profile_n2 Class Reference
[Ocean Profiles]

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Detailed Description

Creates an analytic model for an N^2 Linear profile.

In this profile, the square of the index of refraction is linear. This is a useful profile because its ray paths can be computed analytically and used to test propagation loss modeling accuracy against standard benchmarks. The general form of the N^2 Linear profile is defined as:

          n(z) = c0 / c(z)
          c(z) = c0 / sqrt( 1 - 2 g0 / c0 * z )
 where:
      z    = depth below the ocean surface (negative is down).
      n(z) = index of refraction as a function of depth.
      c(z) = speed of sound as a function of depth.
      c0   = speed of sound at z=0
      g0   = sound speed gradient at z=0 (+ when deeper depths are slower).
 
References:
M. A. Pedersen, D. F. Gordon, "Normal-Mode and Ray Theory Applied to Underwater Acoustic conditions of Extreme Downward Refraction", J. Acoust. Soc. Am. 51 (1B), 323-368 (June 1972).

Constructor & Destructor Documentation

profile_n2 ( double  c0,
double  g0,
attenuation_model attmodel = NULL 
) [inline]

Default behavior for new profile models.

Parameters:
c0 Speed of sound at the surface of the water.
g0 Gradient for the square of the index of refraction.
attmodel In-water attenuation model. Defaults to Thorp. The profile_model takes over ownship of this reference and deletes it as part of its destructor.

Member Function Documentation

void sound_speed ( const wposition location,
matrix< double > *  speed,
wvector gradient = NULL 
) [virtual]

Compute the speed of sound and it's first derivatives at a series of locations.

Parameters:
location Location at which to compute sound speed.
speed Speed of sound (m/s) at each location (output).
gradient Sound speed gradient at each location (output).

Implements profile_model.


Member Data Documentation

double _factor [private]

Gradient factor = 2 g0 / c0.

double _soundspeed0 [private]

Speed of sound at the surface of the water.


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