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Notch filter - used to suppress narrowband interference against the broadband
signal background in case of overlapping signal/interference spectra. The algorithm
used here is inversed to the one used in bandpass filter algorithm.
AGC - Automatic gain control – automatic signal gain within the width of the
window in each separate trace. Used for leveling all signals in a trace. As a result, after
processing, the profile is like one shown in Fig. 11.3.
Fig. 11.3. Example of automatic gain control procedure effect.
Left - original profile; right - result.
Reverse – a procedure used for back-to-front trace rearrangement, i.e. the first trace
becomes the last one, the second trace becomes next to last, and so on. This may be
useful when any area is sounded by tacks, i.e. the first profile is covered, and then the
second is made with an offset and in the opposite direction and so on. For convenience
of subsequent analysis and interpretation of sounding data, the procedure may be used
before each even (or odd) profile.
Topography is a procedure used to restructure a profile as a function of the
sounding locality relief. Input parameters for this procedure shall be marked points
elevations (in meters). To ensure proper procedure operation, marks shall have
ascending numbering. In case of incorrect numbering or excessive marks or missing
marks, they shall have to be properly arranged by using Tools/Marks/Rebuild menu
option.
Fig. 11.5. Example of using the topography procedure.
Left-hand: initial profile; right-hand: resulting profile.
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