GPR - project

[pillar2012]

Funding

Basically it comes down to money. I need money for funding the project that I stated above. I would also try to build a system that would specifically find gems better. However, I need funding. Unless I have money to do this, it won't happen. Not enough time or resources because let's be honest...you have to eat and pay your bills.

If anyone knows of funding or ways to get funding for a project like this I am all ears.

Thanks.

[epitopios]

GPR - project

hi to all friends in the foroum,
even i am a radio amater for many years ( the hobby is a passion) I read this forum over a year because of a friend he is a treasure-hunter for some years,
I made for him a gradiometer , it works very well , it shows undercover metallic over 15 meters , even i didnt believe that this kit will work, in the next days , we will make the data logger .
SO its my first time writting here.
I found something interesting about G.P.R. an article in this site:
http://www.cwc.oulu.fi/same2005/same.pdf
I hope it helps the philosophy of the sport
friendly epitopios

[epitopios]

GPR - project

Anoter interesting article about : Development of an Utility Finding Impulse Radar
Is here : http://www.ndt.net/article/ndtce03/papers/v076/v076.htm

Also Impulse Radio Books
Is here : http://www.tinaja.com/books/bkimrad.asp


Also Short range micro-power impulse radar with high resolution swept range gate with damped transmit and receive cavities
Is here: http://www.delphion.com/details?pn=US05774091__

And of course , if you are an radioamater , see antennas for very high frequencies
http://www.dxzone.com/catalog/Antennas/WiFi/

[Aziz]

Oh yes,

you remembered me to my 2.4 GHz WiFi antenna developments last year. It was quite interesting to get an internet access through several km's downtown. Here is one of my several developments: a high gain 21 dbi franklin antenna.

model source: http://mitglied.lycos.de/pp4nec2/files/index.html

Aziz

[epitopios]

G.P.R. project

sometime in the past , about 2006 , seeker and Leto were writing about G.P.R. and the frequency 0,9-3GHz.
I found an interesting site for radio amaters at: http://www.wimo.com/framesetp_e.html
Where you can find transmitters , receivers,modules, antennas for those UHF frequencies and also many other interesting things.
Have a look ,it might good for your research
Friendly epitopios

[epitopios]

GPR - project

Seeker wrote Jun 2006

....The helical antena have many advantages to another types and rotating polarization give us 20dB attenuation between TX and RX signals in straight reception. ....

I dont disagree but also have a look at:
http://www.rozendalassociates.com/datasheets/HORN.pdf

[miki73]

Are somebody know gpr working principe?
Gpr firs transmite signal and then recive..like pi detector,
or contnious transmit and recive,in that case how transmit signal not blind reciver?

Regards!

[gwzd]

GPR usually works with two antennas, one transmitting and one receiving. The pulses are extremely short compared to the range of investigation. For instance, consider a 100ns (yes, that's right, nanoseconds) range with a 500MHz antenna. The pulse width is approximately 2ns or only 2% of the desired range. And, yes, it is the strongest one and therefore often damped at some extend. In transceivers which has the same antenna transmitting and receiving more advanced techniques are used, but that is out of the scope of this forum.
I guess this helps.
RA

[gwzd]

Here is one of my several developments: a high gain 21 dbi franklin antenna.

model source: http://mitglied.lycos.de/pp4nec2/files/index.html

Aziz

why is it called a Franklin Antenna? I propose from now on we call it an "Aziz antenna"! I'll have to correct that in my books!
RA

[miki73]

Thank you!Now i have clearly picture.

Regards too all!

[miki73]

One more question if im not borring.How that work in situacion with 4.transmither in corner of quad scaned place.This transmiters is sincronius with reciwer too or that method work on some other way?

[gwzd]

Multichannel gpr systems work in several different ways:

1. can be multiplexed, so no tx/rx pairs work simultaneously
2. can be one antenna transmitting and all the other receiving.
3. can be firing in a sequence, that is alternating, but still no multiplexing like the SIR-20 from GSSI which is a true dual channel unit.
4. can be with directive antennas like 3D Scan from Norway.
5. probably many others more that I just don't know about

Regards,
RA

[Aziz]

why is it called a Franklin Antenna? I propose from now on we call it an "Aziz antenna"! I'll have to correct that in my books!
RA

Probably because someone, whose name is Franklin, did probably invent this type of antenna array.
http://www.centurion.com/home/pdf/wp_omni_wireless.pdf

See on page 1 figure a)

This antenna is optimized for 2.4 GHz for an impedance of 200 Ohms. You need a balun to change its impedance into 50 Ohms (WLAN).

I have a prototype of this antenna and it is working well (for WLAN). But probably not convenient for a GPR project.

If the reflector is reduced (removing the wings), it could give still a good directional antenna. But then, the antenna has to be recalculated (optimized).
Something like this:
http://www.electronicsinfoline.com/T...adiation.shtml

These antennas are also called "Amos" in the web:
http://www.qsl.net/yu1aw/engl.htm
http://www.qsl.net/yu1aw/amos_article.pdf
http://www.qsl.net/yu1aw/invertamos.pdf

This was not my invention. So there is no need to alter your books.


Aziz

[gwzd]

Probably because someone, whose name is Franklin, did probably invent this type of antenna array.
http://www.centurion.com/home/pdf/wp_omni_wireless.pdf

Really?! no kidding?

See on page 1 figure a)

This antenna is optimized for 2.4 GHz for an impedance of 200 Ohms. You need a balun to change its impedance into 50 Ohms (WLAN).

I have a prototype of this antenna and it is working well (for WLAN). But probably not convenient for a GPR project.

you've got no clue how a gpr works, do you?

This was not my invention. So there is no need to alter your books.


Aziz

Oh! thanks for that! I was already starting to worry!
RA

[bajes2008]

enough is enough seeker

Dear seeker maybe you're a fan of Electronic Engineering, or perhaps be an engineer ... but most of all, you are good at drawing attention and attention. Maybe this is one of the hobbies as well .. but this does not give you the right to manipulate the members of this forum and ridicule them and laugh at them .. it a disgrace .. and I can say with confidence that all members of this forum are enthusiasts for gold traders, but not as claimed by .. and say you will not be published here .. if your design to what all the fuss if it does not? Better to be published here on your site and your friends and not .. and you know that not everyone is supposed to be knowledgeable in electronic engineering in order to build the device you .. or is it the question of individual muscles to the needy members?? If .. I advise you to stop this farce .. and enough is enough.