Hi
Most of the time GPR technique is used to located underground holes or buried facilities. but unfortunately the depth of penetration is between 5 to 10 meters and as the depth increases the accuracy is decreases and usually every GPR device has its own software and interpretations. I recommend to study a GPR device brochure to get more information.
Regards
MJM
i can use GPR distinguish in the geometry of the target buried, Mohamad Jamali moghadam say not true depth of penetration GPR, 1-50m depend on frequen centre antenna that use
I mean how we define form the targets buried. Circular, square, rectangle triangle, random.
We must search on the topic and also determine the physical properties of the targets buried.
i have try test some body geology with form Circular, square, but not see it,
How the frequency, depth and type of medium?
I am currently working for it. Using simulation and modeling
Dear Mr, Al Sharahi,
The answer is no, but sometimes yes.
If you want to distinguish one square of one (1) meter size, it will be very well defined if: it is up to (more or less) two (2) meter depth and you are using antenas of 400 MHz. You also can use higher frequencies (900 MHz) but the body should be more shallow (ex: 0,5 to 1,0 m).
In these above conditions (antenna frequency and depth of the body) you can EASILY distinguish if the body has one esferical or cubic form.
However, if the body is 15 meters (or higher) depth and you are using one 100 MHz antenna (Or lower frequency: 80, 50, 40, 25 Hz) IT IS IMPOSSIBLE to say the shape of the body.
Finally, the depth, the frequency of antenna, the size of the body and MAINLY the ATTENUATION of the GPR pulse in the local soil MAKES BIG DIFFERENCE to define one buried target.
P.S. I and others geophysicists in Brazil had obtained images as deep as 60 meters, however the soil is pure and dry sand on northeast of our country.
Sincerely yours,
Prof. Marco A B Botelho
Dear Gamil and dear all, please note that there more to GPR than the monostatic configuration you all appear to have in mind. So, to begin with the original question is improperly posed and could be recast as follows:
1) "Can we distinguish in the geometry of the target buried when scanning by MONOSTATIC GPR?". The answer is that any type of horizontal or subhorizontal interface can be resolved to the detail affordable by combination of host material, depth and size of the target on one hand, and the antenna frequency on the other. Right combinations allow for arbitrarilly good resolution. Conversely, vertical and subvertical interfaces cannot be resolved because they do not reflect the signal.
2) "Can we distinguish in the geometry of the target buried when scanning by BISTATIC GPR, say one used a densely spaced Common MidPoint mode?" If the combination of material, depth, size and antenna allows, the answer is generally yes we can, because in this case we receive returns from vertical and subvertical interfaces as well.
3) "Can we distinguish in the geometry of the target buried when scanning in tomographic mode using antenna arrays?". If the target is smaller than the array and the combination of material, depth and antennae allows, the answer is a definite yes.
A few forward modelling and migration exercises, preferably with FDTD and 2-D migration techniques can easily demonstrate these points.
Wish you all the best
