Next: Execution of OASSP
Up: Block II: OASP options
Previous: Block VI: Receivers
This block specifies the wavenumber sampling in the standard OASES
format, with the significance of the parameters being as follows:
- CMIN:
- Minimum phase velocity in m/s. Determines the
upper limit of the truncated horizontal wavenumber space:
- CMAX:
- Maximum phase velocity in m/s. Determines the
lower limit of the truncated horizontal wave-
number space:
In plane geometry ( option P ) CMAX may be specified as
negative. In this case, the negative wavenumber spectrum
will be included with
kmin=-kmax, yielding correct
solution also at zero range.
- NW:
- Number of sampling points in wavenumber space.
In contrast to what is the case for OAST,
NW does here not have to be an integer power of 2. The sampling points are placed equidistantly
in the truncated wavenumber space determined
by CMIN and CMAX. If CMAX<0, i.e. the inclusion of
the negative spectrum is enabled, then the NW sample
points will be distributed along the positive
wavenumber axis only, with the negative
components obtained by symmetry. NW=-1 activates
automatic wavenumeber sampling.
- IC1:
- Number of the first sampling point where the
calculation is to be performed. If IC1>1,
then the Hankel transform is Hanning-windowed in the
interval 1,2IC1-1 before
integration. Insignificant for automatic sampling (NW
= -1).
- IC2:
- Number of the last sampling point where the
calculation is to be performed. If IC2<NWN,
then the Hankel transform is Hanning windowed in the
interval IC2+1,NW before integration. Insignificant for automatic sampling (NW
= -1).
- IF:
- Frequency increment for plotting of
integration kernels. A value of 0 disables the plotting.
Automatic wavenumber sampling
As foor the other OASES modules the automatic sampling is activated by
specifying the parameter NW to -1 and it automatically activates
the complex frequency integration contour even though option O
may not have been specified. The parameters IC1 and IC2 have no
effect if the automatic sampling is selected.
Next: Execution of OASSP
Up: Block II: OASP options
Previous: Block VI: Receivers
henrik schmidt
1999-08-25