Block II: Computational options

Similarly to the other modules, the output is controlled by a number of one-letter options:

C

Produces a contour plot of the horizontal spatial correlation vs range. The horizontal axis, defined in Block VIII, represents the range separating the source and the array origin, while the vertical axis represents the horizontal separation (in radial direction) between two receivers. The separation and the number of separations must be given in Block IX.

D

Produces a contour plot of the intensity expectation of the scattered field vs. range and depth. The depths are defined as the depths of the sensors specified for the array in block VI, while the ranges are the ones given in Block VIII.

G

Uses a Goff-Jordan roughness spectrum as opposed to the default gaussian spectrum.

I

Creates a plot of the wavenumber spectrum of the scattered field at all depths of the receivers in the array, for a single incident plane wave with phase velocity CPH (Block V). Note that this option cannot be applied together with the reverb options C,D,R,a,r !

P

Computes scattered field assuming plane geometry. The default is an axisymmetric environment.

R

Computation of reverberant field in spatial domain. Automatically set by options C,D,a,r. Cancels options I, S, c.

S

Creates a plot of the angular spectrum of the scattered field at all depths of the receivers in the array, for a single incident plane wave with phase velocity CPH (Block V). Note that this option cannot be applied together with the reverb options C,D,R,a,r !

a

Outputs the covariance matrix for the scattered field to a direct access file with extension .xsm . The file format is described below.

c

Produces a contour plot of the scattering kernels (wavenumber spectrum of scattered field) vs. wavenumber and depth, for a single incident plane wave with phase velocity CPH (Block V). Similar to option c in OAST for mean field. Note that this option cannot be applied together with the reverb options C,D,R,a,r !

g

Same as G.

p

Uses the perturbed boundary operator for the reverberant field, i.e. the effect of loss through re-scattering is included. Yields lower bound for reverb levels. The default ignores re-scattering and therefore yields upper bound.

r

Produces plot vs. range of expectation value of reverberant field in dB for all depths of the receivers in the array.