NAME

     ratdecon  - module to do polynomial deconvolution of seismic
     trace data

SYNOPSIS

     ratdecon [ -Nntap ] [ -O1otap1 ] [ -O2otap2 ] [  -sist  ]  [
     -eiend  ]  [  -iisp  ]  [  -pprew ] [ -citer ] [ -lplpee ] [
     -lqlque ] [ -I ] [ -V ] [ -? ]

DESCRIPTION

     ratdecon does a decomposition of  all  or  a  portion  of  a
     seismic trace into a rational polynomial:  where the numera-
     tor should contain all the reflectivity and source  function
     effects  and  the  denominator should contain all the rever-
     beration effects.  The theory is based  on  a  greenback  by
     Gutowski  & Treitel (1978, I think) and relates to the plane
     wave or layer cake earth model.  If used in conjuction  with
     minent and lsqinv this program potentially could extract the
     broadband reflectivity from plane wave data.

     ratdecon gets both its data and its parameters from  command
     line  arguments.  These arguments specify the input, output,
     the design window, the spike position of the initial numera-
     tor  guess,  and  the orders of the polynomials, and verbose
     printout, if desired.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.  This input  file  should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.

     -O1, -O2 otap1,2
          Enter the output data set names  or  files  immediately
          after typing the above key.  the -O1 entry contains all
          the numerator solutions and may be  piped  (this  entry
          may  be  left  out  with  the result that a pipe out is
          assumed).  The -O2 must be a named disk file  (i.e.  no
          pipe).

     -s ist
          Enter the start time of  the  data  window  (ms).   The
          default is the beginning of the trace.

     -e iend
          Enter the end  time  of  the  data  window  (ms).   The
          default is the end of the trace.


     -i isp
          Enter the position of a unit spike (ms).  The numerator
          polynomial  requires an initial guess so the plan is to
          start with zeroes everywhere except for a spike at time
          isp ms.  The default is 0 ms (spike at the beginning)

     -p prew
          Enter the %  prewhitening.   This  of  course  is  data
          dependent.  The default is .01%

     -lp lpee
          Enter the length of the numerator polynomial (ms).  For
          defaults see -lq entry below.

     -lq lque
          Enter the length of the  denominator  polynomial  (ms).
          Defaults:   if both lpee and lque are left off the com-
          mand line they will be set internally to the data  win-
          dow length.

     -I   Enter the command line argument '-I'  to  re-initialize
          the numerator polynomial for each trace.  Otherwise the
          numerator for the previous trace will be used  for  the
          current one.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -?   Enter the command line  argument  '-?'  to  get  online
          help.   The program terminates after the help screen is
          printed.

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.