Table 8-3.-Example Output of a Search Recommendation - Level I
UNCLASSIFIED
SEARCH RECOMMENDATION - LEVEL I
SEARCH TIME: 1907940800
PROB OF SUCCESS: 100.%
CUM DETECTION PROB: 100.%
SEARCH AREA RECTANGLE:
CENTER LATITUDE:
6725N
CENTER LONGITUDE:
04736W
LENGTH:
42.NMI
WIDTH:
37.NMI
ORIENTATION:
68.DEG
TOTAL AREA:
1563.SQ-NMI
SEARCH ASSET INFORMATION AND RECOMMENDATION
ASSET NAME
SPEED
ALTITUDE
SENSOR
O N S T A A R EA
COVERED
(KT)
(FEET)
(HHMM)
(%)
(SQ-NMI)
P3
200.
1000.
v
0500
100.
1563.
SAR EFFORT 0800Z 19 JUL 94
UNCLASSIFIED
. The RAY program uses a single sound speed
the deepest depth of that sound speed profile, the
profile, generated by the Sound Speed Profile (SSP)
Raytrace module extrapolates the sound speed profile to
program. Thus, sound speeds used-in this program are
a function of depth, but not range.
l In output displays, horizontal and vertical
plotting scales are often different, resulting in an
apparent difference between the angle of incidence and
the angle of reflection with respect to a locally sloping
bottom.
. A positive ray is downgoing; a negative ray is
upgoing.
l If the source is located at the surface (that is,
source depth of zero), the operator should not select any
negative (upgoing) rays.
l The module traces only outgoing rays. If the
angle of reflection from a sloping bottom is +89.9°,
then the ray is terminated.
l Computed ray diagrams are very sensitive to the
user’s selection of launch angles and source depth, as
well as bathymetry and sound speed,
l The RAY program uses the sound speed profile
to calculate ray paths. If variable bottom depths, either
automatically retrieved or manually supplied, exceed
the deepest variable bottom depth provided
. Because of computational limitations a 0° ray
cannot be traced Whenever a 0° ray is requested or
expected on the output diagram, a +0.01° ray and a
-0.01° ray will be traced.
. Because temperature and salinity are relatively
stable below 2500 m, sound speed profiles reaching
2500 m are accurately extrapolated. Extrapolations of
sound speed profiles that do not extend to 2500 m,
however, are suspect. Computed ray paths that descend
to depths where extrapolated sound speeds are suspect
should be used with caution.
FUNCTIONAL DESCRIPTION
The principle means of detection used in
antisubmarine warfare (ASW) employs acoustic energy,
Water, a poor medium for the transmission of
electromagnetic (EM) energy, is an excellent conductor
of acoustic energy or sound. Sound is a wave
phenomenon, consisting of alternate compression and
refraction of the medium. The speed of sound, or speed
at which the acoustic waves advance through the
medium, depend on certain characteristics of the
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