gpr project

[Götz von Berlichingen]

Hello.
very good question.
I dont have of 1ghz adc. I have developed a sample&hold scheme that contains radar itself, it slows down time very fast processes and displays them slowly so they can be visualized by slow adc.
This is actually a radar.

Thank you, now i can understand how its done.
Seems like it works like the NASA CRUX GPR - a smart Design.

[anto22]

nasa development has great designs and very good resolution.
but in wet soil is not allowed to penetrate and 10 cm.
Concrete and sand is great.

[unknowing]

Hello.
very good question.
I dont have of 1ghz adc. I have developed a sample&hold scheme that contains radar itself, it slows down time very fast processes and displays them slowly so they can be visualized by slow adc.
This is actually a radar.

very good question = simple question

But i like better, not so simple questions !

Can anybody explain why 8nS pulse in white ellipse is triangular ?



How sampling oscilloscope will display pulses with rise times faster than the specified rise time of the oscilloscope ?

Maybe i should ask a fortune teller?

[anto22]

pulse

[unknowing]

Pulses in attached PDFs are 500pS and ~1nS ! Your pulse is 8nS !
1nS = 1GHz, 8nS=125MHz
Each oscilloscope has limitations, maybe you use cheap chinese digital sampling oscilloscope DSO and therefore the image 8nS is triangular. Your DSO have rise time ~2nS/(all displey) , GPR must have rise time in pico seconds.

[Krzysztof]

Hi Unknowing
I am not "advocatus diaboli" but I see there nowhere the screen of oscillo.
Then the screen of monitor with their programme. They do near such excess of samples the average of signal adding up him surely and distributing what the least 1000x. To write me on side beam they can what they want. (ns)
To be visible thanks this there nowhere the disturbances of impulse nor no jitter how I in digital oscillographs of well-known firms, about clon will not remember even.
Thanks can this have resolution 8 bits.
This graph with ellipse this the current remembered in perpendicular line of programme signal. Moving slowly the line of refreshing.
Notice, that colours depend from module of value, not from sign nor di / dt.
The interesting composition of result from right screen, to be visible the thanks this the sign.
This my conclusions, I do not know system, programme nor algorithm.
I am full admiration.
Best regards Chris.

[unknowing]

Read more about UWB and PC DSO.
For low frequency demo GPR receiver (rise time 2nS / bandwidth 170MHz) is acceptable.
For quality GPR receiver must have rise time from 100pS to 400pS as you can see in the PDFs.

[Krzysztof]

Hi Unknowing.
This manual will explain a lot about how to read the data.
http://www.radsys.lv/downloads/Manual106.exe
Best regards Chris.

[mikebg]

Thanks Chris!
There is a trial version for 14 days:
http://www.radsys.lv/downloads/Prism2Trial.zip
Yours Mike-BG

[unknowing]

Hi Unknowing.
This manual will explain a lot about how to read the data.
http://www.radsys.lv/downloads/Manual106.exe
Best regards Chris.

Thanks Krzysztof

http://www.radsys.lv
The year of 1980 - the first one of Zond GPR series.
The year of 2010 - TRANSMITTER OUTPUT: 400 V

http://www.pulsediscriminator.net
The year of 2010 - first one of EASYRAD GPR
The year of 2010 - 1000 volts on the antennae

Do You Believe?

[Krzysztof]

Hi Unknowing.
As will be measured "pick to pick"
What's life when 1000V HF antenna?
Best regards Chris.

[anto22]

Thanks Krzysztof

http://www.radsys.lv
The year of 1980 - the first one of Zond GPR series.
The year of 2010 - TRANSMITTER OUTPUT: 400 V

http://www.pulsediscriminator.net
The year of 2010 - first one of EASYRAD GPR
The year of 2010 - 1000 volts on the antennae

Do You Believe?

We should post here some pictures/videos of an working oscilloscope, so finaly the non believers could believe Or just visit our website to see some vids/pics, although it is not an obligatory). As for the question about the life of the antennae, we surely don't know, because we have these GPRs working for couple of weeks now (although we develop them for an year or more). Let us answer you later about the life expectancy of the antennae.

Seeing is believing.

[unknowing]

Hi Unknowing.
As will be measured "pick to pick"
What's life when 1000V HF antenna?
Best regards Chris.

OK you invented a new measurement technology and new triangular electromagnetic waves !

[anto22]

OK you invented a new measurement technology and new triangular electromagnetic waves !

Anyone can see that that signal is not triangular, it is a bit saw-teehed, so why don't you stop being sarcastic also, there might be (unintentional, of course) a misinterpretation of the scale of the signal, anyway, this signal is a reflected signal from the earth, so it IS delayed and distorted in a way. The main point is, that the unit senses and receives signals from 15 meters depth. If there is an invention, it is surely not the triangluar signal, we refuse to claim patents on that signal (the triangular one)

[humhum]

Did this will use for RX GPR:

http://eu1cc.qrz.ru/vhf_rx/vhf_rx.htm