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Re: [Discuss-gnuradio] Doppler simulator

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Doppler simulator
Date: Mon, 22 Dec 2014 11:46:41 +0100
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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 <address@hidden>:
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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