Mala Mira processing in GPR-SLICE v.70

agerasiaetherealAI and Robotics

Nov 24, 2013 (3 years and 10 months ago)

458 views




Mala Mira processing in GPR
-
SLICE v.70

Addendum Manual


(update November 1, 2010
)








Mala Mira processing in GPR
-
SLICE v.70

(update November 1, 2010)


The basic processes need
ed

to use Mala Mira multi
-
channel GPR systems are briefly itemized
:

1)

Create an info file with the names of the main tracks. There are 2 ways to create this: A) using
the Create Info button

(Figure 1A) or B) Using the

Import option (Figure 1B)

and searching for
the
\
raw
\

folder of the project
.



Figure 1A. Info fil
e cr
eation of the main Mala M
ira track names using the Create Info button.



Figure 1B. Creation of the main Mala Mira track
info file
via the Import button to propagate the names
of the files

inside the
\
raw
\

folder
.






2)

Next step is to
use the standard
buttons

step
1
-


Mala Get TS followed by

step
2
-

Mira to Nav,
which generates the *.
rd3.gps files o
f the main track, and finally
step
3
-

GPS get list to update
the number of GPS listings in the information file (Figure 2).

The user can at this time use the
GPS track menu optionally to filter and condition the main GPS tracks should there be need to.


Figure 2. In the Edit Info File menu, 3 buttons are needed to generated the *.rd3.gps files of the main
Mira tracks.

3)

The n
ext operation is to extract all the radargrams from the main track names using the new
Mira Extract b
utton

in the Convert menu (Figure 3). This will make extracted radargrams in the
\
raw
\

folder with the naming convention *
-
N.rd3 where N is the channel nu
mber.


Figure 3. Individual radargrams for each antenna pair from the multi
-
plexed main track radargrams are
generated to create *
-
1.rd3 to *
-
16.rd3 filenames in the
\
raw
\

folder of the project.

4)

After the extraction to individual profiles per each channe
l, a new infochannels.dat file is
generated
containing the offset of the channel with the GPS antenna


(Figure 4). In this
configuration the separation between antennas is 0.12 and the GPS is located above channel 1.


Figure 4. Generation of the infocha
nnels.dat file.







5)

The Array to Nav button is used to generate the individual channel tracks. The calculation
includes the recorded offs
et in X and/or Y

and employs

moni
toring the track orientation
by
looking at the trend

between 2
-
3 adjacent

GPS

point
s.


Figure 5. The individual channels navigation files ar
e generated using the Array To N
av button.



6)

After this is done the user will want to apply standard signal processing such as




0ns radargram editing



Bandpass or spectral whitening

as desired



Backg
round removal (should striation/line noise remain)


Standard time slice operations can commence.


In addition, a new menu to quickly generate pulse image volumes of the Mala Mira systems

and any
multi
-
cha
nnel or non

multi
-
channel

closely spaced

data

are available

currently to just Multi
-
Channel
users

in the Radar pull

down menu (Fi
gure 6). The user must set the maximum number of grid cells in X
or Y and Z (keeping in mind the resolution they want in the volume).


A button called “Interpolate Gap”
c
an be used to fill in gaps between tracks. The Smooth button is the same as the 3x3x3 low pass 3D
volume smoother in the Grid Menu for convenience.


Figure 6. A new
(beta)
menu to compi
le the cl
osely spaced radargrams or multi
-
channel array s

into a
sin
gle


no
ninterpolated volume is availab
le using the Create Radar 3D file button.


An example of the new 3D Radargram fast pulse volume compilation menu is shown below (Figure 7)
along with its Open GL output.


Figure 7. Example of the location of the new

multi
-
channel fast pulse volume generator along with
output of the volume in Open Gl.











Examples of some imaging in GPR
-
SLICE v7.0 with the Mal
a Mira multi
-
channel GPR system through the
normal 2D time slice menus (Figure 8).



Figure
8
. Exampl
e images
from the Mala Mira system collected at Carnuntum (data courtesy of Mala
GeoScience).