Yes and no: the shifting is done right; however, you should make sure to use a consistent sampling rate throughout the block. The USRP sink interprets the samples that come into it as having a sample rate of 5MS/s, whereas the nominal sampling rate in the signal sources is set to 2MS/s.
On 12/22/2014 10:45 AM, Saul E. wrote: > First of all, I want to thank you for your answer. > > Then, It is correct? (for a simple simulation of 1k, 2k and 3k Hz of > doppler shift) > > > > > Thank you. > Saul E. > > > 2014-12-22 10:26 GMT+01:00 Marcus Müller <[email protected] > <mailto:[email protected]>>: > > 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] <mailto:[email protected]> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] <mailto:[email protected]> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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