I used the X310 internal 10 MHz reference for lack of a signal generator, but the GNSS-SDR couldn't it track this data. Now that I got a signal generator I will try on Monday in the lab to provide the reference externally. I don't use grc nor labview because the daughterboard in the X310 doesn't support uhd. I am strictly using uhd and uhd python APIs. When I turn on the X310 I don't have any signal coming out of the REF OUT port. I found the command <$uhd_usrp_probe --args addr=192.168.10.2> would send the internal reference to the REF OUT port in the rear panel of the X310 such that I would connect a cable there to the REF IN port of my daughterboard. Do you know what is a good uhd command I can use or argument with the one I am using if you know it to make sure the X310 is putting out on the REF OUT port the external signal is receiving in the REF IN?
Also, do you know what uhd command I would use if I have a GPSDO plugged in? I had one but now is misplaced. Someone took it from the lab but I am still hopeful I will find it. I may attend to use grc in windows because I have it installed but I believe I will encounter problems with data rate. Currently I am only using python uhd APIs in linux to digitize and transfer the data from the X310 to the linux machine. Also, a colleague in another facility collected data from the X310 and the custom daughterboard using labview and labview USRP APIs at 3 different rates 2.5 MSPS/5 MSPS/10 MSPS but only 30 seconds of data each. Again the GNSS-SDR couldn't track it but 30 seconds may not be enough. Another colleague in another facility collected GPS data using a R&S RTSA and successfully track it and got NAV data with the GNSS-SDR. However, my job is to evaluate the custom board as GPS receiver. Chugging it along .... I wish I had more support and understanding about the GNSS-SDR works. It is not clear to me how some output information change when I change some of the inputs in the GNSS-SDR configuration file and so on. I am very grateful for your support and your help will be always appreciated. Sincerely Luz Elena (Luchi) Florez Manduca (formerly Roth) R&D Electrical Engineer US Army Armament Research Development & Engineering Center Precision Armaments & Intelligent Sensors Division Munition Sensors Branch RDAR-MEF-P, Bldg 407 Buffington Road, Picatinnny Arsenal, NJ 07806-5000 Desk 973-724-6618 Cell 267-884-9517 New Home 267-247-5839 luz.e.florezmanduca....@mail.mil -----Original Message----- From: Marcus Müller [mailto:marcus.muel...@ettus.com] Sent: Friday, December 14, 2018 11:54 AM To: Florez Manduca, Luz E CIV USARMY (USA) <luz.e.florezmanduca....@mail.mil>; usrp-users@lists.ettus.com Subject: [Non-DoD Source] Re: [USRP-users] GPS data acquisition with the X310 All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. ---- Hi Luz, nice seeing you again! So, as discussed before, I've made a custom VM image just for you (reminder: it's at [0]) including GNSS-SDR and all the drivers you'd need. I'm a bit surprised you haven't tried to simply use it, following GNSS- SDR's tutorial (the first page I think I've saved to the desktop of that VM image), to receive GPS! You don't need a GPSDO clock to receive GPS. I'm confident the available documentation that I've linked to and the explanations, especially given your specific deviations from standard equipment, given during our extensive email conversations will allow you to work your way through this. Best regards, Marcus Müller [0] Caution-http://marcus.hostalia.de/LinuxForGNSS-SDR.ova [1] Caution-https://gnss-sdr.org/conf/ On Thu, 2018-12-13 at 21:34 +0000, Florez Manduca, Luz E CIV USARMY (USA) via USRP-users wrote: > Can any of you point me in the right direction in how to collect good > GPS data with the X310 whether using the X310 internal 10 MHz > reference, or external 10 MHz reference or GPSDO clock, depending on > which one will work? How to use the PPS port with any of these choices > and so on. > > Thank you very much. > > Sincerely. > > Luz Elena (Luchi) Florez Manduca (formerly Roth) R&D Electrical > Engineer US Army Armament Research Development & Engineering Center > Precision Armaments & Intelligent Sensors Division Munition Sensors > Branch RDAR-MEF-P, Bldg 407 Buffington Road, Picatinnny Arsenal, NJ > 07806- > 5000 > Desk 973-724-6618 > Cell 267-884-9517 > New Home 267-247-5839 > luz.e.florezmanduca....@mail.mil > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > Caution-http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
