Hello, I need to communicate with the USRP and receive data like these :
2015-06-02 02:32:29.246055 center_freq 1000775000.0 freq 1000718750.0 power_db 5.59449106566 noise_floor_db -121.702764103 2015-06-02 02:32:29.246138 center_freq 1000775000.0 freq 1000725000.0 power_db 5.80020853614 noise_floor_db -121.702764103 2015-06-02 02:32:29.246236 center_freq 1000775000.0 freq 1000731250.0 power_db 6.41043187666 noise_floor_db -121.702764103 2015-06-02 02:32:29.246343 center_freq 1000775000.0 freq 1000737500.0 power_db 5.72799835886 noise_floor_db -121.702764103 2015-06-02 02:32:29.246443 center_freq 1000775000.0 freq 1000743750.0 power_db 8.61943426588 noise_floor_db Regards Abdeslam *Abdeslam Bourkane* On 1 June 2015 at 22:36, Abdeslam Bourkane <abdeslam.bourk...@gmail.com> wrote: > 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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