FMCW GPR Opensource

[Muerzi]

Ayone interessted to build an opensource/openhardware device that works with this principle?

For around 200-300$ MIT students build a radar that works with this principle.
http://www.glcharvat.com/Dr._Gregory...nna_Radar.html

So we need to find out the best frequenzy, LNA for increasing the tx power and make software to analyze it.
there are some fft and ifft librarys around we can use.

My goal is to create a device for around 500$

anyone interessted to join this project?
just send me a PN

[Muerzi]

nobody?

[Muerzi]

I talked to some radioamateurs. They told me that building such a device is impossible because of the small frequenzy range allowed for non hams. So legal build is not possible

[Davor]

I'm not entirely sure about this. UWB devices are regulated a bit differently, and however this device runs with continuous signal, its frequency sweeps so fast that it must qualify as UWB. I must see about the regulation. If it can't be legally used, you may consider some pulse technology instead.
Any reference to those claims?

[Muerzi]

http://www.erodocdb.dk/docs/doc98/of.../ERCRep025.pdf
page 82 SRD are mentioned (short range devices) but only with 10mW. Everything is reserved to HAM's
433.05 MHz - 434.79 MHz is not wide for chirp

Page 107 ISM band
2400MHz - 2520 MHz
unusable because of bad penetration deep

[Koala]

http://stakeholders.ofcom.org.uk/spe...xempt-devices/

[Davor]

I believe you can transmit up to the spectral density of -75 dBm/MHz just about anywhere you want, and that's the whole point of UWB.

BTW, 433.05 MHz - 434.79 MHz would make for a very narrowband chirp, and spatial resolution of such signal would not exceed ~50m. If you want fine resolution, you need LOTS of bandwidth... and it is limited to about 1GHz for physical and practical limitations.

There is a way of processing a doppler echo in a holographic way that may reveal features, but I stopped fantasizing about it when I realised the complications in the processing part.

[Muerzi]

for everyone who is still interested. here you will find the "Guide to building a GPR radar for educational use"

http://gpradar.eu/onewebmedia/TU1208...hPietrelli.pdf

[Cyruswiseman]

I visited this thread after 3 years, if anyone wants to work on it, l will be ready to cooperate with. I know something helfull about gpr

[Muerzi]

What helpful things do you know about GPR?