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Jiao Xianjun putaoshu at gmail.comHi 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. 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. 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/f03c2c5b/attachment.htm>