Hi Saul, a doppler shift is, mathematically speaking, nothing more than a multiplication with a complex sine, so use a multiply block and a signal source per simulated sattelite.
Now, you might want to update your doppler shift according to a simulated sattelite's position. I recommend having a look at PyEphem[1], which offers you calculational routines for such things, and writing your own python block[2] to generate the complex sine. Greetings, Marcus [1] http://rhodesmill.org/pyephem/ [2] http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials ; go through tutorials 1, 2, 3 On 12/22/2014 10:14 AM, Saul E. wrote: > Hi all!! > > I am developing a SDR receiver and want to simulate the doppler of > signal from several satellites. > Any suggestions? > > Signal1, signal2 and signal3 are BPSK signals and I use a USRP N200. > > > > > > Thank you very much in advance. > Saul E. > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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