Dear Marcus, I thought too differents forums I posted the same question at the same time. OK let's continue here this is my reply :
*Hi,* *@Marcus : Yes I have already the formulas ad now trying to implement in C++. The problem I have is I need the output from the "USRP source" as number for instaance and then apply formuas and again show it in time axis. I will go back again to the s first chapter maybe I miss something.* *@Sylvain : Yes that's true from the "USRP source" I need the value as a dBm or dB. The calibration part will do it after getting the value from the source then I will derive the attenuation from noise within formuals. I already did the link budget need just now to values from the source.* *Thank you and best regardsAbdeslam* *Abdeslam Bourkane* On 1 June 2015 at 18:19, Marcus Müller <marcus.muel...@ettus.com> wrote: > Dear Abs, > > you've asked this question on discuss-gnuradio and already got two answers. > In case you've missed those, and to avoid that people tell you what you > already know: > > Sylvain wrote that, due to a large number of factors contributing to what > you see as digital amplitude, you will need to calibrate yourself, using > exactly the system you want to use to measure power: > > You mean you want the signal power as a dBm value ? > > Just won't happen ... Too many things in the chain, you'd have to > calibrate it for a specific freq / board / gain / temp / phase of the > moon / ... > > > And I explained that if you have a mathematical representation of how your > estimator works, you might be able to write a custom estimator block for > both of your values of interest: > > > I assume you already have definite formulas that define the estimator for > these two numbers. > Unless you can directly "click together" that estimator in GRC, you will > most likely have to implement it. > In many cases, doing this in Python is rather easy (especially if you come > from a python or matlab background), > so I'd recommend reading at least the first 3 chapters of > https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials > > > If these answers didn't help you out, I think it would be wise to explain > what these answers are lacking, instead of just re-posting the same > question. > > Best regards, > Marcus > > > > > On 06/01/2015 06:17 AM, Abdeslam Bourkane via USRP-users wrote: > > Good evening, > > I will appreciate your help and guidance. since 3 weeks I'm trying to > implement an application > to derive the sky noise and attenuation from a beacon satellite signal. > Using gnuardio and USRP2 (Ettus N210) I'm able to receive the and see the > beacon signal at a defined frequency (FFT plot). What I need is write an > application in python or C++ that allow to me to retrieve and plot the > skynoise and attenuation values. > The problem I have is when using the blocks in gnuradio how to retrieve > the signal power so then I can use a math formulas to derive both > attenuation and skynoise and then plot them again in new graph to show them? > > I would appreciate any help from your side. > > Thank you and best regards > > *Abs* > > > _______________________________________________ > USRP-users mailing > listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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