This is awesome. How did you analyze the data ? Is the software/source (both grc setup and data analysis) available ? Mark
On 25/09/13 23:23, Juha Vierinen wrote: > I hooked up my dual coherent channel rtl_sdr dongle into two of our > passive radar antennas that we have here (log-periodic antennas > pointing North and South). After fine tuning gains and signal levels, > I acquired some FM radio data (WWLI 105.1 MHz). To my surprise, I got > passive radar echoes from airplanes when I analyzed the data. Passive > radar is one of the most challenging types of radar because the > requirements for dynamic range are larger than those for eg., pulsed > radar, I really didn't expect much from my test. > > I expect the $16 system to also be able to see specular meteor echoes > (typically stronger than airplanes) and ionospheric field aligned > irregularity echoes. Not bad for something that required about > $10k-$100k investment in a digital receivers ten years ago, and a $2k > investment yesterday. > > Visually, the rtl_sdr dongle system has a little bit more noise than > the usrp n200 with a tvrx2. And also, there is the hassle of aligning > samples. So I would still use the usrp if given a choice, as it does > perform better and requires no hacking. > > Here is the passive radar video I just made using my $16 dual channel > rtl_sdr (the timestamp is broken, but I just did the measurement an > hour ago): > http://youtu.be/KRqtqtCVRR0 > > For comparison, here is an example passive radar video of airplanes > and specular meteor echoes done using a usrp n200 + tvrx2. This was > earlier, so the targets aren't the same: > http://youtu.be/-k2ZuhAz0ac > > Does anyone know who manufactures these dongles, or who designed it? > > PS. I ordered a seven port usb hub, in anticipation of adding more > coherent channels (to do interferometry and maybe imaging). It seems > that every time I browse ebay, I end up ordering a few dongles. > > juha > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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