This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/osmocom-sdr@lists.osmocom.org/.
Sdr Guru sdrguru1 at gmail.comHi Are you using a common clock? http://kaira.sgo.fi/2013/09/16-dual-channel-coherent-digital.html I've modified some of the RTL dongles, played with GNURadio and Octave. The results are promising, sample level correlation (2.4M/10, FM radio signal). On Mon, Dec 30, 2013 at 9:38 AM, Jiao Xianjun <putaoshu at gmail.com> wrote: > Hi guys, > > For the multiple dongles synchronization in signal level instead of > bits/packets level, I setup a working repo in github, and write a initial > demo framework. See below: > > https://github.com/JiaoXianjun/multi-rtl-sdr-udp-relay.git > > You may find information and instruction of demo quickly by reading the > README. > > My initial purpose is performing in-fly calibration for multiple dongles > according to some pre-known signal (GSM, ADS-B?) to let them work together > coherently. > > An ideal scheme may be that we should generate a very narrow band and very > week signal in (or just located at the edge of) target working band of > dongles, and perform the software in-fly calibration in background (or > driver level). This would be user friendly. > Cheap (8USD+PP), simple, computer-controlled and legal FM band "marker" http://blog.palosaari.fi/2013/08/naked-hardware-12-usb-audio-transmitter.html I know it is far from final state currently, and many things are not clear > yet (See TODO). But please join me if you also think this is a good idea. > Just check out the demo and run it to have a look. > Testing it and I'll let you know. > Currently I just test the demo in Ubuntu-Linux. > > BR > > Jiao Xianjun > > > On Mon, Sep 2, 2013 at 8:23 PM, Sylvain AZARIAN <sylvain.azarian at gmail.com > > wrote: > >> Thanks. >> >> sylvain >> >> >> 2013/9/2 Sdr Guru <sdrguru1 at gmail.com> >> >>> The second way, use MLAT enabled dump1090 >>> https://github.com/antirez/dump1090/pull/23 >>> http://www.satsignal.eu/raspberry-pi/dump1090.html >>> >>> >>> On Sun, Aug 25, 2013 at 4:13 PM, Jiao Xianjun <putaoshu at gmail.com>wrote: >>> >>>> Hi, >>>> >>>> I want to use multiple rtl-sdr dongles to do some multi-antenna >>>> experiments. >>>> >>>> Is it possible to read IQ samples from multiple rtl-sdr dongles in a >>>> synchronized manner? >>>> >>>> I already have a glance at dump1090 codes, which is a project using >>>> rtl-sdr to decode aircraft broadcasting ADS-B messages in 1090MHz. >>>> >>>> Seems that I should use rtlsdr_read_async() instead of >>>> rtlsdr_read_sync(), because that if rtlsdr_read_sync() is used, I have to >>>> call it multiple times sequentially. That looks not synchronized. >>>> >>>> But rtlsdr_read_async() function only accept one rtl-sdr device as >>>> input parameter, and it will be blocked after it is called. So seems that >>>> it also can't be used for my purpose directly. >>>> >>>> Also welcome any opinion on how to improve rtl-sdr lib/driver to >>>> support this feature. >>>> >>>> Thank you. >>>> >>>> BR >>>> >>>> Jiao Xianjun >>>> >>> >>> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20131230/3ff30169/attachment.htm>