How to get IQ samples from multiple rtl-sdr dongles in a synchronized manner?

Sdr Guru sdrguru1 at gmail.com
Mon Sep 2 09:12:31 UTC 2013


Hi

Use the IR input for synchronization.
1PPS IR pulse sender.

SG


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
>
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