please I am interested, if you allow me I want this code On Wed, Jul 28, 2010 at 4:39 PM, Juha Vierinen <jvier...@gmail.com> wrote:
> Hi, > > I recently wrote some preliminary code to see if a USRP2 could be used > as a wide band ionosonde receiver (FM CW ionospheric chirp sounder). > Sure enough, after a morning of programming I managed to create a > simple ionosonde receiver using the following set of hardware: USRP2, > GPSDO, LFRX and a wide band magnetic loop antenna. I'm listening to > ionospheric echos to a transmitter located about 1 km away from the > receiver, which is transmitting a 0.5 MHz/s sweep from 0.5 MHz to 16 > MHz every minute. I simply request the USRP2 to start sampling with a > 20 MHz bandwidth at the correct time (we have written a sampler that > allows you to specify in unix time when to start sampling). These > files are then analyzed using a simple R script that produces the > following type of an ionogram (see attached file). > > The next step would be to program the analysis part in C so that it > would be possible to track multiple ionospheric chirp sounders > simultaneously. I can release the code if somebody is interested > building their own wide band ionosonde receiver. > > I also recently finished work on a beacon satellite receiver similar > to the GNU digital beacon receiver that Mamoru Yamamoto has done. The > program allows you to measure relative total electron content (line > integrals of electron density) between a satellite and a receiving > station. We are planning to build a ionosopheric tomography receiver > chain using USRP hardware and the software is written wit h this in > mind. The program is C++ and allows tracking of multiple simultaneous > beacon satellites. If there is interest, I can also release this code > too. The software should work with a generic USRP and two WBX > daughterboards. > > BR, > juha > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- Thanks.....
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