn+ + # 

oH 

Zee 

oO ** 

O 

oO ro) 
Wo) ~ 


SY ORONO HOY AS) 


N 
i+ 
[oa 
ea] 
oO 
= NON 
<x SQ & 
fea eS = 
on 
i= am & 
=o = = 
(oy jSe)e= 
A= We qH es 
ABH HS ee) 
AO pes <c <= AH 
He Ze © te) = 
Bem Wy La 
© Et = oO 
= =» He -_ ~~ Oy 
1 cre 
en ed <x mam wm HH 
H> We = fevy te) 
Se aS CoO KN 
eo Or RQ ek 6 fu 
Oe WOHM2ZY MY 
Y (sate) THOHO Wea 
O Bae CM esQe HR, 
GQ AA BOO Bw 
Om Met + CN GN = 
fy se Usurs " 
ial a NAOH 
ie] > ie Ao 
Pa AH GeaEm~ <u 
| fae ea icoecy Ac 
Omg AG WR GY 
NO KU AAAHY DH 
+ * Ne + 
+ * cq * * 
* * mt + te 


CO AOMOH IS) NS) NSP ONS) 


134 


Ho YN 


(CsUp.NipCk,CIWO) 
S 
S 
N 
E 
S 


SUBROUTINE TRIDG 
S 
U 
R 
19 


RETURN 
END 


UO YVVUVU VYVOUVUONVVY 


tr 


ig 


J2ZEVOYS 
ECH UOLS 


18 Hi VisewoeLiosg 


= 
“t69 
= 
oe pee 
nm om 
“4 pay fa ; 
Be a Si 
. a 
b wa = 
= 
~4 
pe 
we 
s (+ Ze, 
a 
\ ne = 
a. 


eh | 
a ad ad 
| Susie 


* 


= is) 


<a a = ° 
sole) oS He ie) 
Hes GB @®D ohn | a 
CoO2 CO De Bow = 
GWA HH wed HOR Or it 
a eS Sn Ee > =) 
e=O A O) ~ MAA ic 2) 
sD am eH OW BOnOnN © 
mam © Ot BRN H 
= j=) () GS WwW mies a& 
wn 2 Oo HON = 2D 
=a GO 4223 BMURKQS WB 
Sse © eet Ae Oa 
HOO FN =a HH ie=) 
na mW HA CO. MHS oO 
al a —] Bea FORD Ome 
aon =~ Milt AHH O io) 
OR Pe wm mH HF VO 
e HN aD OonnqnorSre x<« SC 
ae BG [e) ZzHODW ww WY 
Hof] = So OFHAnnNO wH™~ 
gQa4a> NN FW = icp) O 
a Sa Be Ho YI yQ = 
SxeDA HN NG NAShOQO = AH 
=z > AH CO BHNH HH YU 
eH 4 & Soe 
SBSsnme <maaQIio w7mm een » 
OZFPSs 2HARH UUNS BS WH Am 
QS <cAQ ecto ro) kt co) 
Sie} mW NSS HH MM © 
QOz2FSs ARHS FSH ASD MM SO 
Hem <a0gQ0 £2 ROOK 
=O) AA mn ORG 2 
Nae Sete GRR (ey fee 
foisstn Oak) ae aaa rdor = wv 
BQH HO mean 
OR =anMH O<H = - 
QNNA DPW & BSPUOzH Dn =m 
SBS HS B2HOH WB HAHWSO ON SO 
>sNS SYA ONAm HA = Oo 
HA Fee QDomO DREiNS2H es j=) 
= PSSDONnS ASZSHVONSN —/— 
MOZOOW Hw OM 2NRwHae 
ie SGA ASA GWUMHAHRO 2D 
ARPS POH OHHH ee GONNA 
24H D WAORereP2WOsRO0O SO) . 
HRSNOEQYEHHOSNM=aN ~~ 
= = ‘S) Ey = 
ea) Qe > ca] » 
maAasma aa eH SR eS 
-_ wy 
-— _ aye S=- 
=—N) => eet KS), 
~~ — — 
SA 
<2) 
4 
QQ 
HHHHHHHHHHHRHHHEHHHH = 
HH RH HR HR HR RK He HH eo) 
RHHERHHRHKHRKRHRHKH HH +H O 


YYVVVVYUYUVUVYVVVUVLUUNYU VU 


= SHO YO 
BAVA 1) 


135 


= 
S) 
Lo | 
iS) 
= 
AY 
a 
_ 
aA 
m 
=) 
nN 
NG 
3) 
<a 
fea) 
= 
oa 
je) 
iy 
Ww 
So A&W 
es Ry 
S 
= 
ES) 
Zz 
~~ 
= * 
re oe: 
= ae 


-_~ 
= 
— 
2) 
= 
a) 
wt) 
oS 
~~ 
“-_~ 
- 
+ 
_ = 
— — 
= (=) 
=z + 
— 
~~ 
oO oa) 
= - 
AH = 
[) — 
O 
~ 1 
“- 
= => 
=> » 
» bP} 
= HH 
aN UO 
==) 
ame Or) — 
eam, 
-—s I 
Wolbe 
HH —- 
m~ Was 
r=) att 
SNEDH 
oa = 
—- © 
DA O 
=) 
N 


RETURN 
END 


(C, U,N,CR, CTWO) 


SUBROUTINE TRIDL 


QO OOIN©S 


. 
sk 


seek GaREE 


4 


| = 
Qa <x 3 o— 
ea) a} xno fo) 
eS Om hoe a2 2) 
Om Om es So, =O: &) AN 
ARM <= he SN tO BA RNRAO 
HA AHHYHs> wOe Hr 
moO nS m™2a=DN HW = OQetHy 
B= Ey Or Ar~mM we A OO Het 
gAazZ ~ sD WwW WH OF wate 
Ae BUH QU a AS OnGUNS 
= QHce — ky (=) ay Oo 
He Beats eHA SB OH SON 
Ho RB li =e WY COQ BS QOUHW 
PD He sn QS UO AAS QE 
OH OHNA EBOOm, A NAaneO 
[ee] Ort ef NS HW NN AHA Wes 
MS en BW AMA BHODA eons 
DHSrHoO~ro YOO — Pb =a cc fo) 
YN OFt—OUR OHS POMAH ro) 
NHASZzza WN ee HN Ay) > U1 =) 
HHO aa mae (ea) zo wn 
Oo MW ORR Wee = ADYHO = 
io) SHH QA4Z>NnN NN ANAK UW ‘e) 
ZBAMUMRHR © eS "HHH am HN = 
OHUO AMHR DsDA MN NANaas 4 
eet i oe @) oe EIB eemH MRO YY O 


NA MOUH™ RWAHMGH ERY 2 
SS @eH4 OD SSNRDAtAQ! ARHA 
fea ico pea 29 OBONHUBHZOatt =x 
Pah atWAPam aa THOHURNH 
Hee s la | UOZN GN A & 
QDHROURBAS OSA SHAH OH2ZGHNYG 
(E> [\) 2 QASAneN aoma@) (ape 
HORBH2ARD) <HnOU OQXSNNE 
Sate HOnNRNAH UAH HOD” 
HMANt HOOP SNA ae <=] Go 
ar TNNURAARH Ea HO A = 
ONmet H NOH BHDNOHNANH 
= 4] N2HHN WAnNA DAS RAH 
(yevi?p }—-1caeclantdp )®- mi -4 <2 Fan, [@ ono 
SS FOS HSGH ANHAS GHAQHHS 
men >SHw HH HHS OQDxmO eo) 
ORS HAHHARA 2 DBAHMONSHo WY 
HO OME THMOZOMDH BH AM tke 
OUND 2b GS ON AHHRUD 
PoEOAQ OFf0 ROAM OHMGA *eMHGHAO e 
SOM IHO wee DA QNWO Se tHay= 
eS MS eee eI ZNHD ReMANO wmmaMéO 
BHORHQHHS= = HNs oS AA 
Pe BDA QHoOn Q> M<e i 
OH&POs BARE a2zmokm ma 420 
=a OOM BrPeHeaeHeoO He Owe 
me me WHD 


U (5000), CR(5000), 


I 
S 
L 
I 
U 
E 
S 
1 
2 
3 
(4) 
CCMPLEX C(5000,4), 


VUUVULULVOLOUOUULUULUUUUULYU O 


36 


) / CTWO(M) 


SUBSTITUTION 


= Chl). * C (= 1 4} 
J CTKO(NM1) 


M,4)-C (4,3) *U (M+1) 


(1,4) 
PERFORM BACK 


ORO) 
*** NOW 


RETURN 


U (N) 
END 


| 
| 
! 


aerth 


» CsA es 


on =) 
CIP tae 


’ = 


SUBROUTINE DOWN 


D IN C(t) 4) 
A 


ODN i 
OGNT LFACEZ 


QUATION AND 


by Oy Oy 


BO Ris 6 LHS OF THE & 


BLD AT RA2. 


YAO yyy 
ROU ABA 


O VYVOUVQVUVVUYU 


isa) 


RHANHN 
OAS 4 ete em XC 


12, XX 1M 
VEnv, fRizZ, 


I, 


Onr ano 


Aes SOnset 8 NN 
mod AmM NSH 8 
$= eNH BON 
WHN &OQOfTG& 
NSS Net woo 
ode NH SO TUNN 
* sOMNN sZomo ® 
QHSS we oOekmE 
SSX aDUOUNH ae 
De WNP Ss 
WN AN NETH 
ON = H=Z=HOON 
= SescN™m «8 et el 8 
SB wN|E KM wee 
OAMNANAQUO CAHORMHWM 
apes et 
me SONA BO AN 
ON Nn rKaeoet we 
MMO ee HANH RH 


1M(5000), 
RI, YRIV, YRIZ, 


XX 
ree 


y 


),cTWO(5000), 


— ONS) 
FNP EN 
eS HN 
CO-xm eee 
So wr HO 
On EN 
W Sted HN 
—s< eee 
O ~ounre 
Wax EN 
NS x oN 
am ede 
SW) PHO 
— = ON 
Oo sNN 
ON ee 


COM SN ZONN™ AHN 


hates 


BS PS PHL HO NS 8 NS PS HO 
N & & oN Heyy ogr ries & & 
AHN NHS RH HH 
SSH eR SG 
>< SDH SOPs HD 


COMMON / 
CCMAON / 


H+ tH 


CCMMON 


% HH 


tee) 


fay 


INTERFACE ELEMENT 
WATER ELEMENT, 


a 
1.0 + DR * XX 1M(IFACE-1) 


IN DIAGONAL 


426 
DIAGONAL, 


+ 


CNE ROW 


N 


lH 


+ « & 


He aH YU Il 
NUGmgAm 
Agno mes 
Onaetagie 
SHES a=so} 
BH BA 
Haz 
yy << 
ANA ww & 
AH yy AEH 


aut <a> 
AZAHALS 
We oss 
DWI HD 
x + + 
+ *- + 
a * + 
GS LOS) 


nN 
— 
x= 


[ea] 
(©) 
i?) 
Loy 
a 
ica} 
aH 
= 
HS 
f2q 
> 4 @ 
— Sr ais 
Q =a WN 
x fy 

o~ 
= YY + 
OSE AS 
ma a = 

fy it 
RQ eH N 
Alaa ed N 
Sea S) 

ning + 
Wises (U2 
Hs HH HN 
=a + a NS 
Am WW & 
Sat le eres OO 
ay FQ << 
AM1iny & 
QS SUWWWY 
mow Am" 
ae a ne 
Hem xe 
[en] ome | | | 
Eee aes 
Co} tne 
3 ON) 
eeNM eee 


ee ENON 
NO Aa Aaa 
SHVVOHOVUYO 


GWI4oaGatHotes 


TO eS ey py 


ReEAORHHROAHHH 


a 


aque 


SHAD UVUOUDVUVUYU 
Ava 


Ay ti Oa 3% * 
>UD* * 


* 
+ 


* 


3% * 
* 
* 


* 


OU O 


. a 
- QPS 
S37 Qi oses . 
= ©laes N 
» wos KH 
Q -— N BR was OG 
Zz as 82 SS) oy GaAs S = = 
<a eV) WU jaa) om Loe —_ — & 1s 2} 
Hog Seat Galesyesie nn) Wed erie UO 
arf ag ST Ca N ~ “ya O OH i <a 
OQ UNH H ce Nem OC Of Pa iy 
eH ao => AN we Oo Om fxq os 
Se BakH oa) . See 0 8 = Ea) 
GS WAaSm =ae BB mQre O 24 a ‘Sal 
(=) He -S eel ee ee ee oe) oe = 
ol aoqeq SH N Off Sm YH Mm i] KH 
; by by Ay Ly so ES SF SHO O ws ® 
BAA Sy HH “axe . _, WY = 
— OWRH Ns oA es) = NO U eo) 
i GS Woe = Mm sca ON=o Lae) eH 
BH mu. Sm wee OHNO fry ica] 
AH HoH NP SN COGN) oo fea] 
mh Woe ees YQ) SH wN YOOX Oo isa) 
. (@)y fect NOS WH AH@tGge ~~ OEE cq = 
| < HSS = BOHN GH z o) 
| Wie UUs SH FONM BIN UGS AN lama iw] 
MANOR HES =< es Oe, wom fs eo Bee 
oes. ! MN OHMORe wONnD ~ Q 
Born HxZONxM ag © SN FNM EN =) z, 
Oo Aa Gam SH 8 wx AN et OV jo) 
= Beauv SS §& &NHW MIOSIN OTe we aN 
fea > ms} WHN 8SSMOSG OC THO ON n 
Hos Se] fr) fx oy NS WN OS OHM SIN i) ia 
ep l@) oat ete ie) | SoS HNMSsI AN es OEM AN ex =m 
4S HOZza Se BNW SROTTNIN —< eee H+ fem 
OH QOH ct Il ee eOWNN wZomorsr YY NONE jan) p> 
U TAO o QHAxS ounce Osx SN ea 
Hos GH hey 9 N SSS GODOMMNHGse NeXan =m Hn nn 
Lope SHH YX WNP we CG eS Hn ce 
=O) Na cacU Pw SINGNHSRH LN P.O tw anna 
Sire HO xe OWS & Be SZHOUON 2X 8N rs <= 
Oa Sere ke SEN Ok ee ES OO ON * MH Ps 
<<} SHOUORN WG ae Nwn LNG ON we fms ee] 
HD ArHas OnMNANRaU MHOHRMHWY —m yu i tt 
Ae N MH ORL, H ese OH OC MHN RS OQLNH IN EST eon <= 
se) ee TOURRmG GMs COOH MA SOS ON NUOGU ia 
m=O ON FSW ON NHK Gea ww we Aebe eNY 
oH Oc YY NHB SHINEE N s2ZtO eG WHNHeH OGG a a 
Cathy 2WHmaa2= OANA wt em 8 NEYO OH EHO NN OYA 
HOW oY BOGHH wes SLO HY KN SPS HHO —=E_ i HOU 
ormire CO he SS NN ew ON HO oer es 8k OS Het 
ro ot PE eee ORY NNO He) ' GQ eee 
Be YY Omzzae woe ee ee YON GOH 
HFA = BORHH SPSS DR SGUGsOWOREK SD HRA Ye eae 
he) rm my NON aQOet. aoa oouU 
AHA ia) f=) ~s Ax=AHAHG 
OxsQkae > NN~wRH~-, ea) Pate ee] Zz Ay YH Oy 3 Oy et Oj Se 
NOPA& jo) Qeany 4 or © oO DNDSFTUDse 
i=) nS Oy = = = + 
+ * Ha Q eH = =a) at = + + + + 
+ * We eS) oS, o) eye) S Cn a <2 
* + jonte S| mM HRN UO Sy) U * * + + 
eH H * eFHK HK eH HH 
O UO VV0OU VUUVVVV0NO OO WOE Or te) 


38 


tniy/Onage 
‘hl 208 = 


ro) 
- 
mm N 
or N 
<t 
Ky 
am + 
fx 
Ed 
ng 
HN 
N 
z 
Oo *# 
a 
HN 
== | 
a U 
= 
J fay 
ow 
SHH 
Se fen 
boos | 
i] 
oa aa 
H 


OU YO 


SUBROUTINE SSLOPE 


Qa 
is>) => 
a] aa] LS | 
4 AY Ho 
<< =) EY EY 
AQ = OW! Om 
oH ON p= Cp) Qos 
ica] QA He fa 
Hy oS 2 =O HY) fy 
Ey OC a oo Ons 
AB 4 2 SHH 
=a MY WH Oo NO 
ON & OMAZH HS 
SHH OO & OH YN aA 
H | OnU HO 
DP HY HN BHR Ha 
eq (Bae) as ON HO 
QO © = Ames Hoi e 
Gi we YU OHYIDQ WOH 
WwW A fe 2a momo 
fa OMYH DmOWH 
za = Zid ew 
= <2) zt =O PAD 
AY GB ONY AN2AH4 
Me H KH2HN SG AO 
Oy) 1S) Sey Fecke, WR | 
= MM FSHNMN aA 
c= A Hee eH 
FPOMmm NVODO OO WO 
ABDHO AM 4H wij HH 
MHRNHSSaN GA mYDp 
(S) OH OO UHC) 
OM SANS SS hh 2aetyO 
BH ROMARO Oma mae 
AQAM2hmhORMH S22H=qGq <= 
AASAOQONSHS0OH AN> 
HY SSF DORHOUORA 
qn BQANRRAaa «aA 
SHeaSegQ4 OQOUNHANY 
HOPS ZHQRkwYH =zuUmo 
YUOUSHSZONNOWN ROH 
DORA HY 2 
WM ONMTDORNAAAGN=N 


ZOSHOW MH 4AHNA Soh 


H OmNnaD OzD 
He On ~4AHHO 
DOM NY SamMOonHEaG 


ORHAN NABH ORG 


momo aim fy IYO 
4 eee Doete ec U) PHY. 
De 
nao 

i _ ~~ -~ 
Nena + 
oom ff ° ie — — — 
fe 
Ao, 
HHHHAHHHHHHHHH HH 
Te KHRHHHR HH RHR HH 
HHH KHHHHHHHH EHS 


VOUOU9O VVVVIVOVVOVVVVOOCOV0YU 


139 


NO 

. [=o 

= ely Ps 

= © w= 

2 OGe 

» YS y 

eH ayes 
@) “= es 8 . » 
moc me a KH 
Soe SaaS oOo OS 
N Se SAS) SS CS 
tH =< N esQ GO Oo 
SG 2 BN wen YN 
— . eAein = 3 
= e%&* BS m—wWOe O = 
-S Se pel ot ee \ ae 
SH N Otaw WY Xx 
Se S&S FZHO VU Rs 
as HH “axe » » 
N »s EQ ABN WN 
mwa & WM Om ONE 
me exe ORs 
SS OH ON RSH OPS 
eee Y) BW we Mes a 
NOS 4H Hate SD 
Hes = ~§ FWYOARN GHsX 
mea NO MN Use 
<= & Qe eam es a 8 
MN OHARTAAG ~~ 
SSS OnMe en TNS 
GSA Neo & Sl 
“M8 8NH SHON OX & 
WHA Moss So aS 
WS WN SOG OHS 
SAD S oN el NSM 
<< §& BNHEOrYNN ~—< « 


* rOON ZOTmO ® UO ww 
WDASxXS ep woounme ei}i< 
ASS<aDOwNHaG Nm 
Ws eNews CU 
WSN Ser7 ew 
QMS & BHR OUOON BAT 
Be esoNl & ect el kw CO we 
He MNT NGG ON . 


QOANHANHAGO CQHOHM 
asPsP4 eQOlm MNS OM HPS 
mes Ondo Seed 
ON &NnNHR ome we 
RANKIN sZzciO ee HN 
ORNS wt ew weet ew OMY 
BPs PS PLO ey Nae SS 
N = 8 eN WH ries fe 
TCR MmRN NHS RP wh aA He 
wy eNO 
CSM DH2ZOKUGsSUURIS 


"i 


COMPLEX 
COMMON 

CCMMON / 
CCMMON / 


KHHeteHe HK HHH KH 


Ge yo CBE RN ET Bi 


7YiW 
ZZ 1 


a 


SECTION FOLLOWING A SLCEING SECTION? 
GO TO 20 


1S 2.eP 


A LEVEL 
EP. EQ. NXLES) 
CETESrakOs 1) GO TO 30 


NXLFS 


pT | 


an 


ee NO 


+e TS THIS A SLOPING SECTION2 
i Pow 


50 


CALL LEVEL 


*%**x LEVEL SECTION FOLLOWS A LEVEL SECTION 
GO TO 


OV0YV 


4 
HO 
cate) 
fy 
Psa 
Hee 
GBH A = 
Ei 
eft a | ! wm 
= is] > 
wy YU ~ 
a> «6S 
Oo + 
= mw ob 
Oo aoa ~ => 
MH <x = s 
a AEs <= x 
UO HO x aN 
52] Dawns = 
Y GN! 3a) Fa 
we] +H OU 
&) 220 = x 
= mORGmAY 
Loon] oO (=\-> | 
Ay Ays© Veber 
e) mBO+-rW = 
YQ —aQn qe = 
A OHO < ey 
joa Taree, Q x mH 
a HOSBMN—YU 
nA . se | 
MN BwNBoy ope fen 
= Ho SG * Som 
Oe Fiz eee mb eS 
i O ee G&G INI 
BH NAA Ie A 
ON WHOA his 
Ho yOosaHyo Ry 


+ 
AHsSHONKN>S SUH HHH 
ZXMZNOR mS DHOHmENMNN 


DG(C,U,N, CR,CTWO) 


= CHA eS wt BHHONH 
Bw WER See He 
Hea NA DOOUO GY 
ORND BSH tage 
et HR <SRy H HYO 
NAN & RRR Om eee) 

Aue By eg an=SaQeTmO at 
APay= DPAmHHDULUNLVUO 
al a) 
> + + * + & 
xe + * * * oO 
H+ + + +* + Oo 
* 
* 
* 

eS) w 

N N 
KAKO) KONO) O O .S) 


140 


fr] 

A= 

dp) i= 
& HOA, 
= [ayes \les) 

my Ay 
= OH 
isa) GHW 
= Aye <t 
f wOU 

<q 
sa _——— 

U Wa 
<x Gee 
a] oo 
OG Shy 
Zaid Flee 
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LIST OF REFERENCES 


Naval Underwater Systems Center Technical Report 4103, 
Fast Fieid Program for the Multilayered M2dia, by F.k. 
DiNapotzi, 26 June 197 7T. 


Naval Underwater Systems Center Technical Memorandua, 
Signal I[ransmission in tae davenumpber Domain, by Re 
Tauer, 5 June W793. 


Stamey, 3.B.,  P2reliminary Investigation of the 
Environmental Sensitivity or Acoustic Signal 
TransGisSion in the Favenumoer Domain with Respect TS 
ones Bees Determination, Naval Postgraduate School, 
Decemrer T3982- 

Naval Ocean Research and Development Activity 
Teconical Note 12, The AESD Parabolic Equation Model, 
Hoke SEOCK, January, 1973 

Orficer, C.B.-, | introduction to the Theory of Sound 
Transmission | with “Application to “the ~ ocean, 
MGGEaAW-hLIL; S58. 

Buckner, "§se of calculated sound fields and 


He P. 
matched-field “detection to locate sound sources in 
Shallow water, " J. AGCOUSTE. » 90C. “Ame,  V- 295. Dis 
366-373, February 19706. 


Brekhovskikh L.M., Fundamentals of Ocean Acoustics, 
Springer-Verlag, New York, 139362. 


Desanto, J-A., “Relation between the Solutions of the 
Helmholtz and Parabolic Ejuations £or. sound 
pepe dees on,” Wet AGOMNSte SOC. Alc, Vs O25 Pe 295-297, 
Auguse 1977. 
DeSanto, JeAs, Zap ics in Current Physics: Ocean 
Acoustics, Springer-Verlag, 19795. 
Coppens, . A.B., AR VERtEoducGtion to the Paraboiic 
Ejuation for Acoustic Propagation, Naval Postgraduate 
School Technical Report, NPSOT=335-002Z, November 1982. 
Kinsler, L-E&., Frey, A.R., Coppens, A.B., and Sanders, 
:V-, Fundamentals of Acoustics fTaird Edition, John 
Wiley and Sons, 19982. 


Padet acy  paravortc BgQuatLon, by wen sceerand TG. 
eas, 27 May 1982. 


147 


a 


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LADS YRIST Sei UF eid Epos 
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2 £8 et mie 
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~ ‘ oJ 
t re 
* r ' 


a * . ) 
A 
it eos sazE 
iy Jeo a 14 
- * bo uo? SeteG 
: af Agi a 


Sie 


JacgeL,. E. Cc er 2 a 2 
Parabolic ua S 2B It te 2ECEe 
solution “detno Phcorporatias Exact —- {nts S 
Conditions, Naval Postgraduate School, September 983. 


148 


eas 79"" 4 loc 


BIBLIOGRAPHY 


Pammssten, RoA., “Low-frequency surtace interference effects 

in long-range sound PEO eds et Obs Jc) AGCouUStT. Soc. Al., V- 
peepee 76-683, January 1 31. 

Brigham ES0.4., Lhe? fast OUrZer Transform, Prentice-Hall 

ine., 1974. ae 

PuGekeetak., SuUcChaL;GRSNs, cand Spoftford, C.W., "Modifying 
Piece sounde Speed) Profile to improve the Gcuracy of the 

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and Applicatiogns, John Wiley andmsons, 0977 = 

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January 1980. 


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Naval Undersea Center Technical Report TP 488, Low-Frequency 
Propagation Efrects for Sources or Reclievers Near the Ocean 
ce y.S.AlS "Pedersen, D.F. CObGOn. © and De. Whawe, 


mlm 


ULL reo ae: 

eptember 1975. 

: : Donald, Mechanics of Underwater Noise, Pergamon Press, 
ELC Water Sound, Second Edition, 


Gere k, Rade; 


4 lon in the Sea, Derense Advanced 
Research Proj 


149 


a od 


(98 ial rt | 


10. 


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