Ok. Signal and sine must have the same sample rate (5 MS/s), right? 2014-12-22 11:46 GMT+01:00 Marcus Müller <[email protected]>:
> 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]>: > >> 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 >> [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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