GPR ManualWindows 7/10

04.2020

1. To use the GPR, we need a 12V 1.3 Ah lead-acid battery, measuring 42x52x97 mm. Connect a battery as shown in the pictures.

2. Choose the Antenna:75MHz - length-1,5m, depth-10m, resolution-1.5m100MHz – length-1m , depth- 7m, resolution-1m200MHz - length-0,5m, depth- 3m, resolution-0.5m350MHz - length-0,3m, depth- 2m, resolution-0.3m

The antenna must to be shorter than object that you will looking for.

3. Assemble and attach the antennas and USB cable as you can see on the pictures. The procedures for assembling the transmitter and receiver antennas are identical. Minimum antennas separation must to be much than antenna length. So much is antennas separation so much is depth, but antennas separation must NOT to be much than minimal depth of investigation.

4. Start notebook under Windows 7/10.5. Connect USB cable.6. Start the GPR by black switch.

Attention – do NOT touch transmit with receive antennas when the GPR is ON

7. After launching the laptop, Windows runs some background processes and updates. This makes the laptop slow and can last most often from 5 to 10 minutes. At this time, the GPR software may not function normally. Because of it, before running the software, we check theusage of the CPU and HDD on the laptop:

-for Windows 10 - simultaneously press the "Ctrl", "Alt" and "Del" buttons and select "Task Manager". The usage of the CPU and the HDD should be less than 30%, if more, you have to wait.

-for Windows 7 - simultaneously press the "Ctrl", "Alt" and "Del" buttons and select "Task Manager". Click „Performance“ next click the “Resource Monitor” and “CPU” or “Disk”. The usage of the CPU and the HDD should be less than 30%, if more, you have to wait.

8. Start the program GPRxxxx.You will see:

9. Choose the time window (time that gpr receive after transmit pulse) 50nS, 100nS or 200nS using the tab “Time nS” with the mouse. If you using tablet, choose the time window by tapping button "Time Win". For most type of soils Relative dielectric permittivity (RDP- also called the dielectric constant) is 5, and then 50nS=3m 100nS=6m 200nS=12m. Most useful is 100nS.

Material RDP Attenuation, dB/m Conductivity mS/m Velocity m/ns Air 1 0 0 0.3 Limestone 4-8 0.4-1 0.5-2 0.12 Soil 5-15 1-100 1-100 0.09 Granite 4-6 0.01-1 0.01-1 0.13 Clay 5-40 1-300 2-1000 0.06 Dry Sand 4-5 0.01 0.01 0.13 Fresh Water 80 0.1 0.5 0.033 Saturated sand 20-30 0.03-0.3 0.1-1.0 0.06

15nS = 1m

Antenna recommendation time window75MHz - length-1,5m, depth-10m, resolution-1.5m - 200nS = 10m

100MHz - length-1m, depth-7m, resolution-1m - 100ns = 4m - 200nS = 10m

150MHz - length-0,75m, depth-5m, resolution-0.8m - 100ns = 4m 250MHz - length-0,5m, depth-3m, resolution-0.5m - 50ns = 2m

350MHz - length-0,3m, depth-2m, resolution-0.3m - 50ns = 2m

10. Before setting up, raise the GPR to its working position,, the antennas must to be from 5 to 20 centimetres over the ground surface. The closer the antennas are to the ground, the greater the penetration depth. Press the button "F6" (for some new laptops and new windows to press “F6” firstly must to be hold key “Fn” , or click “Radar” and “Oscilo F6”). If you using tablet, tap button "Setup" Now the GPR working like digital sampling oscilloscope, and you will see the received pulses.

If you do not see received pulses restart the program GPR (Turn off the GPR by pressing button 1, then restart the GPR by pressing button 1, close the program GPR, and then start program GPR)

11.By pressing buttons “Z” for left or “X” for right (adjusting start point of the time window) left or right (moving the pulse) untill you can see the next picture. You can do the same if click by mouse on z and x positions . If you using tablet, tap on z and x positions .

12. Increase the received pulses by pressing buttons Q, W, E, R and T or decrease by pressing buttons A, S, D, F and G (or clicking by mouse), If you using tablet, tap on Q, W, E, R, T, A, S, D, F and G positions .

13. By pressing buttons “C” and “V” , or by click with mouse on c or v find the maximum amplitude.

14.First find the maximum amplitude of main pulse - position 1, next (it is very important) find the maximum amplitude of pulses after main pulse -position 2.

Check that when you walk with the GPR , the picture is similar.

Press the button "F6" to stop received pulses. If you using tablet, tap on “STOP”

15. Choose colour1 , colour2 or grey scale (black and white) mode. If you using tablet, tap on “COLOR”

16. Choose the sensibility (depth), in “color” mode from “Sens Color”

Press button “OK”

In “BW” or “Colour2” mode choose from “Sens BW/Colour2”

17. Choose the speed :If you will walk slow choose “Speed 1”If you will walk fast choose “Speed 2”

18.Now you are ready to start survey. Press the button "F6" to stop received pulses, if you using tablet, tap on “STOP” . To start survey press the button "Enter" , if you using tablet,tap on “START”. You can walk fast or slow. In this time you can see received part of the

radargram. In this time if You press button “M”

on the display will appear vertical black line- mark. After 60 seconds you will hear short sound "beep" - the display is fill, radargram is ready. You can save the radargram or start new if press the buttons “F6” and next "Enter".When you press the Enter key or click on "Radar," an image filter scan is started. When you click on "Radar R", scanning is started without filtering the image.

19.To stop survey press the button ‘Esc’, if you using tablet, tap on “STOP”.

20.To save the radargram in bmp file format click “File” and ‘save image as’, then write the radargrams name and press “Enter”

21.To save the radargram in GPR file format click “File” and ‘save as GPR’, then write the radargrams name and press “Enter”, If you using tablet, tap on “SAVE AS”

22. To setup colors click on “Color”, choose ‘Color1 or 2 or.......or 5 or A and with option buttons and scroll bars set colors and position of colors. To choose colors click on color. To stop press Esc. So the colors are tight so the GPR is sensitive.

23.If the led “Low Bat” is flashing , You must to change the battery .

22. If You will work on a site with high grass or bushed , use the isolation pipes

24.Problems in survey:

- If you see vertical lines similar to the next picture , you must decrease the amplifying

- If you survey under the tree similar to the next picture, you will receive

picture similar to the cavity but it is from branch not real cavity .

25.If you survey under the tree similar to the next picture:

you can receive picture similar to

To understand if this picture is from underground or it is from tree you must to make the same survey again with same direction but distance between antennas and ground surface to be 60cm

If the received picture is the same or better , it is from tree, if the received picture is poor as on the next picture it is from underground object.

- survey under the tree - distance between antennas and ground surface 20cm 80cm

If yousurvey

against a electrical wire, cable, home, fence or any big over-ground object as on the next picture:

You will receive the next picture:

If you survey against/back a electrical wire, cable, home, fence or any big over-ground object as on the next picture:

You will receive the next picture:

It is better to survey parallel to similar objects as on the next picture:

- When You survey , if you attach antennas to grass or bush You will see similar to next picture: