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Re: [Discuss-gnuradio] Doppler simulator

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Doppler simulator
Date: Mon, 22 Dec 2014 10:26:42 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

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.


[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.


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