Parameter lists in detail:

ITERAT

Iterative

Iterative deconvolution using a modified approach by Ligorria and Ammon (1999). This is a non-linear procedure which always spikes the design trace to a single pulse and iteratively removes the strongest cross-correlations with the design trace.

Usage: ITERAT MINERR MAXITER TSTART TEND TAPER
5 parameters in this list:

MINERR

 Desired waveform error level relative to the initial
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Min value: 0
  • Max value: 1
  • Default value: 0.02

MAXITER

 Maximum numer of iterations allowed
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 100

TSTART

 Beginning of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TEND

 End of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TAPER

 Keyword indicating whether to apply a cosine taper to the windows before computing their cross-correlations
  • Format: Selection
  • Selectable Values: (codes in parentheses)
    • Taper (TAPER)
    • No taper (NONE)
  • Default value: TAPER

MITERAT

Multichannel iterative

Multichannel iterative deconvolution. NOTE: this option is experimental and not yet functional properly!!!

Usage: MITERAT MINERR MAXITER TSTART TEND TAPER
5 parameters in this list:

MINERR

 Desired waveform error level relative to the initial, with a single spike at the beginning of the main design component
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Min value: 0
  • Max value: 1
  • Default value: 0.02

MAXITER

 Maximum numer of iterations allowed
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 100

TSTART

 Beginning of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TEND

 End of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TAPER

 Keyword indicating whether to apply a cosine taper to the window before computing the inverse filter
  • Format: Selection
  • Selectable Values: (codes in parentheses)
    • Taper (TAPER)
    • No taper (NONE)
  • Default value: TAPER

11 groups of 1 REPEAT parameter per line:

DESIGN

 Component number used to design the filters, in addition to the principal DESIGN value given in list OPERAT.
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

Preceding list (ITERAT)

OPERAT

Operator

Specifies for which component of the ensemble the module builds the invefse filter and to which components this filter is applied.

Usage: OPERAT COMP DESIGN
2 parameters in this list:

COMP

 Name of an integer trace header entry distinguishing the components
  • Format: Character (8 characters)
  • Default value: Not specified

DESIGN

 Value of COMP for the component used to design the deconvolution operator
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 0

10 groups of 1 REPEAT parameter per line:

Several other components (possibly including the one used to design the operator) can be deconvolved. Their corresponding values of the header COMP are listed here.

DECON

 Value of COMP for traces that are deconvolved using the designed filter. If no values are specified, the filter will be appied to all availabe components.
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

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PREDEF

Predefined

Deconvolution using an operator supplied in a data trace.

Usage: PREDEF TSTART TEND
2 parameters in this list:

TSTART

 Beginning of operator gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Operator trace start

TEND

 End of operator gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Operator trace end

Preceding list (OPERAT)

PREDICT

Predictive

Usage: PREDICT LENGTH LAG TSTART TEND LAMBDA
5 parameters in this list:

LENGTH

 Operator length (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

LAG

 Prediction lag (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TSTART

 Beginning of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TEND

 End of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

LAMBDA

 White noise added to the autocorrelation of traces. That is, (1+LAMBDA)*AUTOCORRELATION(0)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 0.001

Preceding list (PREDEF)

SPIKE

Spiking or Shaping

Usage: SPIKE LENGTH WIDTH TSTART TEND NOISE TAPER
6 parameters in this list:

LENGTH

 Operator length (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

WIDTH

 Width of the filter output, in current time units. Values less or equal (default) correspond to spiking deconvolution
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 0.0

TSTART

 Beginning of operator design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TEND

 End of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

NOISE

 White noise added to the autocorrelation of traces. That is, a constant equal to (1+LAMDA)*AUTOCORRELATION(0) is added to all autocorrelation values.
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: 0.001

TAPER

 Keyword indicating whether to apply a cosine taper to the window before computing the inverse filter
  • Format: Selection
  • Selectable Values: (codes in parentheses)
    • Taper (TAPER)
    • No taper (NONE)
  • Default value: TAPER

Preceding list (PREDICT)

WLEVEL

Water level

Usage: WLEVEL LEVEL CUTOFF TSTART TEND TAPER
5 parameters in this list:

LEVEL

 Water level parameter
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Min value: 0
  • Max value: 1
  • Default value: 0.01

CUTOFF

 Low-pass filter cut-off (Hz)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TSTART

 Beginning of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TEND

 End of design gate (current time units)
  • Format: Trace Header (table entry), name, or numerical value (8 characters)
  • Default value: Not specified

TAPER

 Keyword indicating whether to apply a cosine taper to the window before computing the inverse filter
  • Format: Selection
  • Selectable Values: (codes in parentheses)
    • Taper (TAPER)
    • No taper (NONE)
  • Default value: TAPER

Preceding list (SPIKE)
IGeoS version 5.1
Copyright (c) 1995-2015, I.B.Morozov
Updated Wed Apr 1 21:42:11 2020