looking for home-made G.P.R.

sampler

So the sampler is a sample and hold stage?
Also you use the methode of equivalent time
sampling? Only on sample per transmitted Puls
is converted by ADC? And the repition frequency
is determined by the conversion rate of ADC in
the PIC?

Best regards
Dirk

[Valchev]

Actually that is similar to PC based digital sampling oscilloscope high (or ultra-high) bandwidth. As an example GPR 'ZOND 12' have sampler with only 4 transistors, and is perfectly. I use different circuit with bandwidth > 5GHz.

sampler?

Hi

Could someone explain what kind of electronic realizes the "sampler"?
The only thing I can imagine is a kind of delay-line (SAW) like in chirp-radar.
What kind of electronic is able to spread a signal 100k in time without degredation.

Dirk

[aft_72005]

Hi Valchev
Thanks for your diagram.
I hope you have very happy new year.

[Valchev]

Hi Valchev

Please up loade block diagram and how it works .

In picture seem as you used transmiter and receiver in vhf band .

Home-build GROUND PENETRATING RADAR
http://georadar.150m.com/
http://m12.hit.bg/gpr_eng.html
http://m12.hit.bg/gpr.html

Block diagram

weil...

the server is to slow - post the picture here!

weil...Server kostenlos ist.Und ist problemlos nur von Bulgarien zu beobachten.
Wenn das Geraet so arbeitet wie URL....

[Valchev]

Interesting project. I read gfarquharson_thesis.pdf, if I don't make mistake, this is radio frequency spectral analysis (profiling). If you interesting from spectral analysis survey, see to commercial project producing from "GEOPHYSPROGNOS", it is spectral seismic profiling, I disignd similar system, but result in soil is bad.
http://www.newgeophys.spb.ru/en/index.shtml

May be of interest!

http://rrsg.ee.uct.ac.za
http://rrsg.ee.uct.ac.za/theses/theses.html

See G. Farquharson
--------------

Alan Langman
A.R. Isaacson
M.K. Cope
C.F. Zietsman

Alan Langman, Simon Dimaio, Brian Burns, and M.R. Inggs. Develop-
ment of a Low Cost SFCW Ground Penetrating Radar. In Proceedings
of the IEEE 1996 Geoscience and Remote Sensing Symposium, vol-
ume IV, pages 2020–2022, May 1996.

[Valchev]

Home-build GROUND PENETRATING RADAR
http://georadar.150m.com/
http://m12.hit.bg/gpr_eng.html
http://m12.hit.bg/gpr.html

GPR cross section of the ground structure and photos:
terrain - before digging
terrain - after digging
terrain - after digging, with light brown layer, from 1 to 2 meters deeply

[schatzsucher]

@admin:
can you delete post #27. i can´t open the 3. page.

[Valchev]

Hi aft_72005,
To us transmiter and receiver in vhf band is impossible, if you have time to losing, try. For block diagram and how it works search internet, there have plenty of information.

[aft_72005]

Hi Valchev

Please up loade block diagram and how it works .

In picture seem as you used transmiter and receiver in vhf band .

[Valchev]

Home-build GROUND PENETRATING RADAR
Тry http://georadar.150m.com/

[Valchev]

Home-build GROUND PENETRATING RADAR
The order of pictures according to position is:
First - 1
1. example 2, 3
2. example 4, 5, 6, 9
3. example 7, 8
End - 10

The order of pictures is:
First - gpr001
1. example - gpr002.jpeg , gpr003.jpeg
2. example - gpr004.jpeg , gpr005.jpeg
gpr006.jpeg , gpr010.jpeg
3. example - gpr007.jpeg , gpr008.jpeg
End - gpr009.jpeg

[Valchev]

Home-build GROUND PENETRATING RADAR