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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. 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:
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